Capillary gas chromatographic-mass spectrometric determination of acid herbicides in soils and sediments.
A capillary gas chromatographic method with selected-ion monitoring (GC-SIM) was applied to eight common herbicides: 2-(4-chloro-o-tolyl-oxy)propionic acid, 3,6-dichloro-2-methoxybenzoic acid, 2-methyl-4-chlorophenoxyacetic acid, 2,3,6-trichlorobenzoic acid, 2,4-dichlorophenoxyacetic acid, 3,5,6-trichloro-2-pyridyloxy-acetic acid, 2,4,5-trichlorophenoxyacetic acid and alpha-(2-methyl-4-chlorophenoxy) butyric acid. The method involves extraction with saturated calcium hydroxide solution, esterification with pentafluorobenzyl bromide, clean-up with a silica gel column and determination by capillary GC-SIM. Recoveries from soil and sediment are over 89% (with the exception of 77% for TBA) with coefficients of variation below 5% (n = 7). The method is suitable for the simultaneous determination of the eight herbicides in environmental samples with high sensitivity and accuracy.
Nagano Research Institute for Health and Pollution, Japan.
T
T
Tsukioka
T
T
Murakami
D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis*; D012987:Soil / Q000032:analysis*
D006540:Herbicides; D012987:Soil