离子色谱法测定假冒卷烟所用熏硫烟叶中的亚硫酸盐

建立了离子交换-电导检测离子色谱法测定假冒卷烟所用熏硫烟叶中亚硫酸盐的检测方法。选用Ion-Pac AS11-HC型分离柱,以15 mmol/L KOH为淋洗液,样品经10 mmol/L KOH溶液浸提后,过滤进样分析。SO32-浓度在0.2~20.0 mg/L范围内与色谱峰面积呈良好的线性关系,线性相关系数r=0.999 6。该法测定结果的相对标准偏差为1.96%(n=6),样品加标回收率为92.50%~98.20%,检出限为0.051 mg/L。

MEASUREMENT OF SULFITE IN SULFURING TOBACCO LEAVES USED FOR COUNTERFEIT CIGARETTE BY ION CHROMATOGRAPHY

An ion exchange method with conducting detection was established to measure sulfite in sulfuring tobacco leaves used for producing counterfeit cigarettes. IonPac AS11 -HC was selected as the separation column, 15 mmol/L KOH was used as elu- ent. After being digested with 10 mmol/L KOH and filtrated with 0.45 ixm membrane, the samples were injected and analyzed. The linear range was 0.2 -20.0 mg/L with the correlation coefficient of 0. 9996. The RSD of detection results was 1.96% （n =6）. The spike recovery rate in sample was 92.50% -98.20% and the detection limit was 0. 051 mg/L.