35 research outputs found
Concurrent sampling of transitional and coastal waters by Diffusive Gradient in Thin-films (DGT) and spot sampling for trace metals analysis
This protocol was developed based on the knowledge acquired in the framework of the Interreg MONITOOL project (EAPA_565/2016) where extensive sampling campaigns were performed in transitional and coastal waters covering eight European countries. It provides detailed procedures and guidelines for the sampling of these waterbodies by concurrent collection of discrete water samples and the deployment of Diffusive Gradient in Thin-films (DGT) passive samplers for the measurement of trace metal concentrations. In order to facilitate the application of this protocol by end-users, it presents steps to follow in the laboratory prior to sampling campaigns, explains the procedures for field campaigns (including in situ measurement of supporting parameters) and subsequent sample processing in the laboratory in preparation for trace metal analyze by inductively coupled plasma-mass spectrometry (ICP-MS) and voltammetry. The protocol provides a systematic, coherent field sampling and sample preparation strategy that was developed in order to ensure comparability and reproducibility of the data obtained from each project Partner in different regions. âą Standardization of the concurrent sampling of transitional and coastal waters by DGT passive samplers and spot sampling. âą Robust procedures and tips based on existing international standards and comprehensive practical experience. âą Links to demonstration videos produced within the MONITOOL project
Assessing variability in the ratio of metal concentrations measured by DGT-type passive samplers and spot sampling in European seawaters
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., DGT-labile 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
Levels and trends of HBCD and BDEs in the European and Asian environments, with some information for other BFRs
A Significant Downturn in Levels of Hexabromocyclododecane in the Blubber of Harbor Porpoises ( Phocoena phocoena
Concurrent sampling of transitional and coastal waters by diffusive gradient in thin-films (DGT) and spot sampling for trace metals analysis
This protocol was developed based on the knowledge acquired in the framework of the Interreg MONITOOL project (EAPA_565/2016) where extensive sampling campaigns were performed in transitional and coastal waters covering eight European countries. It provides detailed procedures and guidelines for the sampling of these waterbodies by concurrent collection of discrete water samples and the deployment of Diffusive Gradient in Thin-films (DGT) passive samplers for the measurement of trace metal concentrations. In order to facilitate the application of this protocol by end-users, it presents steps to follow in the laboratory prior to sampling campaigns, explains the procedures for field campaigns (including in situ measurement of supporting parameters) and subsequent sample processing in the laboratory in preparation for trace metal analyze by inductively coupled plasma-mass spectrometry (ICP-MS) and voltammetry. The protocol provides a systematic, coherent field sampling and sample preparation strategy that was developed in order to ensure comparability and reproducibility of the data obtained from each project Partner in different regions. âą Standardization of the concurrent sampling of transitional and coastal waters by DGT passive samplers and spot sampling. âą Robust procedures and tips based on existing international standards and comprehensive practical experience. âą Links to demonstration videos produced within the MONITOOL project
Proteomic identification of antioxidant peptides from 400 to 2500Da generated in Spanish dry-cured ham contained in a size-exclusion chromatography fraction
Guide des bonnes pratiques pour lâutilisation des DGTs. Ăchantillonnage des mĂ©taux dans les eaux de transition et cĂŽtiĂšres par la technique du Gradient de Diffusion en couche mince (DGT). Projet MONITOOL
Le prĂ©sent document fournit des instructions pour les meilleures pratiques relatives Ă lâutilisation des Ă©chantillonneurs passifs Ă Gradient de Diffusion en couche mince (DGT) pour lâĂ©chantillonnage des eaux de transition et cĂŽtiĂšres Ă des fins de surveillance de la qualitĂ© de lâeau. La mĂ©thodologie dĂ©finie dans ce guide a Ă©tĂ© dĂ©veloppĂ©e par le consortium du projet Interreg MONITOOL de lâUnion europĂ©enne afin dâassurer la comparabilitĂ© et la reproductibilitĂ© des donnĂ©es obtenues par chaque partenaire du projet dans les diffĂ©rentes rĂ©gions. Le guide fournit des informations pratiques et dĂ©taillĂ©es sur tous les aspects Ă prendre en considĂ©ration avant le dĂ©ploiement de ces dispositifs et lors des Ă©tapes essentielles aprĂšs leur dĂ©ploiement, extraction et trai - tement ultĂ©rieur des Ă©chantillons pour lâanalyse des mĂ©taux traces. Bien quâil ne sâagisse pas dâun protocole standard, ces lignes directrices abordent la nĂ©cessitĂ© dâune approche commune et lâintention de promouvoir les meilleures pratiques
A Good Practice Guide for the Use of DGTs. Sampling of metals in transitional and coastal waters by Diffusive Gradient in Thin films (DGT) technique. MONITOOL project
This document provides guidance on best practice for the use of Diffusive Gradient in Thin films (DGT) passive samplers devices in sampling of transitional and coastal waters for water quality monitoring. The methodology1 to be addressed in this guide was developed by the consortium of the European Unionâs Interreg MONITOOL Project in order to ensure comparability and reproducibility of the data obtained from each project Partner in different regions. The guide provides practical and detailed information on all the aspects to be considered before the deployment of these devices and the essential steps for their deployment, retrieval and subsequent sample processing for the analysis of trace metals. Although it is not aimed as a standard protocol, these guidelines address the need for a common approach and the intention to promote best practice
Organochlorine pesticides and chlorobiphenyls in the blubber of bycaught female common dolphins from England and Wales from 1992â2006
A Good Practice Guide for the Use of DGTs. Sampling of metals in transitional and coastal waters by Diffusive Gradient in Thin films (DGT) technique
This good practice guide is focused on the DGT devices, which are the most widely used passive sampler for metals, covering the following aspects:â Principleâ Handling passive sampling devices for metalsâ Estimation of appropriate field deployment timeâ A Good Practice Guide for the Use of DGTsâ Passive sampling device preparation and assemblyâ Selection of sampling site and safety precautionsâ Passive sampling device deployment and retrievalâ Extraction of analytes from passive sampling devicesâ Analysisâ Calculation