摘要
针对茶叶中拟除虫菊酯类农药残留的提取方法进行研究，比较了加水浸泡对农残提取的影响。结果表明，加水浸泡的样品农残提取率反而降低，通过对样品净化淋洗剂种类和体积的优化选择，总结出一套简便实用的前处理方法。茶叶不用水浸泡，直接用50mL V（丙酮）：V（正己烷）=1：1的溶液超声提取，提取液过活性炭柱，浓缩后再过Florisil柱，用15mL V（正己烷）：V（乙酸乙酯）=2：1的溶液淋洗，浓缩后用GC／MS法测定。回收率为81％～120％，RSD为2．2％～7．8% A，检测限为0．002-0．01mg·kg^-1。
The factors of extracting pyrethroid pesticide multi-residues from tea were studied, especially for the influence of adding water into samples before organic solvents extraction. Results show that higher extracting efficiency is acquired without adding water. A simple and accurate pretreatment for pyrethroids in tea is reached by optimizing the choices and volumes of eluting solvents. The samples without water immersing were extracted by 50 mL of V-（hexane） ： V-（acetone） = 1 ： 1, followed by cleaning up with columns of activated carbon and Florisil respectively. 15 mL of V（hexane） ： V（ethyl acetate） =2 ： 1 was employed to elute the Florisil column, then was determined by GC/MS. The recoveries range from 81% to 120%, RSDs are 2.2%-7.8%, and the limits of detection are 0. 002- 0.01 mg. kg^-1.
出处
《质谱学报》
EI
CAS
CSCD
2008年第2期97-100,共4页
Journal of Chinese Mass Spectrometry Society
