Premium
The microestimation of γ‐(4‐chloro‐2‐methylphenoxy)butyric acid, γ‐(2 : 4‐dichlorophenoxy)butyric acid, and n‐butyl γ‐(2:4‐dichlorophenoxy)butyrate in plant material
Author(s) -
Glastonbury H. A.,
Stevenson Margaret D.
Publication year - 1959
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.2740100705
Subject(s) - butyric acid , residue (chemistry) , chemistry , isotope dilution , chromatography , food science , organic chemistry , mass spectrometry
As residue data on the persistence of herbicides are required for crops grown for human or animal consumption, a method has been developed for the determination of phenoxyalkane carboxylic acid and ester residues in plant material. This rapid, specific and sensitive method is described with special reference to the determination of 2 : 4‐DB and its butyl ester in lucerne and MCPB in pea plants. The sodium salts of the acids were always used in the formulations of 2 : 4‐DB and MCPB sprayed in field experiments. A radioactive isotope dilution technique is used to obtain quantitative results from non‐quantitative procedures and infra‐red spectroscopic analysis gives the necessary specificity. The sensitivity is I p.p.m. of the acids for a maximum sample weight of zoo g. and 2 p.p.m. of ester for a maximum sample weight of 50 g. The method has been applied in field experiments The results of other field experiments are being published in the Proceedings of the Fourth British Weed Control Conference, 1958. on residue levels and one typical series of results is given.