摘要
本文研究了上文提出催化光度测定硒的有关机理。非离子表面活性剂(NSF)对硒催化S^(2-)还原亚甲基蓝(MB)退色产生胶束催化作用。首先,MB与NSF形成带阳电的混合胶束(NSF-MB)。在此,MB增溶于NSF胶束的栅状层和聚氧乙烯外壳,然后,〔S…Se°〕^(2-)被吸附于此混合胶束的界面。由于增溶和吸附的双重富集作用,使胶束界面反应物的浓度大大提高,从而促进了反应速率。反应速度增加的大小,决定于形成NSF-MB混合胶束的难易(这又决定于NSF的憎水基的结构)及〔S…S°〕^(2-)和〔S…Se°〕^(2-)在此混合胶束界面吸附能力的大小。
The mechanism of the titled method is studied and discussed. The catalytic effect on the catalysis of selenium on the decoloration reaction between S^(2-) and methylene blue(MB)is originated from the micellar catalysis. At first,MB forms cationic mixed micelle with Triton X-100, in which MB solubilized in the palisade layer and polyethylene shel of Triton X-100 micelle, and then,〔S…Se°〕^(2-) is adsorbed on the interface of the mixed micelle. In virtue of concentration effect by means of solubilization and adsorption, the concentration of the reactants is greatly increased, thus the reaction rate is promoted. The degree of enhancement of the reaction rate is dependent on the suitability of the mixed micelle formation which is in turn dependent on the structure of the nonionic surfactants used as well as the adsorbability of〔S…Se°〕^(2-) in the interface of the mixed micelle.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1990年第9期821-826,共6页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金
浙江省自然科学基金
关键词
硒
胶束
流动注射
光度法
毛发
Micellar catalysis
Mixed micelle
Adsorption
