毛细管气相色谱法测定代用茶中八氯二丙醚残留量研究

Determination of residual octachlorodipropyl ether in substitutional tea by capillary gas-chromatography

建立了用毛细管柱气相色谱法快速测定代用茶中八氯二丙醚（S-421）残留量的方法。样品采用正己烷反复提取，定容后经浓硫酸磺化，离心净化。优化实验条件，选择HP-1ms石英毛细管柱进行分析，方法线性良好，加标量为0．1～0.6mg／kg时，回收率为96．1％～101.2％，RSD≤4％，最低检出限为0．004mg/kg。

A rapid method was developed for the determination of residual octachlorodipropyl ether in substitutional tea. The analytical procedure was based on the extraction from substitutional tea with n-hexane repeatedly and purification with oil of vitriol assisted by centrifugation. Residue levels were determined by capillary gas chromatography with electrical conductivity detector and HP-1 ms capillary. The ECD response for S-421 was linear in the concentration range studied. Average recoveries obtained for S-421 in the different substitutional teas were from 96.1% to 101.2% with relative standard deviations of ≤4% when the concentration of standard in substitutional teas were from 0.1 mg/kg to 0.6mg/kg. The low detection limits was 0.004mg/kg.