氢化物发生-原子吸收光谱法测定中草药中铅量  

HG-AAS Determination of Lead in Chinese Herbal Medicines

作　　者：刘红[1] 陈燕芹[1] 归国风[1] 

机构地区：[1]毕节学院化学系,毕节551700

出　　处：《理化检验（化学分册）》2012年第9期1021-1022,1026,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：贵州省固体废弃物综合利用科技创新人才团队项目合同号[黔科合人才团队(2010)4011号]

摘　　要：中草药样品经硝酸-过氧化氢消化处理后,在酸性条件下用铁氰化钾将铅(Ⅱ)氧化为铅(Ⅳ),然后再以硼氢化钾为还原剂,盐酸为载流,用流动注射-氢化物发生-原子吸收光谱法测定铅含量。铅的质量浓度在0.50～20μg.L-1范围内与其吸光度呈线性关系,检出限(3S/N)为0.067μg.L-1。用此方法分析了4种中草药样品,铅测定值的相对标准偏差(n=5)在3.2%～4.8%之间,加标回收率在95.6%～103%之间。Sample of Chinese herbal medicine was digested with HNO3-H2O2 and oxidized by K3 Fe（CN）6, to transform Pb（ Ⅱ ） into Pb（ Ⅳ ）. Lead was then determined by flow injection-hydride generation-atomic absorption spectroscopy （FI-HG-AAS） with KBH4 as reducing reagent and HCl as carrying solution. Linear relationship between values of absorbance and mass concentration of lead were obtained in the range of 0. 50--20 μg·L-1 , with detection limit （3S/N） of 0. 067 μg·L-1. Four samples of Chinese herbal medicines were analyzed by the proposed method, values of RSD＇s （n=5） obtained were in the range of 3. 20%--4. 8%, and values of recovery found by standard addition method were in the range of 95.6%-103%.

关 键 词：氢化物发生-原子吸收光谱法 铅 中草药 

分 类 号：O657.31[理学—分析化学]