Detection and identification of the herbicide isoproturon and its metabolites in field samples after a heavy rainfall event

被引:23
作者
Schuelein, J
Glaessgen, WE
Hertkorn, N
Schroeder, P
Sandermann, H
Kettrup, A
机构
[1] INST OKOL CHEM,D-85764 OBERSCHLEISSHEIM,GERMANY
[2] INST BIOCHEM PFLANZENPATHOL,D-85764 OBERSCHLEISSHEIM,GERMANY
[3] TU WEIHENSTEPHAN,LEHRSTUHL OKOL CHEM & UMWELTANALYT,D-85350 FREISING,GERMANY
关键词
isoproturon; metabolites; mobility; rainfall; soil solution; surface water;
D O I
10.1080/03067319608045554
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The occurence of isoproturon [N-(4-isopropylphenyl)-N`, N`-dimethyl urea] and its metabolites was investigated in soil solution, runoff and creek water from a farm in Scheyern (Bavaria, FRG) after a heavy rainfall event following the application in spring 1994. The analytical procedure included enrichment by C 18 solid-phase extraction and reversed-phase HPLC with diode army detection. The major degradation product in most of the samples was identified as 2-hydroxy-isoproturon [N-(4-(2-hydroxyisopropyl)-phenyl)-N`, N`-dimethyl urea] using the authentic compound. The latter has been isolated from wheat cell culture medium and its structure elucidated by NMR and MS. Furthermore, the polar metabolites monodesmethyl-isoproturon [N-(4-Isopropylphenyl)-N`-T-methyl urea] and 2-hydroxy-monodesmethyl-isoproturon [N-(4-Isopropylphenyl)-N'-methyl urea] and 2-hydroxy-monodesmethyl-isoproturon [N-(4-(2-hydroxyisopropyl)-phenyl)-N'-methyl urea] were identified by comparison of their retention times and DAD-UV spectra with reference compounds. The detection of isoproturon in soil solution down to 170 cm depth and in creek water in concentrations exceeding 4 mu g/l and also of the polar metabolites in concentrations up to 0,9 mu g/l indicated the mobility of this phenylurea herbicide and its degradation products. Therefore the metabolites should be considered in studies on the migration of isoproturon and in the ecotoxicological evaluation.
引用
收藏
页码:193 / 202
页数:10
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