有机氯农药残留检测的快速样品前处理效果研究

应用快速样品前处理技术（QuEChERS）与《NY/ T 761-2008 蔬菜和水果中有机磷、有机氯、拟除虫菊酯和氨基甲酸酯类农药多残留的测定法》（NY/ T 761-2008）的前处理方法处理农产品样本,采用气相色谱检测多种农产品中有机氯农药残留量. 分析了 QuEChERS 法前处理用于有机氯农残检测的效果. 结果表明：QuEChERS 法前处理测定18 种有机氯农药残留加标回收率在72. 1% ~ 123. 9%之间,RSD 在0. 5% ~ 19. 1%之间,有72. 2%的农药检出限大于等于 NY/ T 761-2008 方法,只有27. 8%略低于 NY/ T 761-2008 方法,对多种蔬菜水果的测试均符合多农残检测方法要求,结果准确可靠. QuEChERS 法前处理消耗的有机溶剂少、处理速度快、选择性强、回收率高、精密度高、实用性强、安全性更高. 检测有机氯农残时,可在-般情况下替代 NY/ T 761-2008 的前处理方法.

Effect of QuEChERS Pretreatment on Organochlorine Pesticide Residue Detection

The pretreatment methods described by quick, easy, cheap, effective, rugged, and safe (QuEChERS) and NY/T 761-2008 were used to treat several tested agricultural samples, then the residue of organochlorine pesticide content of the tested samples was determined by gas chromatography, and the detection results were compared. The results showed that, the average spiked recoveries of the 18 residues of organochlorine pesticides of tested vegetable samples ranged from 72.1%~123.9%, with the relative standard deviations of 0.5%~19.1%. 72.2% of the pesticides detection limits (LODs) were above or equal to NY/T 761-2008 method, only 27.8% were below the NY/T 761-2008 method. The analysis results of several vegetable materials confirmed that the pretreatment by QuEChERS can meet the requirement of determination methods for multi-pesticide residue analysis by GC, and accurate and reliable results were obtained. Due to the low consumption of organic solvent, fast processing rate, strong selectivity, high recovery, high precision and strong practicality, when the pretreatment of QuEChERS could replace of NY/T 761-2008 in the detection of organochlorine pesticide residues in general cases.