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Determination of the Herbicide Dimethylamine Salt of 2,4‐Dichlorophenoxyacetic Acid in Surface Water
Author(s) -
Wilder Ernest T.
Publication year - 1968
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1968.tb03613.x
Subject(s) - diazomethane , dimethylamine , chemistry , 2,4 dichlorophenoxyacetic acid , chloride , chromatography , methylene , extraction (chemistry) , solvent , salt (chemistry) , petroleum ether , hexane , amine gas treating , ether , amberlite , methylene blue , nuclear chemistry , organic chemistry , adsorption , catalysis , botany , photocatalysis , biology
This study demonstrated that 95 to 100 per cent of the herbicide dimethyl amine salt of 2,4‐ dichlorophenoxyacetic acid was recovered from surface water by liquid‐liquid extraction with 75‐50‐50‐ml portions of methylene chloride as the solvent. The experimental approach consisted of evaporating the methylene chloride with diethyle ether or petroleum ether. Esterify with diazomethane and make up to a known volume with n‐hexane. Dimethylamine salts of 2,4‐D will dissipate in surface water if they are not extracted soon after collection, or if they are not kept at a low enough temperature. With this method of recovery, a determination of concentrations of 0.01 mg/l 2,4‐D can be obtained with the gas chromatograph electron capture detector.