十六烷基三甲基溴化铵增敏-甲亚胺H光度法测定微量硼  

Photometric Determination of Micro-amounts of Boron with Azomethine-H Sensitized by CTMAB

作　　者：伊文涛[1] 闫春燕[1] 马培华[1] 李法强[1] 韩井伟[1] 

机构地区：[1]中国科学院青海盐湖研究所

出　　处：《理化检验（化学分册）》2008年第8期770-772,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家“十五”科技攻关计划滚动支持项目(2004BA602B-01)

摘　　要：在微酸性介质（pH 5.2）、助表面活性剂正丁醇存在下，以阳离子表面活性剂十六烷基三甲基溴化铵（CTMAB）为增敏剂，甲亚胺-H光度法测定盐湖初级锂盐产品碳酸锂中微量硼。CTMAB的加入可使体系增敏31%，最大吸收波长在412 nm处，表观摩尔吸光率为3.62×10^4L·mol^-1·cm^-1，硼含量在1.6 mg·L^-1以内遵守比耳定律，线性回归方程A=0.043 57＋0.020 72C，相关系数为0.999 7。应用该法测定纯度为99.5%碳酸锂中微量硼，试验结果的相对标准偏差均小于2.0%，回收率在99.8%-101.5%之间。In an acetate buffer medium of pH 5.2, and in the presence of n-butanol and CTMAB, sensitivity of the color reaction between boron（ HI ） and azomethine H was raised about 31%. Absorption maximum of the colored complex was found at the wavelength of 412 nm, where the molar absorptivity was found to be 3.62×10^4L·mol^-1·cm^-1. Beer＇ s law was kept in the range within 1.6 mg·L^-1 , corresponding to the linear regression equation of A=0. 043 57＋0. 020 72 C （C concn, of B（ Ⅲ ） in mg· L^-1） with its correlation coefficient of 0. 999 7. The proposed method was used in the determination of microamounts of boron in lithium carbonate, giving values of RSD＇s （n=8） less than 2. 0%. Recovery test was performed by standard addition method, and values of recovery obtained were in the range of 99.8f%-101.5%.

关 键 词：光度法 硼 甲亚胺-H 增敏作用 CTMAB 

分 类 号：O657.31[理学—分析化学]