火焰原子吸收法测定岩石中痕量钡

Determination of Trace Barium in Rocks by Flame AAS

摘要: 本文在pH为6.0的HAc-NaAc缓冲溶液中,以Pb为共沉淀剂用K_2CrO_4使Ba成BaCrO_4沉淀进行富集,再应用N_2O-C_2H_2火焰原子吸收光谱法测定Ba。方法的特征浓度为0.18μg/ml/1％吸收,标准加入回收率为96—102％。对于含Ba 3.86PPm的岩石样品进行10次测定,其相对标准偏差为0.96％。测定了GSD水系沉积物标样中的Ba,结果与推荐值吻合。

Abstract: Barium is preconcentrated and separated by coprecipitation with lead as chromate in sodium acetate buffer(pH 6)and determined by AAS in a nitrous oxide-acetylene flame. The interference of aluminum can be eliminated by adding salicylic acid as spectrochem