维多利亚蓝B与十二烷基磺酸钠相互作用的表征及应用  

Spectrophotometric measurement of sodium dodecylsulfonate based on its attraction for victoria blue B

作　　者：王红艳[1,2] 刘祥虎[2] 李珏燃[2] 黄亚楠[2] 

机构地区：[1]宿州学院,自旋电子与纳米材料安徽省重点实验室培育基地,安徽宿州234000 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境污染与防治》2008年第4期27-30,共4页Environmental Pollution & Control

基　　金：同济大学污染控制与资源化研究国家重点实验室开放课题(No.PCRRF07001)

摘　　要：在pH=4.00的缓冲溶液中,阴离子表面活性剂十二烷基磺酸钠(SDS)形成带负电荷的胶束,阳离子分子探针维多利亚蓝B(VBB)通过静电作用可吸附在带负电荷的胶束表面上。研究结果表明,VBB在SDS胶束表面上的吸附符合Langumir吸附方程,VBB与SDS之间具有较强的作用,为单分子层吸附,结合常数(K)为2.43×106L/mol;较高盐度下,VBB分子间发生自聚,结合比(γ)有一定程度的上升;较高温度加快了VBB分子的解吸速度,γ随着温度的升高而下降;利用VBB与SDS之间的相互作用,结合光吸收比差法,对水样中阴离子表面活性剂浓度进行了测定,方法检测限为0.027mg/L;干扰实验和水样测定结果表明,该方法具有较好的选择性和准确度,是一种测定水体中阴离子表面活性剂浓度的快捷简便的方法。In pH 4.00 buffer solutions, sodium dodecylsulfonate （SDS） forms micelles with negative charges which attract positively charged Victorial Blue B （VBB）. The experimental data of adsorption of VBB on SDS were well represented by the monomolecular layer Langmuir absorption isotherm model （K=2.43 × 10^6 L/mol）. At a high concentration of electrolyte, VBB would form polymers resulting in a higher binding number （γ）, which would decrease at a higher temperature due to the faster rate of VBB desorption. An efficient new method for measuring SDS was developed based on its attraction for VBB; the SDS concentration was estimated from the ratio of visible light absorbances measured at 616 nm and 676 nm. The method＇s limit of detection was 0. 027 mg/L. This highly selective and accurate method is attractive for measuring the anionic surfactant in aqueous samples.

关 键 词：光谱修正 光吸收比差 维多利亚蓝B 阴离子表面活性剂 

分 类 号：O647.2[理学—物理化学]