气相色谱-质谱联用测定苹果中7种有机磷农药残留
2021-01-10王小琴王璐王庆国冯疆涛
王小琴 王璐 王庆国 冯疆涛


摘 要:目的:建立同时测定苹果中7种有机磷农药残留的GC-MS检测法。方法 样品采用QuEChERS前处理,正己烷溶液进行提取,经无水硫酸钠和PSA净化,浓缩定容后用GC-MS法在SCAN和SIM模式下进行测定,通过保留时间、特征离子及其相对丰度定性,外标法定量。结果:6种有机磷农药质量浓度范围在0.025~1.000 μg/mL,久效磷在0.25~10.00 μg/mL的线性关系良好,相关系数R2均≥0.997。结论:该方法具有经济、快速、灵敏度高、重现性好等优势,适用于食品中多种农药残留的同时快速测定。
关键词:苹果;QuEChERS;GC-MS;有机磷农药;外标法定量
Determination of Seven Organophosphorus Pesticide Residues in Apple by Gas Chromatography-mass Spectrometry
WANG Xiaoqin1, WANG Lu1, WANG Qingguo2*, FENG Jiangtao1
(1.Xinjiang Aksu Center for Disease Control and prevention, Aksu 843000, China; 2.Center for Disease Control and prevention of Xinjiang Uygur Autonomous Region, Urumqi 830000, China)
Abstract: Purpose A GC-MS method for the simultaneous determination of seven organophosphorus pesticide residues in apples was established.Method Samples were pretreated with QuEChERS,Extraction with n-hexane solution,Purified by anhydrous sodium sulfate and PSA,After concentration and constant volume, it was determined by GC-MS in scan and sim mode,Qualitative analysis by retention time, characteristic ions and their relative abundance,External standard method.Result The mass concentration of Six Organophosphorus Pesticides ranges from 0.025 to 1.000 μg/mL,The linear relationship of monocrotophos in the mass concentration range of 0.25~10.00 μg/mL is good,The correlation coefficients R2 were ≥0.997. Conclusion the method has the advantages of economy, rapidity, high sensitivity and good reproducibility. It is suitable for the simultaneous and rapid determination of multiple pesticide residues in food.
Keywords: apple; QuEChERS; GC-MS; organophosphorus pesticides; external standard quantitative method
有機磷农药是我国应用最多的磷酸酯类农药,当前,在农业生产中,有机磷农药的使用非常普遍、广泛,是有效清除蔬菜、水果病虫害危险的高效广谱杀虫剂。而有机磷农药的品种非常多,常见的有乐果、久效磷、对硫酸和马拉硫酸4种,这4种有机磷农药具有杀虫谱广、价格低廉、杀虫速度快的优点,也正是因为如此,有机磷农药的使用范围非常广泛。有机磷农药属于一种神经毒物,如果摄入过量,会导致人的神经功能紊乱,严重损害身体健康。因此,必须要开展更为高效的有机磷农药残留的检测方法,才能够准确掌握农药的残留情况并及时清除,对人们的生命安全做出全面保障。所以,开展蔬菜中有机磷农药残留监测工作,及时、准确地检测残留农药,对蔬菜安全生产及提高蔬菜品质具有重要意义。日常检测中,农残监测的任务繁重,当前我国农药残留监测的方法主要为GC、GC-MS等,随着气相色谱三重四级杆质谱的普及,GC-MS的检测方法以其高选择性、高灵敏度、高通量等特点,应用越来越广泛。……
