偏最小二乘-速差动力学分光光度法同时测定Sn^(2+)与Sn^(4+)  

Simultaneous Determination of Sn^(2+) and Sn^(4+) by Partial Least Squares-speed Difference Dynamics-spectrophotometry

作　　者：周彩荣[1] 刘中平[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001

出　　处：《郑州大学学报（理学版）》2015年第1期97-102,共6页Journal of Zhengzhou University:Natural Science Edition

基　　金：河南省教育厅重点科技攻关项目;编号13A530712

摘　　要：用紫外-可见分光光度计考察了溶液中Sn2+和Sn4+与邻苯二酚紫(PCV)的显色反应随时间变化情况,结果表明两种离子都能与PCV发生络合反应,两种离子在显色动力学上有着明显的差异,Sn4+和Sn2+与PCV分别在11 min和45 min显色完全并趋于稳定.干扰试验结果证明,在溶液中,加入10倍Sn4+浓度的葡萄糖酸,不会造成对显色反应的影响.根据实验数据建立了偏最小二乘法预测模型,用此模型对9组已知浓度的Sn Cl2和Sn Cl4混合溶液进行了预测,结果表明当在1.62<[Sn2+]/[Sn4+]<32.52范围内,该模型预测两种离子的浓度与实测值相吻合.用偏最小二乘-速差动力学分光光度法分析自制葡萄糖酸亚锡产品的总锡含量为37.53%,亚锡含量为34.26%.The chromogenic reaction of Snz＋ and Sn4＋ with PCV was examined by ultraviolet-visible spectrophotometer. The results showed that there was an obvious difference in ehromogenic reaction dy- namics. The chromogenic reaction of Sn4＋ with PCV was completed in 11 min, and Sn2＋ in 45 min. In- terference test results showed that the glucose acid in the solution did not affect the chromogenic reaction. Partial least squares-speed differential kinetics spectrophotometry model was established based on the ex- perimental data. Nine sets of mixed solution of SnC12 and SnC14 known concentration were predicted by u- sing the model, the results showed that the calculation values on both ions concentration was in conformity with the simultaneous determination values when 1.62 〈 [ Sn2 ＋ ] / [ Sn4 ＋ ] 〈 32.52. The total tin content of homemade stannous glueonate product was 37.53%, Sn2＋ content was 34.26% by using partial least squares-speed differential kinetic speetrophotometry.

关 键 词：分光光度法 偏最小二乘法 速差动力学 Sn2+ Sn4+ 

分 类 号：O657.32[理学—分析化学]