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Speciation Analysis of Cr(VI) and Cr(III) in Water with Surface-Enhanced Raman Spectroscopy
[Image: see text] Identifying and quantifying chromium in water are important for the protection of precious water resources from chromium pollution. Standard methods however are unable to easily distinguish toxic hexavalent chromium, Cr(VI), from innocuous trivalent chromium, Cr(III), are time-cons...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7841920/ https://www.ncbi.nlm.nih.gov/pubmed/33521444 http://dx.doi.org/10.1021/acsomega.0c05020 |
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author | Dvoynenko, Olga Lo, Shih-Lin Chen, Yi-Ju Chen, Guan Wei Tsai, Hsin-Mei Wang, Yuh-Lin Wang, Juen-Kai |
author_facet | Dvoynenko, Olga Lo, Shih-Lin Chen, Yi-Ju Chen, Guan Wei Tsai, Hsin-Mei Wang, Yuh-Lin Wang, Juen-Kai |
author_sort | Dvoynenko, Olga |
collection | PubMed |
description | [Image: see text] Identifying and quantifying chromium in water are important for the protection of precious water resources from chromium pollution. Standard methods however are unable to easily distinguish toxic hexavalent chromium, Cr(VI), from innocuous trivalent chromium, Cr(III), are time-consuming, or require large sample quantity. We show in this report that Cr(VI) and Cr(III) in water can be differentiated based on their distinct spectral features of surface-enhanced Raman scattering (SERS). Their SERS signals exhibit different pH dependences: the SERS features of Cr(VI) and Cr(III) are most prominent at pH values of 10 and 5.5, respectively. The obtained limit of detection of Cr(VI) in water is below 0.1 mg/L. Both concentration curves of their SERS signals show Langmuir sorption isotherm behavior. A procedure was developed to quantify Cr(VI) concentration based on the direct retrieval or addition method with an error of 10%. Finally, the SERS detection of Cr(VI) is shown to be insensitive to co-present Cr(III). The developed SERS procedure offers potential to monitor toxic chromium in fields. |
format | Online Article Text |
id | pubmed-7841920 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-78419202021-01-29 Speciation Analysis of Cr(VI) and Cr(III) in Water with Surface-Enhanced Raman Spectroscopy Dvoynenko, Olga Lo, Shih-Lin Chen, Yi-Ju Chen, Guan Wei Tsai, Hsin-Mei Wang, Yuh-Lin Wang, Juen-Kai ACS Omega [Image: see text] Identifying and quantifying chromium in water are important for the protection of precious water resources from chromium pollution. Standard methods however are unable to easily distinguish toxic hexavalent chromium, Cr(VI), from innocuous trivalent chromium, Cr(III), are time-consuming, or require large sample quantity. We show in this report that Cr(VI) and Cr(III) in water can be differentiated based on their distinct spectral features of surface-enhanced Raman scattering (SERS). Their SERS signals exhibit different pH dependences: the SERS features of Cr(VI) and Cr(III) are most prominent at pH values of 10 and 5.5, respectively. The obtained limit of detection of Cr(VI) in water is below 0.1 mg/L. Both concentration curves of their SERS signals show Langmuir sorption isotherm behavior. A procedure was developed to quantify Cr(VI) concentration based on the direct retrieval or addition method with an error of 10%. Finally, the SERS detection of Cr(VI) is shown to be insensitive to co-present Cr(III). The developed SERS procedure offers potential to monitor toxic chromium in fields. American Chemical Society 2021-01-08 /pmc/articles/PMC7841920/ /pubmed/33521444 http://dx.doi.org/10.1021/acsomega.0c05020 Text en © 2021 The Authors. Published by American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Dvoynenko, Olga Lo, Shih-Lin Chen, Yi-Ju Chen, Guan Wei Tsai, Hsin-Mei Wang, Yuh-Lin Wang, Juen-Kai Speciation Analysis of Cr(VI) and Cr(III) in Water with Surface-Enhanced Raman Spectroscopy |
title | Speciation Analysis of Cr(VI) and Cr(III) in Water
with Surface-Enhanced Raman Spectroscopy |
title_full | Speciation Analysis of Cr(VI) and Cr(III) in Water
with Surface-Enhanced Raman Spectroscopy |
title_fullStr | Speciation Analysis of Cr(VI) and Cr(III) in Water
with Surface-Enhanced Raman Spectroscopy |
title_full_unstemmed | Speciation Analysis of Cr(VI) and Cr(III) in Water
with Surface-Enhanced Raman Spectroscopy |
title_short | Speciation Analysis of Cr(VI) and Cr(III) in Water
with Surface-Enhanced Raman Spectroscopy |
title_sort | speciation analysis of cr(vi) and cr(iii) in water
with surface-enhanced raman spectroscopy |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7841920/ https://www.ncbi.nlm.nih.gov/pubmed/33521444 http://dx.doi.org/10.1021/acsomega.0c05020 |
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