Portable and rapid arsenic speciation in synthetic and natural waters by an As(V)-selective chemisorbent, validated against anodic stripping voltammetry
File(s)
Accepted version
Accepted version
Author(s)
Type
Journal Article
Abstract
Inorganic arsenic speciation, i.e. the differentiation between arsenite and arsenate, is an important step for any program aiming to address the global issue of arsenic contaminated groundwater, whether for monitoring purposes or the development of new water treatment regimes. Reliable speciation by easy-to-use, portable and cost-effective analytical techniques is still challenging for both synthetic and natural waters. Here we demonstrate the first application of an As(V)-selective chemisorbent material for simple and portable speciation of arsenic using handheld syringes, enabling high sample throughput with minimal set-up costs. We first show that ImpAs efficiently removes As(V) from a variety of synthetic groundwaters with a single treatment, whilst As(III) is not retained. We then exemplify the potential of ImpAs for simple and fast speciation by determining rate constants for the photooxidation of As(III) in presence of a TiO2 photocatalyst. Finally, we successfully speciate natural waters spiked with a mix of As(III) and As(V) in both Indian and UK groundwaters with less than 5 mg L−1 dissolved iron. Experimental results using ImpAs agreed with anodic stripping voltammetry (ASV), a benchmark portable technique, with analysis conditions optimised here for the groundwaters of South Asia. This new analytical tool is simple, portable and fast and should find applications within the overall multi-disciplinary remediation effort that is taking place to tackle this worldwide arsenic problem.
Date Issued
2020-05-15
Date Acceptance
2020-02-23
Citation
Water Research, 2020, 175, pp.1-11
ISSN
0043-1354
Publisher
Elsevier BV
Start Page
1
End Page
11
Journal / Book Title
Water Research
Volume
175
Copyright Statement
© 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering and Physical Sciences Research Council
Identifier
https://www.sciencedirect.com/science/article/pii/S004313542030186X
Grant Number
EP/N509486/1
Subjects
Science & Technology
Technology
Life Sciences & Biomedicine
Physical Sciences
Engineering, Environmental
Environmental Sciences
Water Resources
Engineering
Environmental Sciences & Ecology
Groundwater
Water contamination
Ion-exchange resin
Electrochemistry
Molecular recognition
Solid phase extraction
SOLID-PHASE EXTRACTION
CONTAMINATED GROUNDWATER
SPATIAL-ANALYSIS
DRINKING-WATER
FIELD
OXIDATION
EXPOSURE
SEAWATER
HEALTH
RISK
Electrochemistry
Groundwater
Ion-exchange resin
Molecular recognition
Solid phase extraction
Water contamination
Arsenic
Electrodes
Groundwater
Iron
Water Pollutants, Chemical
Arsenic
Iron
Water Pollutants, Chemical
Electrodes
Groundwater
Environmental Engineering
Publication Status
Published online
Date Publish Online
2020-02-28