Study on the Condition for the Extraction of the Pesticide with the Residues of Cypermethrin from Water

[Objective]The condition affecting the extraction of the pesticide with residues of cypermethrin from water was studied.[Method] The best extraction conditions were obtained and the best dynamic mathematical model of the extraction rate and time was established through the optimization of the extractants,pH value and temperature impacting extraction result.[Results] The results showed that the mixture of petroleum ether and ethyl acetate could effectively be in the extraction of the cypermethrin,under which best ratio of volume was 90∶10;pH value,8 and temperature,25 ℃;the extraction rate was over 90%.At the same time,the dynamic model equations of the extraction rate and extraction time:(C0-Ct)/C0×100%=95.5-136.4/t was set up.[Conclusion] The model could express better the extraction rate trends with the extension of extraction time.