Interlaboratory comparison to evaluate the precision of test methods for the assessment of the release of inorganic substances from construction products
Horizontal dynamic surface leaching test CEN/TS 16637-2,
horizontal up-flow percolation test CEN/TS 16637-3,
analysis of inorganic substances in eluates CEN/TS 17195
and analysis of aqua regia digests CEN/TS 17201
The Joint Research Centre (JRC) organised the interlaboratory validation of methods developed by the European Committee for Standardization (CEN) on leaching, content and eluate analysis procedures to assess the release of inorganic hazardous substances from construction products. This work was done in support of the Regulation 305/2011/EU (Construction Products Regulation).
The CEN Technical Committee 351 Construction Products - Assessment of release of dangerous substances had the mandate to develop leaching procedures and procedures to analyse the leachates for organic and inorganic substances, taking into account the intended conditions of use of the product. It is split into several working groups (WGs); among them, WG1 focuses on "Release from construction products into soil, ground water and surface water" and it has developed horizontal leaching and percolation procedures; and WG5 focuses on "Content and Eluate analysis" and it has developed horizontal standardized procedures for the analysis of leachates/eluates and content analysis.
This interlaboratory test was open to expert laboratories from all Member States. The materials, analytes and validation plans were agreed by CEN/TC351. Raw materials were obtained from industry providers and further processed at the JRC premises in Geel. Additionally leachates and eluates were prepared in-house following CEN/TS 16637-2 and 3.
23 laboratories from seven countries registered to the test and reported results. 13 – 18 laboratories participated in leaching/percolation test and 12-16 laboratories in leachate analysis or total content analysis. Repeatability and reproducibility of the reported results were evaluated according to ISO 5725-2 and using ProLab software. For the dynamic surface leaching test and up-flow percolation test, repeatability standard deviations (RSDr) and reproducibility standard deviations (RSDR) were 20-40 % and 40-65 %, respectively, except for the monolithic copper slag which showed higher variations. These standard deviations also account for homogeneity of the materials. For the analysis of aqua regia digests and eluates, RSDr were <5 % and RSDR were <25 %, showing that the final quantification plays a minor role in the variation of results.
The release of organic hazardous substances from construction products will be tested at a later stage.
GARCIA RUIZ Silvia;
LINSINGER Thomas;
CORDEIRO RAPOSO Fernando;
CONNEELY Patrick;
EMTEBORG Hakan;
HELD Andrea;
2020-02-27
Publications Office of the European Union
JRC119719
978-92-76-10226-7 (online),
1831-9424 (online),
EUR 30071 EN,
OP KJ-NA-30071-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC119719,
10.2760/288988 (online),
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