摘要
本文研究了在pH9.5左右,利用La(Ⅲ)共沉淀富集分离锂盐中痕量铅。采用简易HG—3型氢化物发生器,同时吸入含铁氰化钾的试液和硼氢化钾溶液,生成氢化物,导入空气乙炔火焰,用原子吸收法测定铅。因预先采用共沉淀法分离除去了绝大部分干扰离子,提高了方法的选择性和精密度。当铅含量在1ppm时,平行11次测定的相对标准偏差为4%,回收率均在96%以上,特征浓度达0.009μg/mL1%吸收。
A method for the determination of trace amount of lead in lithium and its salts was described。The lead is separated from the matrix by lanthanum hydroxide coprecipitation and determined by hydride generation AAS。The sample and KBH_4 solution were taken up automatically in the analytical process。The sensitivity of the method is 0.009μg/mL for 1% absorption。The relative standard deviation is 4%。The conditions for separation and determination have been studied in detail。
出处
《分析试验室》
CAS
CSCD
北大核心
1991年第2期33-34,58,共3页
Chinese Journal of Analysis Laboratory
关键词
原子吸收法
锂盐
铅
氢氧化镧
lithium and its salts
Lead determination
Hydride generation AAS
Lanthanum hgdroxide copreciptation.
