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Screening a Selective Chelator Pair for Simultaneous Determination of Iron(II) and Iron(III)
Author(s) -
Wang Tiangen,
Peverly John H.
Publication year - 1998
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1998.03615995006200030009x
Subject(s) - ethylenediamine , extraction (chemistry) , chemistry , chelation , metal , salt (chemistry) , oxidation state , oxidation reduction , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , environmental chemistry , chromatography , organic chemistry , biochemistry
Direct determination of Fe(II) and Fe(III) is a fundamental technology for environmental Fe chemistry research. The key to accurate determination of Fe(II) and Fe(III) in soil, water, and plant samples is to stabilize Fe oxidation states during Fe extraction and analysis, but the goal has only been partially achieved in previous research. In this research, an approach to stabilizing the original oxidation states of Fe during extraction and analysis was studied. The following sequential procedures were conducted: computer simulation → colorimetric tests → Fe(III) reduction resistance tests → metal interference tests → sensitivity tests → determination of optimal pH for Fe extraction. Results indicated that EDTA (ethylenediamine‐ N,N,N′,N′ ‐tetraacetate, disodium salt) and BPDS (bathophenanthroline disulfonate, disodium salt) were the most effective chelator pair with which to stabilize Fe oxidation states and that they may allow accurate, simultaneous determination of Fe(II) and Fe(III).