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Towards the Use of Dgt Technique in a Regulatory Context for Monitoring Metals in Marine Water Bodies: Results of an International Intercomparison Exercise

2022; RELX Group (Netherlands); Linguagem: Inglês

10.2139/ssrn.4106356

1556-5068

Jean‐Louis Gonzalez, Isabelle Amouroux, Stéphane Guesdon, Florence Menet-Nédélec, Emmanuel Ponzevera, Natalia Montero, Barbara Marras, Schintu Marco, Caetano Miguel, Correia Dos Santos Margarida, Marta Rodrigo Sanz, Millán Gabet Vanessa, José Germán Rodríguez, Belzunce-Segarra María Jesús, Joana Larreta, Menchaca Iratxe, Bersuder Philippe, Bolam Thi, Regan Fiona, Blánaid White, Hao Zhang,

Mercury impact and mitigation studies

In order to move forward in the acceptance of a novel contaminant monitoring technique (Diffusive Gradients in Thin-films: DGT) for the chemical assessment of marine water bodies, sensu the WFD, an Inter-Laboratories Comparison (ILC) exercise (nine Europeans laboratories) was organized in the framework of the Interreg Atlantic Area MONITOOL project, which focused on the use of DGT technique for the measurement of WFD priority metals (Cd, Ni and Pb). This ILC exercise was designed to identify the critical handling and analytical steps when working with DGT devices in order to establish recommendations to prevent misleading results.Results showed that reproducible concentrations were obtained for each metal by several laboratories and supports the assertion that DGT analysis can be performed satisfactorily by laboratories experienced in measuring metals at trace levels in marine environments, even if they have limited practice in DGT analysis.Among the 9 participating laboratories, 3 had 100% of satisfactory results for Cd, Ni, and Pb, 3 had more than 80% satisfactory results and 2 had about 60% satisfactory results.The study also showed that there was a trend of increasing variability in the results when increasing the number of steps in the DGT handling procedure.This work highlights the need to clearly describe the DGT method in order to control sources of contamination during analytical steps, in particular the resin gel retrieval and the elution steps.Such international intercomparison exercise is an important tool to develop the laboratory network involved in DGT analysis and contributes to the improvement of data quality.