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目的建立利用电感耦合等离子体原子发射光谱(ICP-AES)法测定大花红景天中重金属元素Cd和Pb的方法。方法比较干灰化法和湿化法两种样品处理方法对分析结果的影响,并测定云南一些地区大花红景天中的Cd和Pb含量。结果采用电感耦合等离子体原子发射光谱法检测大花红景天中的Cd和Pb,最低检出限(DL)分别为1.43和1.16ng.ml-1;相对标准偏差(RSD)分别为2.35%和1.93%;回收率分别为102.84%和97.78%。利用湿法消解样品,精密度好,回收率高,优于干灰化法。干灰化法适合测定大花红景天中Pb,但不适合测定Cd,其回收率仅为0.2%。用湿法消解样品,测定不同产地大花红景天的Cd和Pb含量。结论所测地区大花红景天的Cd,Pb含量大大低于《中国药典》(2005)规定的中药材重金属含量标准,符合GAP生产的要求。
Objective To establish a method for the determination of heavy metal elements Cd and Pb in Rhodiola sachalinensis by inductively coupled plasma atomic emission spectrometry (ICP-AES). Methods The effects of two methods of dry ashing and wetting methods on the analytical results were compared. The contents of Cd and Pb in Rhodiola sachalinensis were also determined. Results The detection limit of Cd and Pb in Rhodiola rosea was 1.34 and 1.16ng.ml-1 by using inductively coupled plasma atomic emission spectrometry. The relative standard deviations (RSDs) were 2.35% and 1.93% respectively; the recoveries were 102.84% and 97.78% respectively. Using wet digestion samples, good precision, high recovery, better than the dry ashing method. Dry ashing method is suitable for the determination of Pb in Rhodiola, but not suitable for the determination of Cd, the recovery rate is only 0.2%. Samples were digested with wet method and the content of Cd and Pb in Rhodiola rosea from different areas were determined. Conclusion The contents of Cd and Pb in Rhodiola sachalinensis were significantly lower than the standards of heavy metals in Chinese medicinal materials stipulated in Chinese Pharmacopoeia (2005), which met the requirements of GAP production.