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《Journal of Hygiene Research》 2002-04
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Determination of heavy metal in Chinese herbs

Li Xiaowei, Gao Junquan, Zhao Jingling Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, Beijing 100050, China  
Microwave digestion system was used in digesting samples. Lead and cadmium were determined by graphite furnace atomic absorption spectrometry. Mercury was determined by cold vapor atomic absorption spectrometry. Standard reference material (NBS1570), spinach powder was used as analysis quality assurance in this method, and 264 Chinese herbs (23 species) and standard reference material were determined, and satisfactory results were obtained by using this method. Averages recovery of lead, cadmium and mercury is 95.0%, 97.5% and 99.2% respectively. Limit of detection (LOD) is 0.006mg/kg, 0.208 μg/kg and 0.026μg /kg respectively for lead, cadmium and mercury. Limit of quantity (LOQ) is 0.019mg/kg, 0.694 μg/kg and 0.087μg/kg respectively for lead, cadmium and mercury. This method is also suitable to determine lead, cadmium and mercury in food.
【Fund】: 国家中医药管理局“九五”科技攻关项目 (No .96 90 3 0 2 0 1 )
【CateGory Index】: TQ460.7
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