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Veröffentlichung Round robin test for odour testing of migration waters(2015) Günther, Herbert; Rapp, ThomasFor a round robin test for EN 1420-1 (Odour assessment for organic materials in contact with drinking water) with 14 contributing laboratories from 10 European countries segments of a plastic pipe were sent to the laboratories which performed a migration test and an odour analysis of the migration waters (water that had contact with the organic material) according to the procedure described in the standard from 1999. In addition reference substances (Methyl tert-butyl ether, 1-butanol and hexanal) were investigated for their suitability to qualify the panels and the individual panellists. Methyl tert-butyl ether (MtBE) and 1-butanol proved to be suitable for this purpose, whereas hexanal showed a wide distribution of the individual odour threshold concentrations. Both possible testing options (unforced and forced choice) were performed and gave similar results. However, with respect to the qualification of the panellists and the data analysis the unforced choice procedure showed advantages. As human olfactory perception is used for the analysis, the reproducibility and the comparability between laboratories is of particular concern. For the pipe material the TON results of the different laboratories were in a range of ş1.5 dilutions based on a dilution factor of 2. This might be improved by taking the individual sensitivities of the panellists into account more strongly. Appropriate measures for the improvement of the test method appear to be the use of the proposed reference substances for the training of the panellists as well as the auditing and the selection of the panellists. The results of this round robin test are used in the revision process of the standard.Quelle: http://www.sciencedirect.comVeröffentlichung Results from a round robin test for the ecotoxicological evaluation of construction products using two leaching tests and an aquatic test battery(2017) Gartiser, Stefan; Brauer, Frank; Heisterkamp, Ines; Schoknecht, Ute; Ilvonen, OutiVeröffentlichung Validation of European horizontal methods for the analysis of PAH, PCB and dioxins in sludge, treated biowaste and soil(2019) Kalbe, Ute; Bandow, Nicole; Lehnik-Habrink, PetraBackground
Draft standards for the determination of organic pollutants in the solid matter of environmental matrices such as sludge, treated biowaste and soil have been basically developed in the framework of the European standardisation project HORIZONTAL. A research project financed by the German Federal Environment Agency was initiated to finalise some of these CEN standard drafts, since fully validated standard procedures are crucial for the evaluation of their reliability in the context of implementation in legislation on environmental health.Approach
Appropriate test materials (<2 mm particle size) were prepared and homogenised from contaminated soils, sludge and treated biowaste containing polycyclic aromatic hydrocarbons (PAH), polychlorinated biphenyls (PCB), dioxins, furans and dioxin-like-PCB and served, along with reference solutions, as the basis for international interlaboratory comparisons. Performance data of three analytical standard procedures were obtained by the statistical evaluation of results received from 11 to 29 participants per test material.Results
The overall variation coefficients of reproducibility (between-lab standard deviations) for the sum parameters were roughly between 10 and 35%. The variation coefficients of repeatability (within-lab standard deviations) range between 3 and 8% and show no trend considering the substance groups or matrices. The highest coefficients of reproducibility were found for the analysis of PAH, which were between 26 and 35%, depending on the matrix, whereas 7-17% reproducibility was observed for toxicity equivalents (TEQ) comprising dioxins, furans and dl-PCB.Conclusions
Overall, the results confirm that the procedures described in the Technical Specifications are fit for purpose for all three matrices and that the feasibility of the HORIZONTAL approach, to cover several matrices with one standard per analyte, was thereby proven. Quelle: https://enveurope.springeropen.com