ICP-AES法测定丹参中的镉和铅

建立了利用电感耦合等离子体原子发射光谱(ICP-AES)法测定丹参中重金属元素Cd和Pb的方法,比较了干灰化法和湿化法两种样品处理方法对分析结果的影响,并测定了山东一些地区丹参中的Cd和Pb含量.结果表明:采用电感耦合等离子体原子发射光谱法检测丹参中的Cd和Pb,最低检出限(DL)分别为1.92和1.07 ng·mL-1;相对标准偏差(RSD)分别为3.14%和1.83%;回收率分别为103.05%和96.24%.利用湿法消解样品,精密度好,回收率高,优于干灰化法.干灰化法适合测定丹参中Pb,但不适合测定Cd,其回收率仅为0.1%.用湿法消解样品,测定不同产地丹参的Cd和Pb含量,结果表明:所测地区丹参的Cd,Pb含量大大低于《中华人民共和国药典》(2005)规定的中药材重金属含量标准,符合GAP生产的要求.

Study on the Determination of Cd and Pb in Radix Salviae Miltiorrhizae by ICP-AES

In the present paper, a method was developed for the determination of Cd and Pb by ICP-AES. The effects of two different sample treatment methods, including wet digestion method and dry ash method, were compared. The contents of Cd and Pb in Danshen (Radix Salviae miltiorrhizae) grown in some areas of Shandong were determined. The results show that it is satisfactory to apply ICP-AES to the determination of Cd and Pb with the detection limits (DL) of 1.92 ng x mL(-1) and 1.07 ng x mL(-1), the precision values (RSD) of 3.14% and 1.83%, and the recovery rates of 103.0% and 96.2% respectively. The wet digestion method is better than the dry ash method for its lower RSD and higher recovery rate. The dry ash method is suitable for the determination of Pb, but not suitable for the determination of Cd due to its low recovery rate. The results also show that the contents of Cd and Pb in Danshen are lower than the standard of Chinese Pharmacopoeia (2005), which meets the standard of GAP production.