1
|
Abstract
Abstract
In this work, the possibility of flow coulometry application as coulometric titration was studied. The method was used to analyze phosphates in wastewater samples. The principle of the determination consisted in the formation of molybdophosphate and its subsequent one-electron electrolytic reduction. The present method is applicable under optimal conditions in the concentration range of 1.5 × 10−6 to 5.5 × 10−5 mol/dm3. Detection limit of the method is 3.42 × 10−7 mol/dm3. Mineralization step has been proved a problem in total phosphate content determination. If mineralization was not carried out, only inorganic soluble phosphates were determined. It is a new method characterized by its simplicity of instrumentation and handling, which is a prerequisite for its further use in the field of trace analysis.
Collapse
|
2
|
Packa V, Maedler S, Howell T, Bostan V, Diep N, Tooley R, Furdui VI. Unbiased Measurement of Phosphate and Phosphorus Speciation in Surface Waters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:820-828. [PMID: 30550712 DOI: 10.1021/acs.est.8b05089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Trace-level phosphate analysis and phosphorus speciation in surface water remained challenging due to adsorption and phosphate uptake by microorganisms. In this study a two-dimensional ion chromatography separation coupled to electrospray ionization high-resolution mass spectrometry (2D-IC-ESI-MS) allowed isotope dilution quantitation of phosphate with simultaneous analysis of 11 phosphate-containing metabolites and two inorganic condensed phosphates. Samples were collected from Lake St. Clair, Lake Ontario, and Georgian Bay (ON, Canada). Comparative experiments showed lower phosphate results for samples not immediately spiked and for external calibration quantitation. Field spiking with 18O-labeled phosphate combined with isotope dilution quantitation allows measurement of the phosphate levels existent at the collection time instead of the phosphate concentrations remaining in the samples at the analysis time. This is a significant advantage against the traditional colorimetric and ion chromatographic (IC) analysis methods, which are unable to compensate for the adsorption loss occurring in standards and samples, especially when phosphate is present at levels below 20 μg L-1 as P (61 μg L-1 as PO43-). Two phosphate-containing metabolites, adenosine 5'-monophosphate (AMP) and d-glucose 6-phosphate (Glucose-P), were detected in a subset of samples collected from Lake St. Clair, with no statistically significant correlation between them and the simultaneously measured phosphate. Directly bioavailable P (phosphate), indirectly bioavailable P (phosphatase-hydrolyzed P) and nonbioavailable P (nonhydrolizable P) fractions were quantified by measuring phosphate, phosphate after phosphatase addition and total phosphorus. The proposed 2D-IC-ESI-MS method developed for a QExactive MS instrument with field spiking of the internal standard provides accurate phosphate results and eliminates quantitation errors caused by phosphate adsorption. This setup allows simultaneous collection of targeted and nontargeted analysis data and thus the detection of trace polar organic phosphorus metabolites as well.
Collapse
Affiliation(s)
- Vlastimil Packa
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
- Ryerson University , 350 Victoria Street , Toronto , Ontario M5B 2K3 , Canada
| | - Stefanie Maedler
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
| | - Todd Howell
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
| | - Vadim Bostan
- Ryerson University , 350 Victoria Street , Toronto , Ontario M5B 2K3 , Canada
| | - Ngan Diep
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
| | - Robert Tooley
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
| | - Vasile I Furdui
- Ontario Ministry of the Environment , Conservation and Parks, 125 Resources Road , Toronto , Ontario M9P 3V6 , Canada
- Ryerson University , 350 Victoria Street , Toronto , Ontario M5B 2K3 , Canada
| |
Collapse
|
3
|
Zaporozhets OA, Bas JP, Kachan IA, Zinko LS, Davydov VI. Solid-phase spectrophotometric and test determination of silicate in natural water. Talanta 2012; 90:85-90. [DOI: 10.1016/j.talanta.2011.12.079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 12/27/2011] [Accepted: 12/30/2011] [Indexed: 10/14/2022]
|
4
|
MATSUMIYA H, KIKAI T, HIRAIDE M. Solid-Phase Extraction Followed by HPLC for the Determination of Phosphorus(V) and Arsenic(V). ANAL SCI 2009; 25:207-10. [DOI: 10.2116/analsci.25.207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Hiroaki MATSUMIYA
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University
| | - Takaaki KIKAI
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University
| | - Masataka HIRAIDE
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University
| |
Collapse
|