同时萃取-原子吸收法测定锂盐中钙和镁

Simultaneous Extraction-Atomic Absorption Spectrometry Determination of Calcium and Magnesium in Lithium Salts

利用1-苯基-3-甲基-4-苯甲醯基吡唑啉酮-5(简称 PMBP)/甲基异丁基甲酮(MIBK)在六次甲基四胺存在下调节 pH=7.2使钙和镁同时萃取,继用0.2mol/L HCl-0.5mgNa/ml-lmgLa/ml 反萃取,原子吸收法测钙、镁。

Trace amount of Ca,Mg in Li_2CO_3,RbCl and CsCl was determined by flame atomic absorption spectrometry after the extraction of trace Ca and Mg in PMBP/ MIBK system at pH7.2 and back-extraction with a solution of 0.2 mol/LHCl-0.5mg Na/ ml^(-1)mg La/ml.It's an important condition to wash salts extracted with buffer solution. The present method is sensitive and simple.The standard recovery of Ca and Mg was 95% respectively,and the relative standard deviation was 2.3%.