The Standards, Measurements and Testing Programme (formerly BCR) of the European Commission proposed a
three-step sequential extraction procedure for sediment analysis, following extensive expert consultations and two
interlaboratory studies. This scheme was recently used to certify the extractable trace element contents of a sediment
reference material (CRM 601). Although this procedure offers a means to ensure the comparability of data in this
field, some difficulties concerning the interlaboratory reproducibility still remain, and a new project is currently
being conducted to determine the causes of poor reproducibility in the extraction scheme. The final objective of the
project is the certification of new sediment and soil reference materials for their extractable contents of Cd, Cr, Cu,
Ni, Pb and Zn. This paper presents the results of a small-scale interlaboratory study, which aimed to test a revised
version of the extraction schemes by comparing the original and the modified protocols using the CRM 601 sample.
This work offers an improvement to the BCR sequential extraction procedure through intercomparison exercises.
This improved procedure will allow the obtaining of CRMs to validate analytical data in the analysis of soils and
sediments, and it will also facilitate comparability of data in the European Union.
The Standards, Measurements and Testing Programme (formerly BCR) of the European Commission proposed a
three-step sequential extraction procedure for sediment analysis, following extensive expert consultations and two
interlaboratory studies. This scheme was recently used to certify the extractable trace element contents of a sediment
reference material (CRM 601). Although this procedure offers a means to ensure the comparability of data in this
field, some difficulties concerning the interlaboratory reproducibility still remain, and a new project is currently
being conducted to determine the causes of poor reproducibility in the extraction scheme. The final objective of the
project is the certification of new sediment and soil reference materials for their extractable contents of Cd, Cr, Cu,
Ni, Pb and Zn. This paper presents the results of a small-scale interlaboratory study, which aimed to test a revised
version of the extraction schemes by comparing the original and the modified protocols using the CRM 601 sample.
This work offers an improvement to the BCR sequential extraction procedure through intercomparison exercises.
This improved procedure will allow the obtaining of CRMs to validate analytical data in the analysis of soils and
sediments, and it will also facilitate comparability of data in the European Union.
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