Application of a modified BCR sequential extraction (three-step) procedurefor the determination of extractable trace metal contents in a sewage sludge amended soil reference material (CRM 483), complemented by a three-year stability study of acetic acid and EDTA extractable metal content

This paper provides additional data on a sewage sludge amended soil certifi ed reference material, CRM 483, which was certified in 1997 for its EDTA an d acetic acid extractable contents of some trace metals, following standard ised extraction procedures. The additional work aimed to test the long-term stability of the material and the applicability of an improved version of the BCR three-step sequential extraction procedure on the sewage sludge ame nded soil (CRM 483). The paper demonstrates the CRM 483 long-term stability for EDTA and acetic acid extractable contents of Cd, Cr, Cu, Ni, Pb and Zn and gives the results (obtained in the framework of an interlaboratory stu dy) for the extractable contents of the same elements in the CRM 483, follo wing the BCR three-step sequential extraction scheme. The aqua regia extrac table contents following the ISO 11466 Standard are also given. The data ar e given as indicative (not certified) values.