摘要
提出了气相色谱法、氮磷检测器测定葱中百菌清和三唑酮的残留量。葱样经磷酸酸化的乙腈提取,提取液通过弗罗里硅土柱浓缩净化后,用石油醚-丙酮(1+1)混合溶液洗脱,洗脱液经氮气吹干,正己烷定容至5.0 mL供气相色谱测定,外标法定量。百菌清和三唑酮的质量浓度在0.05～5.0,0.1～5.0 mg·L^(-1)范围内与其峰面积呈线性关系,检出限(3S/N)均为0.02 mg·kg^(-1)。百菌清和三唑酮的回收率分别在84.5%～90.2%和92.1%～101.0%之间,相对标准偏差(n=6)均小于5.5%。
Residual amounts of chlorthalomil and triadimefon in onion sample were determined by GC with nitrogen-phosphorus detector （NPD）. The insecticides insample were extracted with H3PO4 acidified acetonitrile and the extract obtained was purified and concentrated on Florisil column with petroleum ether-acetone （1＋1） as eluant. The eluate from column was evaporaed to dryness by N2-blowing and the residue taken up with 5. 0 mL of n- hexane, which was used for GC analysis. External standard calibration was adopted in the determination. Linear relationship between values of peak area and mass concentration of chlorthalomil and triadimefon were obtained in ranges of 0. 05 -- 5. 0 and 0. 1-- 5. 0 mg·L^-1 respectively, with detection limits of 0. 02 mg·kg^-1. Test for recovery was made by standard addition method, giving results in the ranges of 84. 5%--90. 2% （chlorthalomil） and 92. 1%--101.0% （triadimefon）. Values of RSDrs （n=6） found were less than 5. 5%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2009年第8期919-921,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
