SEARCH Articles Figures Tables BCR sequential extraction procedure Sequential Causality Assignment Procedure Sequential Causality Assignment Procedure SCAP) Sequential constructs procedure Sequential experimental procedure Sequential extraction procedures Sequential extraction procedures Tessier Sequential extraction procedures applications Sequential extraction procedures comparing Sequential extraction procedures examples Sequential extraction procedures microwave heating Sequential extraction procedures modification Sequential extraction procedures sewage sludge Sequential extraction procedures soil-sediment Sequential extraction procedures specificity Sequential iterative procedure Sequential leaching procedures The BCR sequential extraction procedure