Determination of 2 Strobilurin Fungicide Residues in Soil by Modified QuEChERS Method Combined with Liquid Chromatography
The study aimed at establishing a high performance liquid chromatography(HPLC)method for the determination of pyraclostrobin and kresoxim-methyl in three different types of soil from Xinjiang,Inner Mongolia and Heilongjiang.The separation of pyraclostrobin or kresoxim-methyl in samples was performed by modified QuEChERS method combined with HPLC,and the quantitative results were calculated by external standard method.The results showed good linearity in the concentration ranged from 0.3-10.0 mg/L,and the correlation coefficient(R2)was greater than 0.9999.At different concentrations,the average recoveries of pyraclostrobin and kresoxim-methyl in Yermosols of Xinjiang were 98.03％-102.32％and 100.33％-107.18％with relative standard deviations(RSD)of 0.46％-0.87％and 0.94％-1.67％.The average recoveries of pyraclostrobin and kresoxim-methyl in Chernozem of Heilongjiang were 100.40％-104.32％and 90.83％-101.33％with RSD of 0.47％-2.78％and 1.35％-1.69％.The average recoveries of pyraclostrobin and kresoxim-methyl in Xerosols of Inner Mongolia were 100.04％-107.40％and 96.90％-98.86％with RSD of 0.77％-1.41％and 1.08％-1.57％.The accuracy and precision of the method meet the requirements of pesticide residue analysis,and it is suitable for the determination of pyraclostrobin and kresoxim-methyl in above types of soil.
万方数据
维普
