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Colorimetric analysis of p ‐chlorobenzyl p ‐chlorophenyl sulphide (chlorbenside) residues in plant and animal tissue
Author(s) -
Higgons D. J.,
Kilbey D. W.
Publication year - 1955
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740060807
Subject(s) - chemistry , benzene , nitration , sodium , plant tissue , chromatography , environmental chemistry , organic chemistry , botany , biology
Abstract A method is described for the colorimetric analysis of residues of p ‐chlorobenzyl p ‐chlorophenyl sulphide on leaf and fruit samples and in animal tissue. The method is based on pre‐oxidation of the spray residues followed by intensive nitration of the resulting p ‐chlorobenzyl p ‐chlorophenyl sulphone, and the formation of a purple colour on interaction of the nitrated products in benzene with sodium methylate. The method is sensitive to 0.05 mg. and is specific in the presence of all likely contaminants except DDT.