多元线性回归法测定亚甲基蓝聚合的热力学参数  

Determination of Thermodynamic Parameters in Methylene Blue Aggregation by a Multiple Linear Regression Method

作　　者：王慧[1] 赵学财[1] 张春荣[1] 申大忠[1] 

机构地区：[1]山东师范大学化学化工与材料科学学院,山东济南250014

出　　处：《常熟理工学院学报》2010年第2期48-51,共4页Journal of Changshu Institute of Technology

基　　金：山东省自然科学基金(No.Y2007B03)资助项目

摘　　要：亚甲基蓝是吸附研究中最为常用的模型被吸附物,但它在溶液中存在自聚平衡,其吸收光谱随染料浓度的改变而变化,致使光度法测定其浓度可能存在较大的系统误差.本文以多元线性回归方法分析亚甲基蓝的光谱数据,求解出亚甲基蓝单体及二聚体的吸收光谱,测得二聚反应的平衡常数、焓变(△H)和熵变(△S)分别3680L/mol(25℃),-29.7kJ.mol^(-1)和-31.5J.mol^(-1).K^(-1).Methylene blue （MB） is a model adsorbate that is commonly used in adsorption investigations. But the absorptive spectrum of MB solution is dependent on the concentration due to the aggregation of dye itself. As a result, there may be a rather large systemic error in determination of the concentration of MG by a speetrometrie method. In this paper the spectrum data of MG were analyzed by a multiple linear regression method. The absorptive spectrum of monomer and dimer of MB were estimated. The equilibrium constant, enthalpy change （△H） and entropy change （△S） of the dimerization of MB are 3680L/mol （25 ℃）, -29.7kJ.mo1^-1 and -31.5 J.mol^-1.K^-1, respectively.

关 键 词：聚合常数 亚甲基蓝 多元线性回归 

分 类 号：O657[理学—分析化学]