The rapid increase in their application and the recent commercial introduction of some new pyrithroids require a method by which the residue of many pyrethroids can be determined. With the extensive utilization of OPPs and pyrethroide pesticides in agricultural practice, amount of these pesticides and their metabolites remain in soil, their intake by plant usually cause food pollution, or entry into water system even cause ecological and environmental question, especially in recent years, increasing public concern about possible health risks from pesticide resides has had emphasis on food quality and safety, therefore, special care must also be taken to the analysis of CHCs and OPPs, pyrethroids in environmental samples. The analytical methods for each kind of pesticides including CHCs, OPPs, pyrethroides have been stated in many documents, but little attention has been paid to their simultaneous determination, a modern trend in multiresidue analytical methodology is moving to the development of reliable procedures capable of determining as many pesticides as possible in the most rapid and accurate manner. Silicagel permeation chromatography is a widely used efficient technique for separation, purification and large molecule removal from sample extracts(Helreich,1990). In analytical procedure for multiresidue, acetone and dichloromethane have shown high effectiveness (Holland,1992). The main goal of this paper is to separate CHCs and OPPs, pyrethroid pesticides into two groups from their mixture through silicagel permeation chromatography eluted with 10% DCM inn-hexane and acetone, and develop a complete analytical methodology for simultaneous analysis of themwith GC-MS in selected-ion monitoring(SIM) mode.
我希望能翻译的通顺些！！！
|
