代森环在大白菜中残留动态研究

Study on the Residues of Milned in Chinese Cab-bage

本文对代森环在大白菜中残留规律进行了研究。建立了乙撑硫脲在大白菜上的残留分析方法。试验结果表明，大白菜中代森环残留量与喷药次数呈正相关，喷药当天的残留量最高达４６．５０ｐｐｍ，代森环在大白莱中的半衰期为６～７天，所有样品中均未检出乙撑硫脲残留。研究确定代森环在大白莱上的安全间隔期为３４天。

The residues of milneb in chinese cabbage werestudied The residue analytical method of ethylenethiourea(ETU)in chinese cabbage was established.ETU were con-versed to the s-benzyl derivative and measured by gas-liquidchromatography.The results showed that the residue of mil-neb in chinese cabbage was related to the application time ofmilneb,and the maxium residue of milneb in chinese cabbageon application day was 46.50mg/kg. The half life of milneb inchinese cabbage was 6～7days. The residue of ETU was notdetectable in all samples. The results also indicated that thesafe waiting time of milneb on chinese cabbage was 34 days.