固体悬浮进样-石墨炉原子吸收法测定黄芪中铅  

Determination of lead in radix astragali by solid suspension sampling-graphite furnace atomic absorption spectrometry

作　　者：朱晓敏[1] 刘月英 刘卫洁[1] 胡凤喜 

机构地区：[1]邯郸学院,河北邯郸056005 [2]邯郸市永年区第一实验学校,河北邯郸057150

出　　处：《煤炭与化工》2017年第2期60-63,共4页Coal and Chemical Industry

摘　　要：采用固体悬浮液进样与石墨炉原子吸收法联用直接测定中药黄芪中的铅含量。在实验中,通过对悬浮剂、铅标液及黄芪灰化规律的研究,以不损失铅,提高灰化温度,降低背景吸收为前提,得到选择基体改进剂方法。最佳实验条件为:0.5%硝酸镁和0.2%磷酸二氢铵均可作为黄芪悬浮液的基体改进剂,灰化温度为750℃。在最佳条件下,测得黄芪中铅含量为5.33 mg/kg,方法的检出限为0.26 ng/m L,回收率为96.0%~99.0%。本方法为固体悬浮进样-石墨炉原子吸收法中选择基体改进剂提供了方法依据。Lead content in radix astragali was directiy determined by using solid suspension sampling and graphite furnace atomic absorption spectrometry （GFAAS）. During the experiment, through the research on the suspension, lead standard solution and ashing rules of radix astragali, the method of matrix modifier was chose with no loss of lead, increasing ashing temperature and reducing the background absorption as the premise. The optimum experimental conditions are 0.5% Mg- （NO3）2 and 0.2% NH4H2PO4 can be used as the matrix modifier of radix astragali suspension, ashing temperature is 750 %. Under the optimum conditions, the content of lead in radix astragali is 5.33 mg/kg, the detection limit is 0.26 ng/mL, and the recovery is from 96% -99%.The method provides a basis for the selection of matrix modifier using the solid suspension sampling-- GFAAS.

关 键 词：悬浮进样技术 石墨炉原子吸收光谱法 基体改进剂 黄芪 铅 

分 类 号：R284.1[医药卫生—中药学]