Determination of 4 pyrethroid pesticide residues in greasy wool based on gas chromatography

In order to study and establish the national standard method of 4 kinds of pyrethroid pesticide residues in greasy wool by a gas chromatography-ECD method,the greasy wool were added with 4 levels mixed standard reagents(0.06,0.30,2.00,5.00 μg/g),which contains 4 kinds of pyrethroids,then the sample was extracted by n-hexane and aether(Volume ratio 2∶1),and then purified by a neutral alumina column and an florisil column and eluted by 4 mL of n-hexane and ethyl acetate(volume ratio 95∶5),and finally detected by gas chromatography-ECD,operation the quantitative results were obtained based on external standard method.The result shows that the limits of detection of 4 kinds of pesticides were 0.020,0.060,0.024,0.030 μg/g,respectively,the recoveries range were from 79.4% to 101.2%,and the relative standard deviations were between 1.20% and 3.08%.So the method has favorable separation effect,less disturbance peak,accurate result,easy and quick operation,less use of solvent and environmental friendliness.