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Microporous PTFE Capillary On-Line Concentration Coupled To Flow Injection Analysis For Determination Of Propoxur

Gu Jin, Qizhi Yao, Lei Zhang

Capillary on-line linear concentration coupled with flow injection manifold was applied to determination of propoxur. The method is based on the alkaline hydrolysis of the pesticide and the resultant phenol is reacted with 4-aminoantipyrine in the presence of an oxidizing agent. The results showed that this method is simple and practicable, and is one of the most sensitive methods for the determination of propoxur. The linear range after concentration was between 0.2 μg⋅l-1 and 20 μg⋅l-1 for propoxur. The linear regression equation can be expressed by A=0.032c (μg⋅l-1) +0.0019(r=0.9996, n=9). The detection limit(three times the signal blank/slope) was 0.04 μg⋅l-1. The choice of concentration capillary and design for on-line concentration was studied carefully. The experimental conditions and reliability of the method was described exhaustively. The method is used to determine propoxur in spiked water samples. The recovery is between 92 % to 102 %.