A.A Babaei - Chemistry Department, Payame Noor University-Sari(PNU), Mazandaran, Iran
M. Mirzaei - Saina Hygienic Indust.Co-Abhar, Zanjan, Iran
R. Heidari - Chemistry Department, Payame Noor University-Abhar (PNU), Zanjan, Iran

hrin is a common synthetic chemical [1], widely used as an insecticide, acaricide, and nt. It belongs to the family of synthetic chemicals called pyrethroids and functions oxin, affecting neuron membranes by prolonging sodium channel activation. It is not dly harm most mammals or birds, but is highly toxic to fish and cats. It generally ha a lian toxicity and is poorly absorbed by skin. Permethrin has recently been li ng dogs as a flea/tick repellent. hrin content was determination by HPLC method [2] but we decide detrmine by GC method because this method is inexpensive and popular. This group pr he determination of Bioallethrin assay[3] and Cypermethrin assay [4] by GC method. hod permethrin is dissolved in 4-methylpentan-2-one containing n-octacosane as d. The permethrin, isolated as two isomer peaks, is determined by comparis ion solutions.