固相萃取-气相色谱法测定水中多种拟除虫菊酯类农药残留  

Determination of pyrethroid pesticide residues in water by gas chromatography method with solid-phase extraction

作　　者：张卫锋[1] 洪振涛[1] 蓝梦哲 李嘉静[1] 

机构地区：[1]广州市农业标准与监测中心,广东广州510308

出　　处：《广东农业科学》2009年第9期203-205,共3页Guangdong Agricultural Sciences

摘　　要：建立了固相萃取-气相色谱法测定水中8种拟除虫菊酯类农药残留量的方法:水样采用正己烷提取、氯化钠盐析、弗罗里硅土固相萃取柱净化,经丙酮∶正己烷(1∶9)溶剂洗脱,洗脱液吹氮浓缩,采用气相色谱外标法定量分析。测定结果显示:8种拟除虫菊酯类农药在仪器上的检测限为1.0～4.0μg/L,线性范围内相关系数为0.99951～1.00000,方法检测限为0.02～0.08μg/L;在0.20～20.00μg/L加标情况下的8种拟除虫菊酯类农药的回收率为92.6%～108.0%,方法精密度为1.3%～5.6%。该检测方法具有快速、简便、准确、灵敏、重现性好的特点,适合于水中拟除虫菊酯类农药的测定。A gas chromatographic （GC） method with solid-phase extraction （SPE） was developed for simultaneously determining residues of 8 kinds of pyrethroid pesticides in water. The sample was extracted with n-hexane and salted out with sodium chloride, separated with liquid-liquid partition and cleaned up with Florisil solid-phase extraction cartridges using acetone ： n-hexane （1：9, v/v） as eluent. The eluent was blown to dryness under a stream of nitrogen, was then injected into the GC system to quantitative analysis. Under the optimal conditions, pyrethroid pesticides showed good linear response below 1.0- 4.0 μg/L with r values in the range of 0.99951-1.00000, the limits of detection were 0.02-0.08μg/L, the recoveries for adding level in the ranges of 0.20-20.00 μg/L were 92.6%-108.0%, the relative standard deviations were 1.3%-5.6%. It was concluded that this method was rapid, accurate, sensitive and reproducible for determining trace pesticides in some water samples.

关 键 词：气相色谱法 固相萃取 拟除虫菊酯类农药 残留量 

分 类 号：S482.35[农业科学—农药学]