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HERO ID
4845148
Reference Type
Journal Article
Title
Optimisation of laboratory arsenic analysis for groundwaters of West Bengal, India and possible water testing strategy
Author(s)
Kundu, AK; Majumder, S; Biswas, A; Bhowmick, S; Pal, C; Mukherjee, A; Majumder, M; Chatterjee, D
Year
2018
Is Peer Reviewed?
Yes
Journal
International Journal of Environmental Analytical Chemistry
ISSN:
0306-7319
EISSN:
1029-0397
Volume
98
Issue
5
Page Numbers
440-452
DOI
10.1080/03067319.2018.1477136
Web of Science Id
WOS:000436004900004
Abstract
Regular monitoring of arsenic (As) in groundwater is crucial from public health perspectives as millions of people are suffering due to use of contaminated aquifer water for drinking purposes. The routine analyses, especially in developing nations, are mostly done in localised government/non-government laboratories with limited resources, having the target of analysing large number of samples in each run. Thus apart from analytical sensitivity, cost-effectiveness of the method and eco-friendliness of the experimental operation are key surreptitious factors. This demands optimisation of total As measurement methods and finding a method that gives optimum benefit' considering all these factors together. The present study therefore evaluates four common As (total) measurement methods [iodometric-colorimetric method, silver diethyl dithiocarbamate method, molybdenum blue method and hydride generation atomic absorption spectrophotometric (HG-AAS) method] practised in the Bengal Delta Plain, in view of their analytical sensitivity, related environmental hazard and experimental costs. It was found that the HG-AAS method is analytically more sensitive, whereas the iodometric-colorimetric method and the molybdenum blue method are better choices in terms of eco-friendliness and cost-effectiveness, respectively. However, when all three factors (analytical reliability, environmental hazard and cost) are considered simultaneously, the molybdenum blue method was found to be placed first in the optimum performance rank' list. It was also found that both environmental hazard and cost play a more crucial role than analytical reliability, although this is case specific and would differ from place to place around the globe. Finally based on the results, we have hypothesised a water testing strategy for developing countries such as India where the molybdenum blue method can be adapted as a screening method and later the HG-AAS method can be used to precisely identify the groundwater samples with As concentration below the WHO drinking water guideline value of 10g/L.
Keywords
Groundwater; arsenic; spectrophotometric methods; HG-AAS; Spearman's rank correlation coefficient
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Molybdenum
Litsearch 2018
WOS
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