Portable and rapid arsenic speciation in synthetic and natural waters by an As(V)-selective chemisorbent, validated against anodic stripping voltammetry
| Autor: | Aaron Torres-Huerta, Jay C. Bullen, Swachchha Majumdar, Pascal Salaün, Jonathan S. Watson, Ramon Vilar, Dominik J. Weiss |
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| Přispěvatelé: | Engineering and Physical Sciences Research Council |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Technology
0208 environmental biotechnology DRINKING-WATER 02 engineering and technology 010501 environmental sciences SPATIAL-ANALYSIS OXIDATION 01 natural sciences anodic stripping voltammetry chemistry.chemical_compound Engineering CONTAMINATED GROUNDWATER groundwater Waste Management and Disposal Water Science and Technology Arsenite RISK voltammetry Ecological Modeling SEAWATER Ion-exchange resin Pollution 6. Clean water SOLID-PHASE EXTRACTION Environmental chemistry Physical Sciences Water Resources Water treatment HEALTH Molecular recognition Life Sciences & Biomedicine Water contamination Environmental Engineering Environmental remediation Iron chemistry.chemical_element Environmental Sciences & Ecology arsenic speciation Genetic algorithm EXPOSURE FIELD Solid phase extraction Electrodes Arsenic 0105 earth and related environmental sciences Civil and Structural Engineering Science & Technology Arsenate Engineering Environmental arsenic groundwater contamination 020801 environmental engineering Anodic stripping voltammetry chemistry electrochemistry 13. Climate action Environmental science Seawater Environmental Sciences Water Pollutants Chemical |
| Zdroj: | WATER RESEARCH |
| Popis: | 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 the 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. |
| Databáze: | OpenAIRE |
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