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Practical comparison of three principles for the extraction of residual pyrethroids fromaqueousmatrices:Relativemerits and demerits

Saeed S.Albaseer

The choice of a sample preparation method is not an easy task, as many aspects should be accounted for. These aspects are either related to the analyte(s) of interest or the method and its compatibility with the sample matrix. Severalmethods, however, can be applied for the extraction of pyrethroids from aqueous samples but none is free of drawbacks. In this paper, three recently developed principles for the extraction of synthetic pyrethroids from aqueous samples have been practically and statistically evaluated. Merits and demerits have been discussed. It has been found that the method extraction capability is not the solely characteristic that should be looked at when choosing an extraction method. Other characteristics such as method detection limits, sample preparation time, and stability of the analytes in the extracting phase are also important. Pyrethroids are very hydrophobic and adsorb strongly onto walls of devices used for extraction and, hence, the kind of extraction vessel material is important.