Online Microdialysis-High-Performance Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry (MD-HPLC-ICP-MS) as a Novel Tool for Sampling Hexavalent Chromium in Soil Solution

Hamilton, Elliott M.; Young, Scott D.; Bailey, Elizabeth H.; Humphrey, Olivier S.; Watts, Michael J.

Abstract

© 2020 American Chemical Society. All rights reserved. Conventional soil solution sampling of species-sensitive inorganic contaminants, such as hexavalent chromium (CrVI), may induce interconversions due to disruption of system equilibrium. The temporal resolution that these sampling methods afford may also be insufficient to capture dynamic interactions or require time-consuming and expensive analysis. Microdialysis (MD) is emerging as a minimally invasive passive sampling method in environmental science, permitting the determination of solute fluxes and concentrations at previously unobtainable spatial scales and time frames. This article presents the first use of MD coupled to high-performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS) for the continuous sampling and simultaneous detection of CrVI in soil solution. The performance criteria of the system were assessed using stirred solutions; good repeatability of measurement (RSD < 2.5%) was obtained for CrVI, with a detection limit of 0.2 μg L-1. The online MD-HPLC-ICP-MS setup was applied to the sampling of native CrVI in three soils with differing geochemical properties. The system sampled and analyzed fresh soil solution at 15 min intervals, offering improved temporal resolution and a significant reduction in analysis time over offline MD. Simple modifications to the chromatographic conditions could resolve additional analytes, offering a powerful tool for the study of solute fluxes in soil systems to inform research into nutrient availability or soil-to-plant transfer of potentially harmful elements.

Citation

Hamilton, E. M., Young, S. D., Bailey, E. H., Humphrey, O. S., & Watts, M. J. (2021). Online Microdialysis-High-Performance Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry (MD-HPLC-ICP-MS) as a Novel Tool for Sampling Hexavalent Chromium in Soil Solution. Environmental Science and Technology, 55(4), 2422-2429. https://doi.org/10.1021/acs.est.0c08140

• Journal Article Type: Article
• Acceptance Date: Jan 11, 2021
• Online Publication Date: Jan 26, 2021
• Publication Date: Feb 16, 2021
• Deposit Date: Apr 25, 2021
• Publicly Available Date: Jan 27, 2022
• Journal: Environmental Science and Technology
• Print ISSN: 0013-936X
• Electronic ISSN: 1520-5851
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 55
• Issue: 4
• Pages: 2422-2429
• DOI: https://doi.org/10.1021/acs.est.0c08140
• Keywords: Environmental Chemistry; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/5356451
• Publisher URL: https://pubs.acs.org/doi/10.1021/acs.est.0c08140
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology,copyright© American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.0c08140