Journal
ENVIRONMENTAL POLLUTION
Volume 208, Issue -, Pages 299-308Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.08.049
Keywords
DGT; Uncertainty; Blank; Continental waters; Coastal waters
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Funding
- French National Agency for Water and Aquatic Environments (ONEMA, via AQUAREF)
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Passive sampling devices (PS) are widely used for pollutant monitoring in water, but estimation of measurement uncertainties by PS has seldom been undertaken. The aim of this work was to identify key parameters governing PS measurements of metals and their dispersion. We report the results of an in situ intercomparison exercise on diffusive gradient in thin films (DGT) in surface waters. Interlaboratory uncertainties of time-weighted average (TWA) concentrations were satisfactory (from 28% to 112%) given the number of participating laboratories (10) and ultra-trace metal concentrations involved. Data dispersion of TWA concentrations was mainly explained by uncertainties generated during DGT handling and analytical procedure steps. We highlight that DGT handling is critical for metals such as Cd, Cr and Zn, implying that DGT assembly/dismantling should be performed in very clean conditions. Using a unique dataset, we demonstrated that DGT markedly lowered the LOQ in comparison to spot sampling and stressed the need for accurate data calculation. (C) 2015 Elsevier Ltd. All rights reserved.
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