铌-酒石酸-铬天青S-溴化十六烷基吡啶分光光度法测定微量铌  

Determination of Micro Niobium by Nb(Ⅴ)-Tartaric acid-Chrome Azurol S-Cetylpyridinium Bromide Spectrophotometry

作　　者：王影[1] 李艳杰 沈亮亮[1] 覃事栋[1] 

机构地区：[1]吉首大学化学化工学院 [2]湘西州质量技术监督局食品检验室,湖南省吉首市环城路48号416000

出　　处：《光谱实验室》2013年第1期220-223,共4页Chinese Journal of Spectroscopy Laboratory

摘　　要：研究了以酒石酸作为络合剂,铌与铬天青S及溴化十六烷基吡啶的显色反应及应用。吸光实验表明,在盐酸溶液中,Nb(V)-CAS-CPB形成稳定的络合物,最大吸收波长为504nm,表观摩尔系数为2.1×10~6L·mol^(-1)·cm^(-1)。铌浓度在0—2.4μg/25mL范围内遵守比耳定律,相关系数为0.9989。该法测定铌钽矿中铌,测得铌的含量为0.502%。With tartaric acid as complexing agent,the color reaction of Nb（Ⅴ） with chrome azurol S（CAS） and cetylpyridinium bromide（CPB） and its application were discussed.The experiment showed that a stable complex Nb（Ⅴ）-CAS-CPB was formed in hydrochloric acid,the maximum absorption wavelength was 504nm,and molar absorptivity was 2.1×10~6L ？ mol^（-1） ？ cm^（-1）.Beer＇s law was obeyed in the range of 0—2.4μg/25mL for niobium concentration with the correlation coefficient of 0.9989.The method was applied to determination of niobium in niobium-tantalum ore,and content of niobium was 0.502%.

关 键 词：铬天青S 溴化十六烷基吡啶 铌 分光光度法 

分 类 号：O657.32[理学—分析化学]