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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
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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
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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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Organisation of the interlaboratory DGT exercise by IFREMER, October 2018

Organisation of the interlaboratory DGT exercise by IFREMER, October 2018

In the framework of the MONITOOL project, work package 5, it was decided to set up an intercomparison exercise on the treatment and analysis of DGTs after exposure.

The general objective of the exercise is to assess the potential function and the efficiency of DGTs for trace metals monitoring in surface and coastal waters in the context of the Water Framework Directive (WFD).

More specifically, the main technical and operational objectives of the interlaboratory exercise are:

  • identification of potential problems during recovery operations and elution of resins and improvement actions to be implemented;
  • evaluation of the choice of analytical methods (limits of quantification sufficient?) and validation of measurement uncertainties;
  • to evaluate the comparability and variability of measurements of different metals with DGTs;
  • to progress on the harmonization of practices for the use of DGTs especially for the analysis of trace metals in marine waters.

All packaging, immersion, recovery, processing and dispatch operations of the DGTs have been carried out by IFREMER.

10 laboratories participated in the exercise, each participant received "identical" samples exposed, recovered, processed and packaged under the same conditions (all DGTs used being from the same batch) consisting in:

  • Blank laboratory DGT
  • DGTs (immerged)
  • Resins (in an elution tube without acid)
  • Resins (in an elution tube with acid: HNO3 1M Suprapur: 1,22 mL)

All DGTs were exposed between 19-25 October 2018 in the Bay of Lazaret (French Mediterranean Sea coast). 

Exposition site for the Interlaboratories DGT exercise

Exposition site for the Interlaboratories DGT exercise


A total of 250 DGTs were used in the interlaboratory DGT exercise, being 180 exposed DGTs (1) and 70 blank laboratory DGTs.

It should be noted that some of the participating laboratories did not have prior experience with the processing and analysis of DGTs. This exercise should allow the various participating laboratories to assess the overall results obtained and, if necessary, conduct appropriate reflection to optimize their practices and ensure the quality of results.

DGTs recovery and processing

DGTs recovery and processing

Participating laboratories: DCU, ITC, IPMA, AZTI, 3 IFREMER labs (La Seyne/mer, Nantes and Port en Bessin), CEFAS, UNICA and The Scottish government.

(1) 102 DGTs were sent as they were collected (no manipulation); for 39 of them, it was sent only the chelex-100 resin; for the other 39, only the eluates were sent.