Gas chromatographic mass spectrometric study of photodegradation of carbamate pesticides

被引:38
作者
Climent, MJ [1 ]
Miranda, MA [1 ]
机构
[1] UNIV POLITECN VALENCIA,INST TECNOL QUIM,DEPT QUIM,E-46071 VALENCIA,SPAIN
关键词
photodegradation; environmental analysis; carbamates; pesticides;
D O I
10.1016/0021-9673(96)00084-2
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
The photodegradation of seven carbamate pesticides (bendiocarb, isoprocarb, promecarb, ethiofencarb, furathiocarb, fenoxycarb and pirimicarb), in aqueous solution, has been examined by GC-MS. The most general result was formation of the corresponding phenols. Irradation of isoprocarb and promecarb also resulted in photo-Fries rearrangement to ortho- and para-hydroxybenzamides. In the case of ethiofencarb photocleavage of the carbon-sulfur bond gave 2-methylphenyl methylcarbamate as main product. Likewise, N-S bond cleavage occurred upon irradiation of furathiocarb, to allow the formation of the carbamate insecticide carbofuran, butyl methylcarbamate and carbofuranphenol. Under similar conditions, fenoxycarb gave p-phenylphenol and 2-hydroxydibenzofuran, through primary homolysis of the aryloxy-methylene bond. Finally, pirimicarb gave rise to 2-formylamino-5,6-dimethylpyrimidin-4-yl dimethylcarbamate.
引用
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页码:225 / 231
页数:7
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