Masking, chelation, and solvent extraction for the determination of sub-parts-per-Million levels of trace elements in high iron and salt matrices
作者： Mary Carol. Williams , Edward J. Cokal , Thomas M. Niemczyk
DOI: 10.1021/AC00298A061
关键词:
摘要: The ammonium pyrrolidine-N-carbodithioate (APCD or APDC) and a 4-methyl-2-pentanone (methyl isobutyl ketone MIBK) system for the chelation extraction of transition metals was investigated over pH range 0 < 12. This eliminated interferences associated with high total dissolved solids. masking effects citrate Tiron (4,5-dihydroxybenzene-1,3-disulfonic acid) were Cd/sup 2 +/, Co/sup Cu/sup Cr/sup 3 6 Hg/sup Ni/sup Pb/sup Tl/sup Zn/sup +/. Iron effectively masked by above 8.0 6.5, respectively. All investigated, except +/ efficiently extracted APCD-MIBK system. addition NaCl as salting-out agent made it possible to concentrate from 20 volumes aqueous sample into one volume organic solvent. enabled be determined at parts-per-billion level flame atomic absorption spectroscopy.
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