蔬菜中克螨特残留量的气相色谱法测定

Determination of propargite residue in vegetables by gas chromatography

建立了蔬菜中克螨特残留量气相色谱测定方法．以石油醚／丙酮（1：1）或正己烷／丙酮（1：1）混合溶剂为提取剂．振荡萃取，通过液-液分配除去提取剂中的水溶性杂质和水分，并以弗罗里硅土层析柱去除提取液中的有机杂质．正己烷／乙酸乙酯（95：5）或正己烷／丙酮（95：5）洗脱剂洗脱克螨特．用GCFPD（配S滤光片）测定克螨特残留量，色谱柱采用“农残Ⅱ”毛细管柱。结果表明，蔬菜样品中的克螨特平均添加回收率为88．5％-108．1％．相对标准偏差（RSD）为3．14％～9．54％，最小检测量为0．1ng．检出限为0．01mg·kg^-1。该方法简便、准确、能满足实际样品分析。

A method for determining propargite residue in vegetables was established by gas chromatography. The vegetable samples were treated with petroleum ether/acetone （1 ： 1） or n-hexane/acetone （1 ： 1）. then extracted by agitation, the water-soluble impurities in the extract were removed by llquid-liquid partitioning method, the or ganic impurities were removed with florisil chromatography, then the detergent of n-hexane/ethyl acetate （95 ： 5） or n-hexane/acetone （95 ： 5） was used to elute proparglte. Propargite was determined by GC - FPD （with S optical lamella）, separated by “Pesticide Residuaes Ⅱ” capillary column. The results showed that the average recovery of propargite ranged from 88. 5 % ~ 108.1%, and RSD 0. 01 mg · kg^-1 in vegetable samples. This method is pies. ranged from 3.14%-9.54%, MDQ was 0. 1 ng, LOD was simple, accuratc, and it can satisfy the analysis of reality samples.