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Chovancová K, Michalides NM, Košlabová M, Končálová M, Halko R. Green direct ultrasonic slurry sampling and electrothermal atomic absorption spectrometry method for metal analysis of solid plastics samples. Anal Methods 2024; 16:990-1002. [PMID: 38269410 DOI: 10.1039/d3ay02116e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
This work presents a "green" analytical method developed for the determination of potentially toxic metals such as aluminium, barium and chromium in solid plastics samples using the slurry sampling technique in conjunction with electrothermal atomic absorption spectrometry. The development of the slurry sampling technique in conjunction with electrothermal atomic absorption spectrometry entailed optimisation of the measuring conditions, which included optimisation of the temperature programme, selection of an appropriate liquid medium for slurry preparation, optimisation of the concentration and volume of the liquid medium and optimisation of the mass of the solid plastics sample. The following conditions were determined: the optimal pyrolysis temperature for aluminium, barium and chromium was in the range of 1300 °C to 1700 °C and the optimal atomisation temperature was in the range of 2100 °C to 2400 °C. The optimal liquid media for solid plastics samples were H2O, 0.2% (v/v) HNO3 and 0.2% (v/v) HCl. The optimal volume of liquid medium was in the range from 5 to 15 mL and the mass of the solid plastics samples was in the range from 30 to 100 mg. The limit of detection and limit of quantification were estimated as 0.06-0.52 ng g-1 and 0.22-1.69 ng g-1 for aluminium, 0.11-0.94 ng g-1 and 0.37-3.14 ng g-1 for barium and 0.07-0.31 ng g-1 and 0.25-1.04 ng g-1 for chromium. Relative standard deviation was below 5% for all plastic samples analysed. Based on the established validation parameters, the slurry sampling technique in conjunction with electrothermal atomic absorption spectrometry represents a viable technique for metal analysis of a variety of plastic materials. The concentrations of analytes in individual solid plastic samples were in the range of 1.36 ± 0.06 μg g-1 to 22.65 ± 0.66 μg g-1 for aluminium, 1.13 ± 0.03 μg g-1 to 6.01 ± 0.22 μg g-1 for barium and 0.60 ± 0.03 μg g-1 to 10.48 ± 0.46 μg g-1 for chromium.
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Affiliation(s)
- Katarína Chovancová
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovičova 6, Mlynská Dolina, 842 15 Bratislava, Slovak Republic.
| | - Nicolas Milan Michalides
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovičova 6, Mlynská Dolina, 842 15 Bratislava, Slovak Republic.
| | - Martina Košlabová
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovičova 6, Mlynská Dolina, 842 15 Bratislava, Slovak Republic.
| | - Martina Končálová
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovičova 6, Mlynská Dolina, 842 15 Bratislava, Slovak Republic.
| | - Radoslav Halko
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovičova 6, Mlynská Dolina, 842 15 Bratislava, Slovak Republic.
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Halko R, Hagarová I, Andruch V. Innovative approaches in cloud-point extraction. J Chromatogr A 2023; 1701:464053. [PMID: 37207414 DOI: 10.1016/j.chroma.2023.464053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 05/05/2023] [Accepted: 05/07/2023] [Indexed: 05/21/2023]
Abstract
Cloud-point extraction (CPE) is a pre-treatment technique for the extraction and preconcentration of different chemical compounds, such as metal ions, pesticides, drugs, phenols, vitamins etc., from various samples. CPE is based on the phenomenon of two phases (micellar and aqueous) forming after the heating of an aqueous isotropic solution of a non-ionic or zwitterionic surfactant above the cloud-point temperature. If analytes are added to the surfactant solution under suitable conditions, they should be extracted into the micellar phase, also called the surfactant-rich phase. Recently, the traditional CPE procedure is being increasingly replaced by improved CPE procedures. In this study, recent advances in CPE over the last three years (2020 - 2022), including the application of various innovative approaches, are reviewed. In addition to the basic principle of CPE, alternative extraction media in CPE, CPE supported by various auxiliary energies, a different modified CPE procedure and the use nanomaterials and solid-phase extraction in combination with CPE are presented and discussed. Finally, some future trends for improved CPE are presented.
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Affiliation(s)
- Radoslav Halko
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava IV, Slovak Republic.
| | - Ingrid Hagarová
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava IV, Slovak Republic
| | - Vasil Andruch
- Department of Analytical Chemistry, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice 041 80, Slovak Republic
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Thirunavukkarasu GK, Gowrisankaran S, Caplovicova M, Satrapinskyy L, Gregor M, Lavrikova A, Gregus J, Halko R, Plesch G, Motola M, Monfort O. Contribution of photocatalytic and Fenton-based processes in nanotwin structured anodic TiO 2 nanotube layers modified by Ce and V. Dalton Trans 2022; 51:10763-10772. [PMID: 35503460 DOI: 10.1039/d2dt00829g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In the present work, nanotwin structured TiO2 nanotube (TNT) layers are prepared by the electrochemical anodization technique to form the anatase phase and by surface modification via spin-coating of Ce and V precursors to form Ce-TNT and V-TNT, respectively. The surface and cross-sectional images by SEM revealed that the nanotubes have an average diameter of ∼130 nm and a length of ∼14 μm. In addition, the TEM images revealed the nanotwin structures of the nanotubes, especially the anatase (001) and (112) twin surfaces, that increase the transport of photogenerated charges. The photoinduced degradation of caffeine (CAF) by TNT, Ce-TNT, and V-TNT led to a degradation extent of 16%, 26% and 33%, respectively, whereas it increased to 26%, 38%, and 46% in the presence of H2O2, owing to the involvement of Fenton-based processes (in addition to photocatalysis). The effect of the Fenton-based processes accounts for about 10% of the total degradation extent of CAF. Finally, the mechanism of the photoinduced degradation of CAF was investigated. The main oxidative species were the hydroxyl radicals, and the better efficiency of V-TNT over Ce-TNT and TNT was ascribed to its negative surface, thus improving the interactions with CAF.
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Affiliation(s)
- Guru Karthikeyan Thirunavukkarasu
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia.
| | - Sridhar Gowrisankaran
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia.
| | - Maria Caplovicova
- STU Center for Nanodiagnostics, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Vazovova 5, 812 43 Bratislava, Slovakia
| | - Leonid Satrapinskyy
- Department of Experimental Physics, Faculty of Mathematics Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina, 842 48 Bratislava, Slovakia
| | - Maros Gregor
- Department of Experimental Physics, Faculty of Mathematics Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina, 842 48 Bratislava, Slovakia
| | - Aleksandra Lavrikova
- Division of Environmental Physics, Faculty of Mathematics Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina, 842 48 Bratislava, Slovakia
| | - Jan Gregus
- Department of Experimental Physics, Faculty of Mathematics Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina, 842 48 Bratislava, Slovakia
| | - Radoslav Halko
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia
| | - Gustav Plesch
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia.
| | - Martin Motola
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia.
| | - Olivier Monfort
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15 Bratislava, Slovakia.
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Kriegerová K, Procházková S, Tuček J, Rísová V, Halko R. Determination of lead in human placenta tissue employing slurry sampling and detection by electrothermal atomic absorption spectrometry. Anal Methods 2020; 12:4235-4244. [PMID: 32830831 DOI: 10.1039/d0ay00848f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A new analytical procedure was developed for the determination of lead in human placental tissue by direct ultrasonic slurry sampling combined with electrothermal atomic absorption spectrometry (SS-ET AAS). Samples of dried and crushed placental tissue were mixed with 10 mL of 0.20% (v/v) HNO3 and homogenised. The slurries were then transferred to autosampler cups where they were sonicated using an ultrasonic probe prior to injection into a graphite tube with an L'vov platform. The effects of several chemical modifiers, including Mg(NO3)2, Pd(NO3)2, and NH4H2PO4, were investigated for the stabilisation of lead during thermal pre-treatment. Lead in the slurries was effectively stabilised up to 1200 °C with the Pd(NO3)2 modifier providing the best results with complete atomisation at 1900 °C. H2O2 was used as a chemical modifier; dilute HNO3 and HCl were examined as slurry media. The limit of detection and the limit of quantification for lead obtained under optimised conditions were 0.17 μg g-1 and 0.56 μg g-1, respectively. The relative standard deviation estimated from twenty replicate measurements of spike solution at a concentration of 50.00 μg L-1 for lead was 1.51%. The accuracy of the method was confirmed by analysis of the standard reference material BCR 185R "Bovine Liver". The proposed technique is simple, sensitive and environmentally friendly, and the risk of contamination is low. The method was applied to lead determination in real samples of human placental tissue. The 14 samples were taken just after delivery at the Gynaecology and Obstetrics Department of the Faculty Hospital with Outpatients Clinic in Bratislava over the course of 2019.
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Affiliation(s)
- Katarína Kriegerová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Analytical Chemistry, Ilkovičova 6, Mlynská dolina, 842 15 Bratislava, Slovak Republic
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Santana-Viera S, Tuček J, Torres-Padrón ME, Sosa-Ferrera Z, Santana-Rodríguez JJ, Halko R. Cytostatic compounds in sludge and sediment: extraction and determination by a combination of microwave-assisted extraction and UHPLC-MS/MS. Anal Bioanal Chem 2020; 412:3639-3651. [PMID: 32291518 DOI: 10.1007/s00216-020-02600-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/27/2020] [Accepted: 03/13/2020] [Indexed: 12/17/2022]
Abstract
Cytostatic compounds are an important group of micro-pollutants since they are used to kill cells or stop cell division. For this reason, they are also considered mutagenic. Several cytostatic compounds have been detected in hospital effluents, in the influents and effluents of wastewater treatment plants and even in river water. However, their detection in solid matrices is very scarce. In this work, we have developed a new procedure based on microwave-assisted extraction (MAE) for the extraction of cytostatic compounds from sludge and sediment before determination by ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS). To develop this procedure, we have chosen a group of eight widely used cytostatic compounds and carried out a systematic experimental design to optimize the extraction conditions. Under these optimal conditions, the studied cytostatic compounds are extracted with good sensitivity, with recoveries ranging from 65 to 122% in sludge and recoveries varying between 49 and 109% in sediment, with the exception of etoposide, which has a lower recovery from these types of samples. The limits of detection were from 0.42 to 79.8 ng g-1 in sludge and from 0.10 to 87.5 ng g-1 in sediment. Intraday and interday relative standard deviations (RSDs) were below 15% and 18%, respectively, in both matrices at the tested concentrations. The total procedure was applied to samples of sludge taken from the main wastewater treatment plant (WWTP) of the island of Gran Canaria (Spain) and for sediment samples obtained close to the marine outfalls of different wastewater treatment plants for the same island. Graphical abstract.
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Affiliation(s)
- Sergio Santana-Viera
- Instituto Universitario de Estudios Ambientales y Recursos Naturales (i-UNAT), Universidad de Las Palmas de Gran Canaria, 35017, Las Palmas de Gran Canaria, Spain
| | - Jozef Tuček
- Faculty of Natural Sciences, Department of Analytical Chemistry, Comenius University in Bratislava, Ilkovičova 6, 842 15, Bratislava, Slovak Republic
| | - María Esther Torres-Padrón
- Instituto Universitario de Estudios Ambientales y Recursos Naturales (i-UNAT), Universidad de Las Palmas de Gran Canaria, 35017, Las Palmas de Gran Canaria, Spain
| | - Zoraida Sosa-Ferrera
- Instituto Universitario de Estudios Ambientales y Recursos Naturales (i-UNAT), Universidad de Las Palmas de Gran Canaria, 35017, Las Palmas de Gran Canaria, Spain
| | - José Juan Santana-Rodríguez
- Instituto Universitario de Estudios Ambientales y Recursos Naturales (i-UNAT), Universidad de Las Palmas de Gran Canaria, 35017, Las Palmas de Gran Canaria, Spain.
| | - Radoslav Halko
- Faculty of Natural Sciences, Department of Analytical Chemistry, Comenius University in Bratislava, Ilkovičova 6, 842 15, Bratislava, Slovak Republic
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Halko R, Sanz CP, Ferrera ZS, RodrÍguez JJS. Determination of Benzimidazole Fungicides in Soil Samples Using Microwave-Assisted Micellar Extraction and Liquid Chromatography with Fluorescence Detection. J AOAC Int 2019. [DOI: 10.1093/jaoac/89.5.1403] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A simple and fast analytical method was developed for the determination of benzimidazole fungicides (benomyl, carbendazim, thiabendazole, and fuberidazole) in soil samples. The analytes were extracted from the soil samples by means of conventional microwave-assisted extraction, using the non-ionic surfactants polyoxyethylene 10 lauryl ether (POLE) and oligoethylene glycol monooalkyl ether (Genapol X-080) as extractants. Determinations were made by using liquid chromatography with direct fluorescence detection. The use of an analytical column Symmetry C-18 offered short retention times of analytes without the need of any pH regulators with mobile phase methanolwater (50 + 50, v/v). The best results were obtained using 5% (v/v) POLE as extractant with recoveries of the fungicides in spiked soil samples between 71 and 105%. The results were compared with those obtained when Soxhlet extraction was applied to the same soil samples.
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Affiliation(s)
- Radoslav Halko
- Comenius University, Department of Analytical Chemistry, Faculty of Natural Sciences, Bratislava 842 15, Slovakia
| | - Carolina PadrÓn Sanz
- University of Las Palmas de Gran Canaria, Faculty of Marine Sciences, Department of Chemistry, Las Palmas de Gran Canaria 35017, Spain
| | - Zoraida Sosa Ferrera
- University of Las Palmas de Gran Canaria, Faculty of Marine Sciences, Department of Chemistry, Las Palmas de Gran Canaria 35017, Spain
| | - JosÉ Juan Santana RodrÍguez
- University of Las Palmas de Gran Canaria, Faculty of Marine Sciences, Department of Chemistry, Las Palmas de Gran Canaria 35017, Spain
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Boháčová I, Procházková S, Halko R. Separation and determination of amygdalin and unnatural neoamygdalin in natural food supplements by HPLC-DAD. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2019; 36:1445-1452. [PMID: 31397641 DOI: 10.1080/19440049.2019.1650962] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
This work is focused on separation and determination of amygdalin and its unnatural form neoamygdalin in natural food supplements. Reversed-phase high-performance liquid chromatography with a high-stability silica-based column with C18 functional group has been used for solving this problem. The effect of the mobile phase composition as well as the column temperature on the separation of the amygdalin epimers has been investigated. Isocratic elution using a mobile phase composed of 0.05% aqueous formic acid and acetonitrile achieved the required separation within 17 min. Under optimum chromatographic conditions, the developed method was validated and was applied for the determination of amygdalin epimers in natural food supplements containing apricot or peach kernels. A simple extraction method using methanol as an extractant supported by an ultrasonic bath was used with recovery in the range of 94.8% to 104.3%. The limit of detection and limit of quantification values for R-amygdalin were 0.13 mg/L and 0.40 mg/L, respectively. The developed method proved to be precise with the intra-day and inter-day relative standard deviation values less than 2.23%.
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Affiliation(s)
- Iveta Boháčová
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Bratislava , Slovak Republic
| | - Simona Procházková
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Bratislava , Slovak Republic
| | - Radoslav Halko
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Bratislava , Slovak Republic
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Schreiber L, Morovič M, Špacayová K, Halko R. Colchicine Extract Suicidal Lethal Poisoning Confirmation Using High-Resolution Accurate Mass Spectrometry: A Case Study. J Forensic Sci 2018; 64:1274-1280. [PMID: 30536549 DOI: 10.1111/1556-4029.13977] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 11/19/2018] [Accepted: 11/19/2018] [Indexed: 11/28/2022]
Abstract
A case of suspected acute and lethal intoxication caused by colchicine has been reported. The woman was hospitalized after her suspicion of suicidal poisoning by a rare autumn crocus (Colchicum autumnale). Suspected colchicine poisoning was confirmed using a novel UHPLC method with a modern reversed-phase stationary phase with a sub 2-micron superficial porous particle size combined with a QTOF mass spectrometer. Sample preparation procedure included the addition of propiverine as internal standard, protein precipitation using methanol and solid phase extraction. High-resolution MS only and targeted MS/MS modes are reported for the qualitative analysis and screening of other potential drugs of abuse in blood samples. All Ion MS mode was used for quantitative determination of colchicine afterward. The concentration of colchicine in the blood sample was approximately 41 ng/mL, and more than 200 μg/mL of the plant extract used for the suicide.
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Affiliation(s)
- Ludovit Schreiber
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Martin Morovič
- Faculty of Natural Sciences, University of Constantine the Philosopher, Trieda Andreja Hlinku 1, 949 74, Nitra, Slovakia
| | - Katarína Špacayová
- Health Care Surveillance Authority, Forensic and Toxicology Department, Ipelská 1, 04374, Kosice, Slovakia
| | - Radoslav Halko
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
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Gáplovská K, Šimonovičová A, Halko R, Okenicová L, Žemberyová M, Čerňanský S, Brandeburová P, Mackuľak T. Study of the binding sites in the biomass of Aspergillus niger wild-type strains by FTIR spectroscopy. Chem Pap 2018. [DOI: 10.1007/s11696-018-0487-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Schreiber L, Halko R, Hutta M. Fast ultra-high-performance liquid chromatography with diode array and mass spectrometry method for determination of tadalafil drug substance and its impurities. Biomed Chromatogr 2017; 31. [DOI: 10.1002/bmc.4020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 05/03/2017] [Accepted: 05/26/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Ludovit Schreiber
- Comenius University in Bratislava; Faculty of Natural Science, Department of Analytical Chemistry; Bratislava Slovakia
| | - Radoslav Halko
- Comenius University in Bratislava; Faculty of Natural Science, Department of Analytical Chemistry; Bratislava Slovakia
| | - Milan Hutta
- Comenius University in Bratislava; Faculty of Natural Science, Department of Analytical Chemistry; Bratislava Slovakia
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Boháčová I, Halko R, Jandera P. The effects of temperature and mobile phase on the retention of aliphatic carboxylic acids in hydrophilic interaction chromatography on zwitterionic stationary phases. J Sep Sci 2016; 39:4732-4739. [DOI: 10.1002/jssc.201601049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 10/18/2016] [Accepted: 10/18/2016] [Indexed: 02/04/2023]
Affiliation(s)
- Iveta Boháčová
- Faculty of Natural Sciences, Department of Analytical Chemistry; Comenius University in Bratislava; Bratislava Slovakia
| | - Radoslav Halko
- Faculty of Natural Sciences, Department of Analytical Chemistry; Comenius University in Bratislava; Bratislava Slovakia
| | - Pavel Jandera
- Faculty of Chemical Technology; Department of Analytical Chemistry; University of Pardubice; Pardubice Czech Republic
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Hutta M, Chalányová M, Halko R, Góra R, Dokupilová S, Rybár I. Reversed phase liquid chromatography trace analysis of pesticides in soil by on-column sample pumping large volume injection and UV detection. J Sep Sci 2009; 32:2034-42. [DOI: 10.1002/jssc.200900036] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Wachsberger P, Halko R, Dicker A. Relative Sensitivities of U87 Glioblastoma (GBM) Xenografts Expressing Mutant Epidermal Growth Factor Receptor (EGFRvIII) or Wild Type EGFR to Combined Therapy with Cetuximab and/or Temozolomide (TMZ) and Radiation Therapy (RT). Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Halko R, Padrón Sanz C, Sosa Ferrera Z, Santana Rodríguez JJ. Determination of benzimidazole fungicides in soil samples using microwave-assisted micellar extraction and liquid chromatography with fluorescence detection. J AOAC Int 2006; 89:1403-9. [PMID: 17042192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A simple and fast analytical method was developed for the determination of benzimidazole fungicides (benomyl, carbendazim, thiabendazole, and fuberidazole) in soil samples. The analytes were extracted from the soil samples by means of conventional microwave-assisted extraction, using the non-ionic surfactants polyoxyethylene 10 lauryl ether (POLE) and oligoethylene glycol monooalkyl ether (Genapol X-080) as extractants. Determinations were made by using liquid chromatography with direct fluorescence detection. The use of an analytical column Symmetry C-18 offered short retention times of analytes without the need of any pH regulators with mobile phase methanol-water (50 + 50, v/v). The best results were obtained using 5% (v/v) POLE as extractant with recoveries of the fungicides in spiked soil samples between 71 and 105%. The results were compared with those obtained when Soxhlet extraction was applied to the same soil samples.
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Affiliation(s)
- Radoslav Halko
- Comenius University, Department of Analytical Chemistry, Faculty of Natural Sciences, Bratislava, Slovakia
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Hutta M, Chalányová M, Halko R, Góra R, Rybár I, Pajchl M, Dokupilová S. New approach to large-volume injection in reversed-phase high performance liquid chromatography: Determination of atrazine and hydroxyatrazine in soil samples. J Sep Sci 2006; 29:1977-87. [PMID: 17017010 DOI: 10.1002/jssc.200600049] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A well established method of direct injection of larger than conventional sample volumes ranging from 0.1 mL to 10 mL in HPLC is the injection valve method in which a loop of tubing is totally or partially filled with sample. Recent HPLC pumps have a flow-rate setting accuracy of +/- 1-2% over a flow-rate range from 0.1 mL/min to 10 mL/min and the flow stability is 0.2% or less. Quarternary low pressure gradient pumps are widely available and used, but all their hydraulic lines are seldom utilised. The idea of using one line of a common commercial HPLC quaternary low-pressure pump for direct on-column injection (pumping) of large sample volumes ranging from 1 mL to 100 mL was tested. This approach was evaluated during practical work on the development of an RP-HPLC method of determination of residual atrazine and hydroxyatrazine. In lysimetric environmental experiments hydroxyatrazine was formed in situ in a soil column by hydrolysis of atrazine. The results proved the applicability of this approach not only in experiments with model mixtures of analytes at microg/L levels in solutions. Analysis of 20 mL of soil leachates and extracts of soil samples containing atrazine and hydroxyatrazine at the 10 microg/kg level (in dry soil) revealed that good figures-of-merit were preserved, even in the presence of a large excess of humic substances.
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Affiliation(s)
- Milan Hutta
- Department of Analytical Chemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia.
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Santana Rodríguez JJ, Halko R, Betancort Rodríguez JR, Aaron JJ. Environmental analysis based on luminescence in organized supramolecular systems. Anal Bioanal Chem 2006; 385:525-45. [PMID: 16601954 DOI: 10.1007/s00216-006-0342-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Revised: 01/26/2006] [Accepted: 01/27/2006] [Indexed: 11/26/2022]
Abstract
The use of organized supramolecular systems-including micellar media and cyclodextrin inclusion complexes-combined with luminescence techniques in the study and determination of compounds and elements of environmental interest from 1990 to 2005 is reviewed. Analyses of environmental samples performed using fluorescence, photochemically induced fluorescence and phosphorescence spectroscopy as well as liquid chromatography, capillary electrophoresis and flow injection with luminescence detection in the presence of these organized media are described in detail.
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Affiliation(s)
- J J Santana Rodríguez
- Department of Chemistry, Faculty of Marine Sciences, University of Las Palmas de G.C., 35017 Las Palmas, Spain
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20
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Padrín-Sanz C, Halko R, Sosa-Ferreraa Z, Santana-Rodríguez JJ. Combination of microwave assisted micellar extraction and liquid chromatography for the determination of organophosphorous pesticides in soil samples. J Chromatogr A 2005; 1078:13-21. [PMID: 16007976 DOI: 10.1016/j.chroma.2005.05.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A new methodology based on the microwave assisted micellar extraction (MAME) technique has been optimised, using soil samples, to extract and determine a mixture of the eight organophosphorous pesticides mainly used in agriculture. The pesticides under study have been extracted using the non-ionic surfactants polyoxyethylene 10 lauryl ether (POLE) and oligoethylene glycol monoalkyl ether (Genapol X-080). The optimal extraction variables, such as surfactant concentration, pH, radiation time and microwave power were determined for each surfactant. The results show the advantage of using POLE instead of Genapol X-080 for the extraction of the organophosphorus pesticides with recoveries higher than 70% for most of the compounds and relative standard deviations (RSD) below 2.6%. This method was successfully applied to fresh samples as well as to aged samples for the analysis of soils with different characteristics and compared with the traditional Soxhlet technique.
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Affiliation(s)
- C Padrín-Sanz
- Department of Chemistry, Faculty of Marine Sciences, University of Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
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Halko R, Sanz CP, Ferrera ZS, Rodr�guez JJS. Determination of Benzimidazole Fungicides by HPLC with Fluorescence Detection After Micellar Extraction. Chromatographia 2004. [DOI: 10.1365/s10337-004-0364-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Pobozy E, Halko R, Krasowski M, Wierzbicki T, Trojanowicz M. Flow-injection sample preconcentration for ion-pair chromatography of trace metals in waters. Water Res 2003; 37:2019-2026. [PMID: 12691886 DOI: 10.1016/s0043-1354(02)00615-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Selected trace transition metal ions have been determined in an FIA/HPLC hyphenated system using on-line preconcentration on cellulose functionalised sorbent Cellex P. For HPLC separation ion-pair chromatography was employed with spectrophotometric detection at 510 nm using post-column derivatisation with PAR. Favourable kinetic conditions of sorption and elution as well as optimisation of hyphenated system allowed to obtain detection limits at sub-microgL(-1) level at 25 min preconcentration time. The developed method was employed for determination of Co(II), Ni(II), Cd(II) and Mn(II) in river water with reasonable agreement of obtained results with electrothermal AAS determination.
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Affiliation(s)
- Ewa Pobozy
- Department of Chemistry, Warsaw University, Pasteura 1, Poland.
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Surowiec I, Orska-Gawryś J, Biesaga M, Trojanowicz M, Hutta M, Halko R, Urbaniak-Walczak K. Identification of Natural Dyestuff in Archeological Coptic Textiles by HPLC with Fluorescence Detection. ANAL LETT 2003. [DOI: 10.1081/al-120020154] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hutta M, Megová S, Halko R. Separation of mercury(II), methylmercury and phenylmercury by micellar high-performance liquid chromatography on short columns. J Radioanal Nucl Chem 1998. [DOI: 10.1007/bf02387318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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