Determination of Pesticide Residues of Dimethoate and Fenitrothion in Chestnut by Gas Chromatography
A method for the simultaneous determination of two common organophosphorus pesticides residues in chestnut by gas chromatography was established.The samples were extracted,filtered and concentrated by ethene,then fixed with acetone and injected into the gas chromatograph.The pesticide components were separated on a DB-17 capillary column,detected by a flame photometric detector,characterized by retention time and quantified by external standard method.The results showed that in the concentration range of 10～500 μg·L-1,the peak areas of dimethoate and fenitrothion showed good linear correlation with the concentration,and the correlation coefficients were more than 0.999.The limits of detection were 0.006 mg·kg-1,and the limits of quantification were 0.02 mg·kg-1.The recoveries of the spiked pesticides were in the range of 84.01%～100.59%,and the relative standard deviations were≤5.05%.The method is accurate,the pretreatment process is simple and fast,and is suitable for the detection and analysis of pesticide residues of dimethoate and fenitrothion in chestnut.
NETL
NSTL
万方数据
维普
