Detection of epoxiconazole residue in the rice by ultrasound-assisted liquid chromatography
This study aims to rapidly detect the epoxiconazole residue in the rice by using ultrasound-assisted liquid chroma-tography.In the test,we optimized the sample pretreatment conditions first and then tested on methodological repeatability and standard addition recovery rate.The results indicate the epoxiconazole residue in the rice is best extracted when extractant is ac-etone,solid-to-liquid ratio(or sample to acetone ratio)is 1∶9,sodium chloride dosage is 3 g,and ultrasound extraction lasts 8 min.In 0.01-1.2 pg/mL concentration range,the linear correlation coefficient of epoxiconazole mass concentration and chrom-atographic peak area R2 is 0.99,the minimum limit of detection is 0.01 mg/mL,the relative standard deviation(RSD)of repeat tests is 1.77％,and the standard addition recovery rate range is 89.0％-90.1％.It is made clear through the trial that the ul-trasound and chromatography could speed up detection of epoxiconazole residue in the rice,improve extraction effect,save the test time,and accomplish an effective determination of epoxiconazole in the rice.
万方数据
维普
