论文部分内容阅读
目的:建立气相色谱测定大白菜中5种常见拟除虫菊酯农药残留简单、快速、安全的实用型方法。方法:采用乙酸乙酯-QuEChERS法进行样品前处理,结合气相色谱-电子捕获检测器(GC/ECD)对大白菜中5种常见拟除虫菊酯农药残留进行检测分析。结果:在选定色谱条件下,5种拟除虫菊酯农药在40 min内得到有效的分离,方法对各目标物呈现良好的线性关系(r>0.999),最低检出浓度0.0037~0.012 mg/kg,平均加标回收率为80.17%~86.72%,相对标准偏差为1.70%~14.31%。结论:该法具有较高的精密度和灵敏度,且操作简单、分析速度快,可作为一种经济实用的分析方法应用于大白菜中拟除虫菊酯农药残留的常规检测。
Objective: To establish a simple, rapid and safe method for the determination of five common pyrethroid pesticide residues in Chinese cabbage by gas chromatography. Methods: Five kinds of common pyrethroid pesticide residues in Chinese cabbage were detected by GC-ECD with ethyl acetate-QuEChERS method. Results: Under the selected chromatographic conditions, the five pyrethroid pesticides were effectively separated within 40 min. The method showed a good linear relationship (r> 0.999) with the lowest detectable concentration of 0.0037 ~ 0.012 mg / kg , The average recovery was 80.17% ~ 86.72%, the relative standard deviation was 1.70% ~ 14.31%. Conclusion: The method has high precision and sensitivity, and simple operation, fast analysis, can be used as an economical and practical analytical method for routine detection of pyrethroid pesticide residues in Chinese cabbage.