对硝基苯偶氮间苯二酚与季铵盐型表面活性剂显色反应的分光光度法研究  

Study on the chromogenic reaction of quaternary ammonium surfactants with (pnitropkenyl-azo) resorcinol in spectropkotometric method

作　　者：杨文初[1] 周华方[1] 

机构地区：[1]徐州医学院化学教研室,徐州师范学院化学系

出　　处：《化学试剂》1995年第6期339-341,共3页Chemical Reagents

摘　　要：应用分光光度法研究了季铵盐型表面活性剂ＣＰＢ、ＣＴＭＡＢ以单分子及胶束形式与对硝基苯偶氮间苯二酚的显色反应。认为单分子或胶束与对硝基苯偶氮间苯二酚的反应均为离子综合机理，缔合比均为２：１，且造成对硝基苯偶氮间苯二酚的吸收光谱相同波数的红移，但形成胶束后εｍａｘ和对硝基苯偶氮间苯二酚的Ｋａ２增加的更大。The mechanism,characteristics and analyticalapplications of the chromogenic reactions of cetylpyridinium bromide(CPB)and cetyltrimethylammoniumbromide(CTMAB)with(p-nitrophenyl-azo)-resorcinol(PNPAR)were investigated respectively. Bothsingle molecular and micellar surfactants could makethe same red shift in the absorption spectrum ofPNPAR, the association ratio with PNPAR being2:1.The influence of single molecular surfactant onpKa2, εmax of PNPAR was different from that ofthe micellar one.

关 键 词：显色反应 光度法 CPB CTMAB PNPAR 

分 类 号：O657.32[理学—分析化学]