摘要
在强酸性溶液中,Mo（Ⅵ）、Sn（Ⅳ）和Sb％（Ⅲ）均与水杨基荧光酮和阳离子表面活性剂溴化十六烷基三甲铵发生高灵敏的显色反应,生成稳定的三元胶束络合物。其λ(max)分别为523.0,507.0和510.0nm,表明吸收光谱严重重叠;在相应λ(max)处,其表观摩尔吸光系数分别为1.28×10~5（Mo）、1.50×10~5（Sn）和7.16×10~4（Sb）L·mol^(-1)·cm^(-1)。用偏最小二乘法（PLS）、迭代目标转换因于分析法（ITTFA）、模拟纯谱卡尔曼滤波法（KF-M）和CPA-P矩阵法辅助吸光光度法,不经分离,同时测定了模拟样和铸铁标样中的痕量或小量钼、锡和锑。由于体系的加和性良好,故均取得了满意的结果。但从结果的准确度和精密度看,PLS和ITTFA法明显地优于KF-M和CPA-P法。
It is reported in this paper that any of the Mo( VI ), Sn( IV ) and Sb( III ) ion can react with salicylphenyl-fluorone and CTMAB in a strong acid medium, to form a stable and highly sensitive ternary micellar complex. Their absorption maxima lie at 523, 0, 507. 0 and 510. 0nm respectively indicating a serious overlapping. Their apparent molar absorptivities are 1. 28 × 105, 1. 50×105 and 7. 16×104 L·mol-1·cm-1 respectively. Methods of chemometric calibration, e. g. the PLS, ITTFA, KF-M and CPA-P are applied to the simultaneous absorptiophotometric determination of traces of molybdenum, tin and antimony in the presence of each other without separation. The proposed method has been applied to the analysis of simulated samples and standard reference materials of cast iron with satisfactory results. Among the methods tested as mentioned above, the results obtained by PLS and ITTFA give better accuracy and precision.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1998年第6期243-245,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
国家商检局科学基金
江苏省科学基金资助课题
关键词
钼
锡
锑
吸光光度法
铸铁
模拟样
测定
Molybdenum Tin Antimony Spectrophotometry Partial least squares method Iterative target transform factor analysis method Cast iron
