关键词: 代森锌, 顶空溶剂吸收, 气相色谱, 莴笋, 残留

Abstract: The reaction was carried out using a headspace-absorption GC-ECD,HCl·SnCl₂ as the reaction reagent,n-hexane as the sorption solvent,determine the residue of zineb indicated by CS₂,establish a method for the detection of zineb in asparagus lettuce. Analysis the residues in different parts of lettuceand to determine its residual distribution and its digestion. This method is simple,fast and has good linearity,the detectable limit is 0.10 mg/kg,the average conversion rate of zineb was 90.4%~98.0%,the average recovery was 82.8%~103.6%,relative standard deviation was 2.4%~6.3%. The residue of zineb in asparagus lettuce showed that leaves>stems>peeled stems,14 days after spraying,zineb digestion rate reached more than 85%.

Key words: Zineb, Headspace-solvent absorption, gas chromatography, asparagus lettuce, residue