Improving the Recoveries of Certain Pesticides

However, it was decided to keep the method simple and not to introduce any pH-adjustment in the extraction/partitioning step, since the base-sensitive pesticides tested gave acceptable recoveries when extrachon and injechon were performed fast, and since the recoveries of the basic peshcides were shown to be completely unaffected by pH. As to the protechon of base-sensitive peshcides following PSA cleanup, the addition of acehc acid to the hnal extracts was suggested in the original procedure. 

Pesticides with acidic groups (e.g., phenoxyalcanoic acids) interact with amino-sorbents such as PSA. Thus, if such pesticides are within the scope of analysis, their determinative analysis should be performed directly from the 

The recoveries of the acid-labile pesticides ethoxy quin and pymetrozine can be raised if 1.5 g of trisodium citrate is used, instead of using 1 g of the di- and 

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