Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method

The determination of reduced sulfur species in aquatic systems is not an easy and fast task to accomplish regarding the numerous possible interferences and risks of oxidation that occur with the usual methods of quantification. The method presented here is a direct spectrophotometric method that can...

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Main Authors: Sébastien Dupraz, Bénédicte Ménez, François Guyot
Format: Article
Language:English
Published: Wiley 2019-01-01
Series:Journal of Chemistry
Online Access:http://dx.doi.org/10.1155/2019/1039487
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author Sébastien Dupraz
Bénédicte Ménez
François Guyot
author_facet Sébastien Dupraz
Bénédicte Ménez
François Guyot
author_sort Sébastien Dupraz
collection DOAJ
description The determination of reduced sulfur species in aquatic systems is not an easy and fast task to accomplish regarding the numerous possible interferences and risks of oxidation that occur with the usual methods of quantification. The method presented here is a direct spectrophotometric method that can be used to quantify sulfides, sulfites, and thiosulfates in a simple and rapid way. The principle is based on the comparison of second-derivative absorbance spectra of the same sample at different pH (9.2, 4.7, and 1.0) and selected absorption wavelengths (250 and 278 nm). This method has been successfully tested and has demonstrated liability to (i) avoid the biases due to absorbance overlaps between the different major chemical species and (ii) keep, as a direct method, the advantages over indirect methods on interferences reduction. The limits of detections (LOD) reached for total sulfide, sulfite, and thiosulfate are 1.37, 7.32, and 1.92 µM, respectively. The method displays low accuracy mean and low relative standard deviation (<4%) as well as a good linearity (R2 > 0.999). Accordingly, this method represents a very robust alternative in terms of cost and rapidity for the quantification of reduced sulfur species in different aquatic environments, from freshwaters to saline and polluted systems.
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spelling doaj-art-5e2238e00ce84799872401fff4be9b5c2025-02-03T01:11:23ZengWileyJournal of Chemistry2090-90632090-90712019-01-01201910.1155/2019/10394871039487Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric MethodSébastien Dupraz0Bénédicte Ménez1François Guyot2Université de Paris, Institut de Physique du Globe de Paris, CNRS and Centre de Recherches sur le Stockage Géologique du CO2(IPGP/TOTAL/SCHLUMBERGER/ADEME), 1 Rue Jussieu, 75238 Paris Cedex 05, FranceUniversité de Paris, Institut de Physique du Globe de Paris, CNRS and Centre de Recherches sur le Stockage Géologique du CO2(IPGP/TOTAL/SCHLUMBERGER/ADEME), 1 Rue Jussieu, 75238 Paris Cedex 05, FranceInstitut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne-Université, IRD, Museum National d’Histoire Naturelle, CNRS, 4 Place Jussieu, 75252 Paris Cedex 05, FranceThe determination of reduced sulfur species in aquatic systems is not an easy and fast task to accomplish regarding the numerous possible interferences and risks of oxidation that occur with the usual methods of quantification. The method presented here is a direct spectrophotometric method that can be used to quantify sulfides, sulfites, and thiosulfates in a simple and rapid way. The principle is based on the comparison of second-derivative absorbance spectra of the same sample at different pH (9.2, 4.7, and 1.0) and selected absorption wavelengths (250 and 278 nm). This method has been successfully tested and has demonstrated liability to (i) avoid the biases due to absorbance overlaps between the different major chemical species and (ii) keep, as a direct method, the advantages over indirect methods on interferences reduction. The limits of detections (LOD) reached for total sulfide, sulfite, and thiosulfate are 1.37, 7.32, and 1.92 µM, respectively. The method displays low accuracy mean and low relative standard deviation (<4%) as well as a good linearity (R2 > 0.999). Accordingly, this method represents a very robust alternative in terms of cost and rapidity for the quantification of reduced sulfur species in different aquatic environments, from freshwaters to saline and polluted systems.http://dx.doi.org/10.1155/2019/1039487
spellingShingle Sébastien Dupraz
Bénédicte Ménez
François Guyot
Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
Journal of Chemistry
title Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
title_full Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
title_fullStr Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
title_full_unstemmed Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
title_short Fast Determination of the Main Reduced Sulfur Species in Aquatic Systems by a Direct and Second-Derivative Spectrophotometric Method
title_sort fast determination of the main reduced sulfur species in aquatic systems by a direct and second derivative spectrophotometric method
url http://dx.doi.org/10.1155/2019/1039487
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