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Kovalenko IO, Panasiuk MI, Sosonna NV, Khan VEI, Buzynnyi MG, Koliabina ІL, Оnyshchenko IP. Factors influencing the increased 90Sr radioisotope migration in highly alkaline groundwater at Chornobyl NPP site. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2024; 275:107431. [PMID: 38626658 DOI: 10.1016/j.jenvrad.2024.107431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 04/03/2024] [Accepted: 04/05/2024] [Indexed: 04/18/2024]
Abstract
This paper analyses the formation of high Sr2+ concentration in strong alkaline (pH = 9.5-12.5) groundwater using data of the 27 years of observations around the destroyed Chernobyl NPP Unit 4. It appears that the formation of strong alkaline groundwater in different monitoring wells is consistent with the distribution of 90Sr, pH and main ions. The reason for the increase in 90Sr concentrations is the process of its migration from the sources of contamination - leaks of highly active water localized in certain premises inside the «Shelter » object. These computational experiments showed that for the groundwater in pH range 9.5-12.4, the concentration of strontium in the form of SrOH + increases and in the form of Sr2+ - decreases. In addition, the fraction of 90Sr in the form of a soluble neutral complex compound SrCO30, which is not sorbed, reaches 14-35%. Increased fractions of 90Sr in forms of SrOH+ and SrCO3 are factors which reduce the isotope ability to be sorbed by soils and therefore increase its migration ability. In strongly alkaline groundwater a sharp increase in 90Sr volumetric activity may also be caused by ionic strength (IS) increase above 5 mmol/L. Thus, the factors that influence the increase in 90Sr volumetric activity in strongly alkaline groundwater are the formation of its complex compounds and an increase in ionic strength (IS), which reduces the thickness of the double electric layer and, as a result, reduces the sorption capacity of soils.
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Affiliation(s)
- I O Kovalenko
- Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine.
| | - M I Panasiuk
- Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine.
| | - N V Sosonna
- Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine.
| | - V E-I Khan
- Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine.
| | - M G Buzynnyi
- SI «O.M. Marzieiev Institute for Public Health», NAMSU, 50 Popudrenko Street, Kyiv, 02094, Ukraine.
| | - І L Koliabina
- Institute of Geological Science of Ukraine National Science Academy, 54 Volodymyrska Street, Kyiv, 01030, Ukraine.
| | - I P Оnyshchenko
- Institute of Geological Science of Ukraine National Science Academy, 54 Volodymyrska Street, Kyiv, 01030, Ukraine.
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Shi J, Zhang J, Wang C, Liu Y, Li J. Research progress on the magnetite nanoparticles in the fields of water pollution control and detection. CHEMOSPHERE 2023:139220. [PMID: 37327826 DOI: 10.1016/j.chemosphere.2023.139220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/08/2023] [Accepted: 06/13/2023] [Indexed: 06/18/2023]
Abstract
Magnetite nanoparticles (MNPs) have shown increasing application in the fields of water pollution control and detection due to their perfect combination of interfacial functionalities and physicochemical properties, such as surface interface adsorption, (synergistic) reduction, catalytic oxidation, and electrical chemistry. This review presents the research advances in the synthesis and modification methods of MNPs in recent years, systematically summarizes the performances of MNPs and their modified materials in terms of three technical systems, including single decontamination system, coupled reaction system, and electrochemical system. In addition, the progress of the key roles played by MNPs in adsorption, reduction, catalytic oxidative degradation and their coupling with zero-valent iron for the reduction of pollutants are described. Moreover, the application prospect of MNPs-based electrochemical working electrodes for detecting micro-pollutants in water were also discussed in detail. This review addresses that the construction of MNPs-based systems for water pollution control and detection should be adapted to the natures of the target pollutants in water. Finally, the following research directions of MNPs and their remaining challenges are outlooked. In general, this review will inspire MNPs researchers in different fields for effective control and detection of a variety of contaminants in water.
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Affiliation(s)
- Jianxuan Shi
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China
| | - Jinhua Zhang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China.
| | - Chengze Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China
| | - Yiwei Liu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China
| | - Jinxiang Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China.
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Singh BSM, Dhal NK, Kumar M, Mohapatra D, Seshadri H, Nayak M. Retaliation of Alstonia scholaris (L.) R.Br. to caesium and strontium in hydroponics: effect on morpho-physiology and induction of enzymatic defence. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:703. [PMID: 37212912 DOI: 10.1007/s10661-023-11304-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 04/25/2023] [Indexed: 05/23/2023]
Abstract
The habitation and environment are affected by the stable isotopes of caesium (Cs) and strontium (Sr), as well as by their radioactive isotopes. The current work gives insight on Alstonia scholaris' capacity to phytoextract stable caesium (Cs) and strontium (Sr), as well as the plant's ability to protect against the toxicity of both elements. Experiments with Cs [0-5 mM (CsCl)] and Sr [0-3 mM (SrCl2. 6H2O)] dosing in controlled light, temperature, and humidity condition in greenhouse for 21 days were undertaken. Cs and Sr accumulation in different plant parts was quantified with atomic absorption spectroscopy (AAS) and inductively coupled plasma-optical emission spectrometry (ICP-OES) respectively. Hyper-accumulation capacity for Cs and Sr was estimated with indices like transfer factor (TF) and translocation factors (TrF). The uptake pattern of caesium in Alstonia scholaris is 5452.8-24,771.4 mg/kg DW (TF = 85.2-57.6) and in the case of Sr is 1307.4-8705.7 mg/kg DW (TF = 85.3-1.46). The findings demonstrated the plant's ability to transfer Cs and Sr to aboveground biomass on the basis of dry weight, with the majority of the metals being deposited in the shoot rather than the root portion of the plant. For Cs and Sr, with increasing concentration, the plants exhibited the enzymatic expression for defence against metal toxicity by free radicals compared to control. Field emission electron microscopy with energy-dispersive spectroscopy (FESEM with EDS) was employed to assess the spatial distribution of Cs and Sr in plant leaf, indicating the accumulation of Cs, Sr, and their homologous components.
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Affiliation(s)
- B S Manisha Singh
- Environment and Sustainability Department, CSIR-IMMT, Bhubaneshwar, 751013, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
| | - Nabin Kumar Dhal
- Environment and Sustainability Department, CSIR-IMMT, Bhubaneshwar, 751013, India
| | - Manish Kumar
- Environment and Sustainability Department, CSIR-IMMT, Bhubaneshwar, 751013, India
| | | | | | - Monalisha Nayak
- Atomic Energy Regulatory Board, Niyamak Bhavan, Anushakti Nagar, Mumbai, 400094, India
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Kiryushina A, Bondarenko L, Dzeranov A, Kydralieva K, Patsaeva S, Terekhova V. The effect of silica-magnetite nanoparticles on the ecotoxicity of the antibiotic ciprofloxacin. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:55067-55078. [PMID: 36884170 DOI: 10.1007/s11356-023-26233-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
The increase in the production and application of engineered nanomaterials, including nanoparticles (NPs), leads to their discharge into the environment, where they can interact with coexisting antibiotics from wastewater, causing a complicated joint effect on organisms that need to be studied. Herein, a typical engineered nanomaterial, silica-magnetite NPs modified with tetraethoxysilane and 3-aminopropyltriethoxysilane (MTA-NPs, 1-2 g/L), and common antibiotic ciprofloxacin (CIP, 0-5 mg/L) were selected as the analytes. Their joint toxicity to a model of ciliates infusoria, Paramecium caudatum was specifically investigated. The impact of CIP, MTA-NPs, and humic acids (HA) was tracked for 24 h, individually and collectively, on the mortality of infusoria. The addition of MTA-NPs and HA at the studied concentrations leads to 40% mortality of organisms. The combined presence of the MTA-NPs at a concentration of 1.5-2 mg/L and HA at a concentration of 20-45 mg/L has a multiplier effect and allows to reduce the mortality rate of ciliates > 30% due to the enhanced removal of CIP. That finding demonstrated a clearly detoxifying role of dissolved organic matter (here, humic substances) in case of complex water pollution where pharmaceuticals and nanomaterials are presented.
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Affiliation(s)
- Anastasiya Kiryushina
- Institute of Ecology and Evolution of the Russian Academy of Sciences, Leninsky Prospekt 33, Moscow, 119071, Russian Federation.
| | - Lyubov Bondarenko
- Moscow Aviation Institute (National Research University), 125993, Moscow, Russian Federation
| | - Artur Dzeranov
- Moscow Aviation Institute (National Research University), 125993, Moscow, Russian Federation
- Sklifosofskiy Research Institute of Emergency Medicine, Moscow, 129010, Russia
| | - Kamila Kydralieva
- Moscow Aviation Institute (National Research University), 125993, Moscow, Russian Federation
| | - Svetlana Patsaeva
- Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow, 119991, Russian Federation
| | - Vera Terekhova
- Institute of Ecology and Evolution of the Russian Academy of Sciences, Leninsky Prospekt 33, Moscow, 119071, Russian Federation
- Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow, 119991, Russian Federation
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Morelová N, Finck N, Lützenkirchen J, Schild D, Dardenne K, Geckeis H. Sorption of americium / europium onto magnetite under saline conditions: Batch experiments, surface complexation modelling and X-ray absorption spectroscopy study. J Colloid Interface Sci 2020; 561:708-718. [PMID: 31767395 DOI: 10.1016/j.jcis.2019.11.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 10/25/2022]
Abstract
HYPOTHESIS This study investigates the adsorption of americium and its chemical analogue europium on magnetite, which is expected to form as a major long-term steel canister corrosion product under anoxic and highly saline conditions. EXPERIMENTS The sorption of europium on magnetite (solid/liquid ratio = 0.5 g/L) was investigated batch wise in NaCl brines with ionic strength I = 1 m, 3.5 m, and 6.67 m, as a function of pHm for two europium concentrations (6 × 10-10m, 1.2 × 10-5m). Information on the chemical nature of the surface species was obtained by X-ray absorption spectroscopy (XAS) at the americium L3-edge. FINDINGS Retention of europium by magnetite of >99.5% was found above pHm 6.4 for all ionic strengths for europium concentration of 6 × 10-10m. No ionic strength effect was observed in this pHm range. At 1.2 × 10-5m europium concentration, 95 ± 4% sorption was found above pHm 7.5 for I = 1 m and above pHm 8.0 for I = 3.5 m and 6.67 m. A small ionic strength effect was observed in this case. X-ray absorption spectroscopy (XAS) results are consistent with the batch sorption experiment outcomes, showing an insignificant effect of ionic strength on the pHm dependent sorption. Results from potentiometric titrations of the solid phase, batch sorption experiments and spectroscopy were interpreted consistently with a charge distribution multi-site (CD-MUSIC) triple layer surface complexation model assuming surface coordination of the metal ion via a tridentate binding mode.
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Affiliation(s)
- Nikoleta Morelová
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Nicolas Finck
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Johannes Lützenkirchen
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Kathy Dardenne
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Horst Geckeis
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
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ElShazly AAA, Abbas MHH, Farid IM, Rizk MA, Mohamed I, Abbas HH, Abdelhafez AA, Soliman SM, Abdel Sabour MF. Feasibility of using natural mineral ores for removing Cs and Sr from contaminated water. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 175:173-180. [PMID: 30897416 DOI: 10.1016/j.ecoenv.2019.03.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 02/23/2019] [Accepted: 03/12/2019] [Indexed: 06/09/2023]
Abstract
Proper and economical treatments of wastewater are among the important and potential solutions to increase the water budget. Although mineral ores are barriers of potentially toxic metal contaminants; however to what extent, can these ores stand successfully for decontaminating waters polluted with Cs or Sr is the question of the current study. Therefore a trial was carried out on some of these ores i.e. kaolinite, montmorillonite, and illite, to investigate their effects as decontaminants for waters polluted with either 50 μg Cs L-1 or 50 μg Sr L-1. Results showed that sorption of Cs and Sr increased with decreasing the ratio of the applied sorbents to the quantities of contaminated waters. Such a finding was more obvious when the rate of the sorbent: water was only 1 g L-1. The highest sorption was attained by montmorillonite followed by kaolinite, then Illite. Thus, montmorillonite was selected to complete the sorption studies at a rate of 1 g L-1. Sorption of both Cs and Sr and consequently their removal efficiencies increased with increasing the pH of the sorbents-contaminated waters suspensions up to 7 beyond which significant reductions occurred. Also, increasing the temperature of the suspension resulted in significant increases in the removal efficiencies of the investigated sorbents. Only 120 min were enough to attain the highest removal efficiency. Moreover, Ca-salts could successfully substitute sorbed Cs and Sr on surfaces of the montmorillonite used previously for decontamination of these elements from waters. Accordingly, this mineral ore can be reused successively for further decontamination processes.
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Affiliation(s)
- Amal A A ElShazly
- Soils and Water Department, Faculty of Agriculture, Benha University, Egypt; Nuclear Research Center, Egyptian Atomic Energy Authority EAEA, Ishas, Egypt
| | - Mohamed H H Abbas
- Soils and Water Department, Faculty of Agriculture, Benha University, Egypt.
| | - Ihab M Farid
- Soils and Water Department, Faculty of Agriculture, Benha University, Egypt
| | - Magdy A Rizk
- Nuclear Research Center, Egyptian Atomic Energy Authority EAEA, Ishas, Egypt
| | - Ibrahim Mohamed
- Soils and Water Department, Faculty of Agriculture, Benha University, Egypt; Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Science, Wuhan, 430074, China.
| | - Hassan H Abbas
- Soils and Water Department, Faculty of Agriculture, Benha University, Egypt
| | - Ahmed A Abdelhafez
- Soils and Water Department, Faculty of Agriculture, the New Valley University, Egypt
| | - Soliman M Soliman
- Nuclear Research Center, Egyptian Atomic Energy Authority EAEA, Ishas, Egypt
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Attallah MF, Youssef MA, Imam DM. Preparation of novel nano composite materials from biomass waste and their sorptive characteristics for certain radionuclides. RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3108] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Abstract
The aim of this work is directed to prepare nanoparticles of egg shell hydroxyapatite-humic acid (ESHAP-HA) as a novel composite material. FTIR, EDX, TEM, XRD, and SEM identified it. Sorption characteristic studies on ESHAP-HA at different pH of solutions, shaking time, initial ion concentration and complexing agent were performed at 152,154Eu, 99Mo and 63Ni. The results were demonstrated that selectivity removal of 152,154Eu (~96 %) rather than 99Mo (8.5 %) and 63Ni (26.7 %). The sorption capacity of 152,154Eu(III), 63Ni(II) and 99Mo(VI) are 80.1, 12.5 and 2.3 mg/g, respectively, onto the ESHAP-HA nanoparticles. Application on the eclectic removal of 152,154Eu from mixed radionuclides (152,154Eu, 60Co, and 137Cs) solution has been evaluated. It concluded that the prepared ESHAP-HA composite material is a promising and recommended for separation of radio lanthanides and/or actinides (such as Am) from nuclear liquid waste and/or contaminated aquatic environmental.
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Affiliation(s)
- Mohamed F. Attallah
- Analytical Chemistry and Control Department, Hot Laboratories Center, Atomic Energy Authority of Egypt , P.O. Box 13759 , Cairo , Egypt , E-mail:
| | - Maha A. Youssef
- Analytical Chemistry and Control Department, Hot Laboratories Center, Atomic Energy Authority of Egypt , P.O. Box 13759 , Cairo , Egypt
| | - Diaa M. Imam
- Chemistry of Nuclear Fuel Department , Hot Laboratories Center, Atomic Energy Authority of Egypt , P.O. Box 13759 , Cairo , Egypt
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Usman M, Byrne JM, Chaudhary A, Orsetti S, Hanna K, Ruby C, Kappler A, Haderlein SB. Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals. Chem Rev 2018; 118:3251-3304. [PMID: 29465223 DOI: 10.1021/acs.chemrev.7b00224] [Citation(s) in RCA: 174] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mixed-valent iron [Fe(II)-Fe(III)] minerals such as magnetite and green rust have received a significant amount of attention over recent decades, especially in the environmental sciences. These mineral phases are intrinsic and essential parts of biogeochemical cycling of metals and organic carbon and play an important role regarding the mobility, toxicity, and redox transformation of organic and inorganic pollutants. The formation pathways, mineral properties, and applications of magnetite and green rust are currently active areas of research in geochemistry, environmental mineralogy, geomicrobiology, material sciences, environmental engineering, and environmental remediation. These aspects ultimately dictate the reactivity of magnetite and green rust in the environment, which has important consequences for the application of these mineral phases, for example in remediation strategies. In this review we discuss the properties, occurrence, formation by biotic as well as abiotic pathways, characterization techniques, and environmental applications of magnetite and green rust in the environment. The aim is to present a detailed overview of the key aspects related to these mineral phases which can be used as an important resource for researchers working in a diverse range of fields dealing with mixed-valent iron minerals.
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Affiliation(s)
- M Usman
- Environmental Mineralogy, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany.,Institute of Soil and Environmental Sciences , University of Agriculture , Faisalabad 38040 , Pakistan
| | - J M Byrne
- Geomicrobiology, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany
| | - A Chaudhary
- Environmental Mineralogy, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany.,Department of Environmental Science and Engineering , Government College University Faisalabad 38000 , Pakistan
| | - S Orsetti
- Environmental Mineralogy, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany
| | - K Hanna
- Univ Rennes, École Nationale Supérieure de Chimie de Rennes , CNRS, ISCR - UMR6226 , F-35000 Rennes , France
| | - C Ruby
- Laboratoire de Chimie Physique et Microbiologie pour l'Environnement , UMR 7564 CNRS-Université de Lorraine , 54600 Villers-Lès-Nancy , France
| | - A Kappler
- Geomicrobiology, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany
| | - S B Haderlein
- Environmental Mineralogy, Center for Applied Geosciences , University of Tübingen , 72074 Tübingen , Germany
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Ghosh M, Swain KK, Verma R. Interaction of niobium with iron-oxide colloids and the role of humic acid. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2017; 178-179:101-109. [PMID: 28803000 DOI: 10.1016/j.jenvrad.2017.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
In this work, we report the sorption of Nb on iron oxides and the effect of humic acid. Iron oxides viz. goethite, hematite and magnetite were chemically synthesised and characterised by X-ray diffraction, particle size, surface area and zeta potential measurement. The sorption of Nb on all the three iron oxides was low (∼40%) at pH 1, increased to ∼ 90% at pH 8 and decreased marginally above pH 8. The effect of humic acid on the sorption was very small. Thermodynamic parameters viz. activation energy, enthalpy, entropy, free energy and sticking probability were calculated to understand the mechanism of the sorption process. Although the enthalpy was positive, the free energy change was negative i.e. the sorption was entropy driven process. The sorption followed pseudo-second-order kinetics and sticking probability model indicated that the process was chemisorption. This study is important to understand the probable migration of 94Nb (half life 20300 y) during underground storage of radioactive waste.
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Affiliation(s)
- Madhusudan Ghosh
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India; Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - K K Swain
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India; Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Rakesh Verma
- Formerly Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
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Morales J, Manso JA, Cid A, Mejuto JC. Stability study of Iprodione in alkaline media in the presence of humic acids. CHEMOSPHERE 2013; 92:1536-1541. [PMID: 23683355 DOI: 10.1016/j.chemosphere.2013.04.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 04/05/2013] [Accepted: 04/06/2013] [Indexed: 06/02/2023]
Abstract
The influence of humic aggregates in water solution upon the chemical stability of Iprodione has been investigated under basic conditions. Taking into account that an important part of soils are colloids, the possibility of its presence implies that soil composition and its structure will play an important role in the stability of this pesticide. A kinetic model was applied to this system and the kinetic coefficients were obtained. An inhibition upon the alkaline hydrolysis of Iprodione (2-fold) was observed and it was rationalized in terms of the micellar pseudophase model. These results have been compared with the corresponding ones in the same natural colloidal aggregates in the presence of other pesticides.
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Affiliation(s)
- Jorge Morales
- Department of Physical Chemistry, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain.
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Montes ML, Silva LMS, Sá CSA, Runco J, Taylor MA, Desimoni J. Inventories and concentration profiles of 137Cs in undisturbed soils in the northeast of Buenos Aires Province, Argentina. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2013; 116:133-140. [PMID: 23143298 DOI: 10.1016/j.jenvrad.2012.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 10/09/2012] [Accepted: 10/11/2012] [Indexed: 06/01/2023]
Abstract
Inventories and vertical distribution of (137)Cs were determined in La Plata region undisturbed soils, Argentina. A mean inventory value of 891 ± 220 Bq/m(2) was established, which is compatible with the values expected from atmospheric weapon tests fallout. The study was complemented with pH, organic carbon fraction, texture and mineralogical soil analyses. Putting together Southern Hemisphere (137)Cs inventory data, it is possible to correlate these data with the mean annual precipitations. The large differences in (137)Cs concentration profiles were attributed to soil properties, especially the clay content and the pH values. A convection-dispersion model with irreversible retention was used to fit the activity concentration profiles. The obtained effective diffusion coefficient and effective convection velocity parameters values were in the range from 0.2 cm(2)/y to 0.4 cm(2)/y and from 0.23 cm/y to 0.43 cm/y, respectively. These data are in agreement with values reported in literature. In general, with the growth of clay content in the soil, there was an increase in the transfer rate from free to bound state. Finally, the highest transfer rate from free to bound state was obtained for soil pH value equal to 8.
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Affiliation(s)
- M L Montes
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, IFLP -CONICET-UNLP, CC 67, 1900 La Plata, Argentina
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12
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Indarawis K, Boyer TH. Alkaline earth metal cation exchange: effect of mobile counterion and dissolved organic matter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:4591-4598. [PMID: 22424449 DOI: 10.1021/es204289c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The goal of this research was to provide an improved understanding of the interactions between alkaline earth metals and DOM under conditions that are encountered during drinking water treatment with particular focus on cation exchange. Both magnetically enhanced and nonmagnetic cation exchange resins were converted to Na, Mg, Ca, Sr, and Ba mobile counterion forms as a novel approach to investigate the exchange behavior between the cations and the interactions between the cations and DOM. The results show that cation exchange is a robust process for removal of Ca(2+) and Mg(2+) considering competition with cations on the resin surface and presence of DOM. DOM was actively involved during the cation exchange process through complexation, adsorption, and coprecipitation reactions. In addition to advancing the understanding of ion exchange processes for water treatment, the results of this work are applicable to membrane pretreatment to minimize fouling, treatment of membrane concentrate, and precipitative softening.
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Affiliation(s)
- Katrina Indarawis
- Department of Environmental Engineering Sciences, University of Florida, PO Box 116450, Gainesville, Florida 32611-6450, United States
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Seida Y, Terashima M, Tachi Y, Iijima K, Nakazawa T, Yamada M, Yui M. Sorption and diffusion of Eu in sedimentary rock in the presence of humic substance. ACTA ACUST UNITED AC 2010. [DOI: 10.1524/ract.2010.1771] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Sorption and diffusion behaviors of Eu in sedimentary rock in the presence of humic substance were investigated. The sedimentary rock collected from 500 m depth of HDB-6 bore hole at horonobe URL site of Japan and Aldrich humic acid (HA) were used in the present study. Sorption behaviors of Eu and the HA on the sedimentary rocks with and without the rock organic matter (ROM) were elucidated as a function of HA concentration. The HA reduced the sorption of Eu on the rock with the increase of HA. Eu and HA sorption on the rock with the ROM was larger than on the rock after removing the ROM, indicating that the ROM plays an important role on the sorption of Eu and HA. The diffusion of Eu in the presence of HA was examined as a function of HA concentration and molecular weight of the HA (∼150 kDa or below 10 kDa) by means of a reservoir depletion test method with the intact rock core of the sedimentary rock. Depletion of Eu concentration in the reservoir was reduced with the increase of HA concentration. On the other hand, slight depletion of HA concentration in the reservoir was observed, indicating that the larger HA molecule diffused less into the rock. From the depletion curve and in-diffusion profile of Eu in the rock, the effective diffusion coefficient, D
e, and distribution coefficient, K
d, in the intact system were estimated based on the profile fitting of the diffusion data with the conventional simple diffusion-sorption model. It was elucidated that the HA reduced the K
d and D
e of Eu in the intact system with the increase of HA. The contribution of the HA with smaller molecular weight to both the Eu sorption and diffusion was examined.
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Affiliation(s)
| | - M. Terashima
- Japan Atomic Energy Agency, Geological Isolation Research and, Ibaraki, 319-1194, Japan
| | - Y. Tachi
- Japan Atomic Energy Agency, Geological Isolation Research and, Ibaraki, 319-1194, Japan
| | - Kazuki Iijima
- Japan Atomic Energy Agency,, Tokai Research and Development Center, Ibaraki, Japan
| | - T. Nakazawa
- Mitsubishi Materials Cooperation, Ibaraki, 311-0102, Japan
| | - M. Yamada
- Mitsubishi Materials Cooperation, Ibaraki, 311-0102, Japan
| | - Mikazu Yui
- Japan Atomic Energy Agency, Geological Isolation Research and, Ibaraki, 311-1194, Japan
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Giménez J, Martínez-Lladó X, Rovira M, de Pablo J, Casas I, Sureda R, Martinez-Esparza A. Cesium sorption on studtite (UO2O2·4H2O). RADIOCHIM ACTA 2010. [DOI: 10.1524/ract.2010.1742] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
AbstractOne of the mechanisms that may decrease the mobility of cesium released from spent fuel in a high level nuclear waste repository (HLNW) is its sorption onto uranyl-containing alteration phases formed on the spent fuel surface such as studtite (UO2O2·4H2O). The results obtained in this work show that sorption is a very fast process; cesium in solution is sorbed in less than one hour at pH 5. Sorption as a function of initial concentration in solution was also studied between initial cesium concentrations ranging from 7.6×10−9 mol dm−3to 1.0×10−3 mol dm−3. The data have been modelled considering a Freundlich isotherm, withKFandnvalues of 10±1, and 1.4±0.1, respectively (r2=0.998). Sorption is very dependent on ionic strength, suggesting that cesium sorbs onto studtite by forming an outer-sphere complex involving electrostatic interactions. Sorption is observed to be very low at acidic pH, while relatively high at alkaline pH (i.e., almost 60% of the total cesium concentration in solution is sorbed at pH>9). The results point to the importance of sorption processes on uranyl alteration phases on the retention of radionuclides.
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Affiliation(s)
| | | | - Miquel Rovira
- Centre Tecnologic de Manresa (CTM), Manresa, Spanien
| | - Joan de Pablo
- Department of Chemical Engineering (ETSEIB-UPC), Barcelona, Spanien
| | - Ignasi Casas
- Department of Chemical Engineering, (ETSEIB-UPC), Barcelona, Spanien
| | - Rosa Sureda
- Department of Chemical Engineering (ETSEIB-UPC), Barcelona, Spanien
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Lujanienė G, Beneš P, Štamberg K, Šapolaitė J, Vopalka D, Radžiūtė E, Ščiglo T. Effect of natural clay components on sorption of Cs, Pu and Am by the clay. J Radioanal Nucl Chem 2010. [DOI: 10.1007/s10967-010-0726-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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