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IPMA complete metal analysis in seawater samples
UNICA (University of Cagliari) organized a conference the 20 June 2019 in Cagliari
Data Quality Assurance: a holistic view
DGT Conference 2019 will be the fifth international scientific event with MONITOOL presence in 2019
MONITOOL partners share results and plan next steps in Gran Canaria
Technical conferences present MONITOOL project and DGT passive sampling in Canary Islands
Interview with Thi Bolam, leader of MONITOOL Work Package 5
ITC will organize 2 technical conferences in the days preceding the next partners´ meeting in Canary Islands
UNICA promotes the application of the MONITOOL approach for other organic compounds
DCU analyses biofouling on MONITOOL DGTs
Organisation of the interlaboratory DGT exercise by IFREMER, October 2018
Database Management and correlation studies. First promising results.
Interview with Dr. Blánaid White, coordinator of Interreg founded MONITOOL project
MONITOOL partners discuss project´s first results in AZTI, San Sebastián
AZTI hosts 3rd MONITOOL meeting in San Sebastian
DGT extraction and metal analysis by IFREMER
Determination of lead and cadmium labile fraction by Anodic Stripping Voltammetry and total dissolved Nickel Cathodic Stripping Voltammetry
Last EEA report shows the importance of Water Framework Directive (WFD) to keep and improve waters quality in Europe
MONITOOL Project analyses its winter samples and obtains their first results
Sampling and sample processing and analysis WP5 protocols development
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Data Quality Assurance: a holistic view

Data Quality Assurance: a holistic view

The significant number of Diffusive Gradient in Thin films (DGTs) passive samplers and spot samples collected during the Winter and Summer Seasons campaigns were transported during 2018 to designated MONITOOL partner laboratories for the analysis of a range of heavy metals, including lead, cadmium and nickel which are regulated under the EU Water Framework Directive.

IFREMER [1] was responsible for the analysis of DGTs, while the filtered spot samples were being analysed by IPMA[2] using inductively coupled plasma mass spectrometry (ICP-MS) and IST[3] using voltammetry. Each type of analyses was purposely carried out by one specific laboratory in order to minimise inter-laboratory variability and therefore limit analytical uncertainty that would be naturally bigger if several laboratories were to carry out the same analysis on their respective samples.

CEFAS september 2019

Each partner laboratory responsible for the analysis of samples followed comprehensive and stringent Quality Control procedures to ensure that laboratory results generated are as true as possible and not subject to contamination from the laboratory itself. These quality control procedures do not however fully preclude the odd analytical errors or a contamination in a particular sample. Having analytical data generated by 3 different methods for each location gave the opportunity to have an additional and more holistic level of Quality Assurance.

With over 1,200 laboratory analyses completed by June 2019, Cefas[4] coordinated the review of the “raw” data generated by all three partner laboratories. For this, analytical results obtained for DGTs, spot samples by ICP-MS and voltammetry were compared in order to identify outliers across the 3 sets of data. Outliers were also evaluated within each set of data generated by a particular laboratory using “expert judgment” for water samples or by statistical means devised by IFREMER for DGTs. Where potential outliers were identified, each partner laboratory was tasked to double-check their raw data.

These treated datasets were subsequently distributed to each partner for final sound-checking of their own samples, applying their local knowledge of expected concentrations. Both “treated” and “non-treated” datasets were finally submitted to AZTI[5] who are now in the process to carry out the statistical analysis of both sets of results in order to establish whether a relationship between heavy metal concentrations in DGTs and spot samples can be defined.

[1] Institut Français de Recherche pour l'Exploitation de la Mer, France

[2] Instituto Português do Mar e da Atmosfera, Portugal

[3] Instituto Superior Técnico, Portugal

[4] Centre for Environment, Fisheries and Aquaculture Science, UK

[5] Fundación AZTI, Spain