Publication Type Journal Article
Title Assessing variability in the ratio of metal concentrations measured by DGT-type passive samplers and spot sampling in European seawaters
Authors Jose German Rodriguez Isabelle Amouroux Maria Jesus Belzunce-Segarra Philippe Bersuder Thi Bolam Miguel Caetano Inês Carvalho Margarida Correia dos Santos Gary R. Fones Jean-Louis Gonzalez Stephane Guesdon Joana Larreta Barbara Marras Brendan McHugh Florence Menet-Nedelec Iratxe Menchaca Vanessa Millan Gabet Natalia Montero Martin Nolan Fiona Regan Craig D. Robinson Nuno Rosa Marta Rodrigo Sanz Marco Schintu Blanaid White Hao Zhang
Groups Chem4Env
Journal SCIENCE OF THE TOTAL ENVIRONMENT
Year 2021
Month
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Volume 783
Number
Pages
Abstract The current study evaluates the effect of seawater physico-chemical characteristics on the relationship between the concentration of metals measured by Diffusive Gradients in Thin films (DGT) passive samplers (i.e., DGTlabile concentration) and the concentrations measured in discrete water samples. Accordingly, Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to measure the total dissolved metal concentrations in the discrete water samples and the labile metal concentrations obtained by DGT samplers; additionally, lead and cadmium conditional labile fractions were determined by Anodic Stripping Voltammetry (ASV) and total dissolved nickel was measured by Cathodic Stripping Voltammetry (CSV). It can be concluded that, in general, the median ratios of DGT/ICP and DGT/ASV(CSV) were lower than 1, except for Ni (median ratio close to 1) and Zn (higher than 1). This indicates the importance of speciation and time-integrated concentrations measured using passive sampling techniques, which is in line with the WFD suggestions for improving the chemical assessment of waterbodies. It is the variability in metal content in waters rather than environmental conditions to which the variability of the ratios can be attributed. The ratios were not significantly affected by the temperature, salinity, pH, oxygen, DOC or SPM, giving a great confidence for all the techniques used. Within a regulatory context such as the EU Water Framework Directive this is a great advantage, since the simplicity of not needing to use corrections to minimize the effects of environmental variables could help in implementing DGTs within monitoring networks. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/). the discrete water samples and the labile metal concentrations obtained by DGT samplers; additionally, lead and cadmium conditional labile fractions were determined by Anodic Stripping Voltammetry (ASV) and total dissolved nickel was measured by Cathodic Stripping Voltammetry (CSV). It can be concluded that, in general, the median ratios of DGT/ICP and DGT/ASV(CSV) were lower than 1, except for Ni (median ratio close to 1) and Zn (higher than 1). This indicates the importance of speciation and time-integrated concentrations measured using passive sampling techniques, which is in line with the WFD suggestions for improving the chemical assessment of waterbodies. It is the variability in metal content in waters rather than environmental conditions to which the variability of the ratios can be attributed. The ratios were not significantly affected by the temperature, salinity, pH, oxygen, DOC or SPM, giving a great confidence for all the techniques used. Within a regulatory context such as the EU Water Framework Directive this is a great advantage, since the simplicity of not needing to use corrections to minimize the effects of environmental variables could help in implementing DGTs within monitor
DOI http://dx.doi.org/10.1016/j.scitotenv.2021.147001
ISBN
Publisher
Book Title
ISSN 0048-9697
EISSN 1879-1026
Conference Name
Bibtex ID WOS:000656998500013
Observations
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