毛细管气相色谱法测定杭白菊中乐果的残留量

DETERMINATION OF RESIDUAL DIMETHOATE IN HANGZHOU WHITE CHRYSANTHEMUM BY CAPILLARY GAS CHROMATOGRAPHY

采用乙腈作为提取剂 ,选用DB - 170 1型毛细管色谱柱 (30m× 0 .32mmi.d .,0 .2 5 μm)和火焰光度检测器 ,以毛细管气相色谱法测定杭白菊中乐果的残留量。线性范围为 0～ 12 .0 μg/mL ,线性回归方程为A =4 4 7.0c - 13.4 4 ,相关系数r =0 .999 88,检出限为 2 .6 8× 10 -2 μg/mL ,测定结果的相对标准偏差为 1.3%～ 3.1% ,回收率为 96 .3%～ 10 3.9%。

Acetonitrile was used as extractant, DB-1701 capillary column (30 m×0.32 mm i.d., 0.25 μm) and flame photometric detector were selected, the residual dimethoate in Hangzhou white chrysanthemum was determined by capllary gas chromatography. In the range of 0～12.0 μg/mL, the linear regression equation is A= 447.0c-13.44 with the correlation coefficient of 0.99988. The detection limit is 2.68×10 -2 μg/mL, the relative standard deviation is 1.3%～3.1% and the recovery is 96.3%～ 103.9%.