张建宇 黄义彬 张莉

摘要:建立了固相萃取-高效液相色谱法同时测定蔬菜中8种氨基甲酸酯农药(涕灭威亚砜、涕灭威砜、灭多威、三羟基克百威、涕灭威、克百威、甲萘威和抗蚜威)残留的方法。蔬菜样品采用乙腈提取,经氨基小柱净化,以(乙腈∶甲醇=8∶3,V/V)-水为流动相进行梯度洗脱,流速1.0 mL/min,柱温40 ℃,C18柱分离,检测波长220 nm。结果表明,8种农药在蔬菜中的加标回收率为75.3%~112.5%,相对偏差小于6%。该方法简便快速、准确度高,符合实际应用需要。
关键词:蔬菜;氨基甲酸酯;固相萃取;高效液相色谱
中图分类号:O657.7+2 文献标识码:A 文章编号:0439-8114(2015)14-3510-03
DOI:10.14088/j.cnki.issn0439-8114.2015.14.046
Detecting Eight Kinds of Carbamate Pesticides in Vegetables by SPE-HPLC
ZHANG Jian-yu, HUANG Yi-bin, ZHANG Li
(Agricultural product quality safety supervision and Testing Center of Guiyang,Guiyang, 550004, China)
Abstract: The 8 kinds of carbamate pesticides (including aldicarb sulfoxide, aldicarb sulfone, methomyl, 3-hydroxy carbofuran, aldicarb, carbofuran, carbaryl, pirimicarb) in vegetables by solid phase extraction-high performance liquid chromatography (SPE-HPLC) was investigated. The samples were extracted by acetonitrile and purified by amino solid phase extraction column, and separated gradiently with the mobile phase consisting of acetonitrile methanol mixer(8∶3,V/V) and water on the column of C18 at 40 ℃, the flow rate was 1.0 mL/min,and the wavelengh was detected at 220 nm. The results showed that the recovery rate of 8 kinds of pesticides in vegetable was 75.3%~112.5%,RSD was less than 6%. This method is simple, rapid, accurate for detecting carbamate pesticide residues in vegetables.
Key words: vegetables; carbamate; SPE; HPLC
氨基甲酸酯类农药是一类高效、广谱、低毒的杀虫剂,具有分解快、残留期短、选择性强等特点,使用广泛[1-4]。目前,氨基甲酸酯类农药的检测方法主要为柱后衍生荧光检测HPLC法[5-10],但该方法需要配套柱后衍生系统和使用衍生化试剂,检测成本居高不下。本研究运用固相萃取技术对样品的前处理过程进行优化,以HPLC紫外检测法建立一种蔬菜中氨基甲酸酯类农药残留的检测技术。
1 材料与方法
1.1 仪器与试剂
Waters e2695 高效液相色谱仪,TOMTEC全自动匀浆机、EVAP-112氮吹仪,上海安谱CNW氨基固相萃取小柱500 mg、色谱纯甲醇、乙腈和二氯甲烷(美国Tedia)。
1.2 方法
1.2.1 提取与净化 将25.0 g经粉碎均质后的蔬菜置于匀浆机中加入50 mL乙腈,匀浆2 min后过滤,收集滤液至100 mL具塞比色管中,加入6 g氯化钠振荡1 min后,室温静置30 min。吸取上层清液10.0 mL于小烧杯中,80 ℃氮吹至近干,用2.0 mL丙酮溶解,待净化。加样前将氨基柱用4.0 mL甲醇+二氯甲烷(1∶99,V/V)预洗活化,当溶剂液面到达柱吸附层表面时,立即加入提取液,用15 mL离心管收集洗脱液。……