摘要
以Ｈ２Ｏ２氧化Ｉ－作为指示反应，可用催化动力学法通过一次实验同时测定铬与钼．由于铬催化反应的表现反应级数不是常数，因而用多元线性回归法得到的结果误差较大．用主成份回归法由于不需要严格的数学模型，因而可得到满意的结果．研究得出当Ｈ２ＳＯ４，Ｈ２Ｏ２和ＫＩ的浓度分另４为７×１０－３ｍｏｌ／Ｌ，４×１０－４ｍｏｌ／Ｌ，１．５×１０－３ｍｏｌ／Ｌ时，可同时测定混合液中４．５×１０－６～１．２×１０－６ｍｏｌ／Ｌ的Ｃｒ（Ⅵ）和２×１０－７～１×１０－６ｍｏｌ／Ｌ的Ｍｏ（Ⅵ）．相对误差小于１０％．
Cr and Mo arc determined simultunoously by catelytic kinetics through a single run,with the reaction between H2O2 and I-as the indicator reaction.Since tho apparent order of Cr-catalyzed reaction is not a constsnt,theresults calculated with multiple linear regression method come out with quite large errors.Principal Component Regression,for which it is not necessary to get the exact mathematical form of v as the function of A,was used to treat the data and in this way satisfactory results were obtsined.In our study, when the concentrations of H2SO4,H2O2 and KI were 7×10-3,4×10-4 and 1.5×10-3 mol/Lrespectively,4.5×10-6- 1.2×10-5 mol/L Cr and 2×10-1×10-6 mol/L Mo werodetermined simultaneously.The relative error is not more than 10 %.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
1995年第2期210-215,共6页
Journal of Tongji University:Natural Science
关键词
铬
钼
催化动力学法
主成份回归
Chromium
Molybdenum
Catelytic kinetics method
Principal component regression
Simultaneous detormination
