反萃取FAAS测定树脂固化促进剂中环烷酸钴

Determination of Cobalt in Solidified Resin Promoter by Successive Extraction and FAAS

提出了在 1mol·L-1NH4 SCN介质中用MIBK萃取 ,4mol·L-1HNO3 反萃取火焰原子吸收光谱 (FAAS)测定微量钴的新方法。试验表明 ,4mol·L-1HNO3 是钴的良好反萃取剂 ,钴浓度在 0～ 5mg·L-1范围内有良好的线性关系 ,检测限可达 0 0 70mg·L-1。测定树脂固化促进剂中微量钴 ,加标回收率在 96 2 %～ 10 4 6 %。

A new method had been investigated for the analysis of micro-amount of cobalt in solidified resin promoter. Methyl isobutyl ketone (MIBK) was used in 1 mol(.)L(-1) NH4SCN medium followed by 4 mol(.)L(-1) nitric acid back extraction step, then analysis by flame atomic absorption spectrometry. The results indicated that the method was accurate and the interference with concomitant in solidified resin promoter was negligible. The method had a recovery of 96.2%-104.6%.