Gas-liquid chromatographic determination of sodium 5-[2-chloro-4- (trifluoromethyl) phenoxy]-2-nitrobenzoate residues on soybeans and foliage, soil, milk, and liver
Alder, I.L.; Augenstein, L.L.; Rogerson, T.D.
Journal - Association of Official Analytical Chemists 61(6): 1456-1458
1978
ISSN/ISBN: 0004-5756 PMID: 569657 Document Number: 135479
Residues of sodium 5- [2-chloro-4-(trifluoromethyl) phenoxy] -2-nitrobenzoate and its free acid are determined by treating a sample extract with diazomethane to convert the residues to methyl 5- [2-chloro-4-(trifluoromethyl)phenoxy] -2-nitrobenzoate. This compound is purified by chromatography on Florisil and measured by electron capture gas-liquid chromatography. The method has been used on soybeans, soybean foliage, soil, milk, and liver. It can detect 0.01 ppm with recoveries of 70–75%.