分光光度法测定镍基物料中铝分析方法的研究

Determination of aluminum in nickel based materials by Spectrophotometry

本文采用氢氧化镧为载体,在PH=10的氨性缓冲溶液中共沉淀富集分离铝,通过加入含有长碳链的有机表面活性剂CTMAB和OP,使其形成三元络合物,最大吸收波长红移为610nm,摩尔吸光系数为1.90×10^(5),灵敏度增大了约5倍。结果表明,在微酸性介质中,在CTMAB、OP和抗坏血酸存在下,铝与铬天青S生成络合物,样品的RSD在2.88%~5.59%,加标回收率为95.0%~105.2%,测定结果令人满意。

in this paper,lanthanum hydroxide is used as the carrier to coprecipitate,enrich and separate aluminum in pH=10 ammonia buffer solution.By adding organic surfactants CTMAB and op containing long carbon chain,it forms a ternary complex.The maximum absorption wavelength is red shifted to 610nm and the molar absorption coefficient is 1.90×10^(5),the sensitivity is increased by about 5 times.The results show that in slightly acidic medium,in the presence of CTMAB,OP and ascorbic acid,aluminum forms complex with chrome azurol s.The RSD of the sample is 2.88%~5.59%,and the recovery is 95.0%~105.2%.