2－羟基－3－羧基－5－磺酸基苯重氮氨基偶氮苯与阳离子表面活性剂显色反应的研究

A STUDY ON THE CHROMOGENIC REACTION OF 2-HYDROXY-3-CARBOXY-5-SULFOBENZENEDIAZOAMINOAZOBNZENE WITH CATIONIC SURFACTANTS

研究了溴化十六烷基三甲胺（ＣＴＭＡＢ）、溴化十六烷基吡啶（ＣＰＢ）、氯化十六烷基吡啶（ＣＰＣ）、氯化十四烷基二甲基苄基胺（Ｚｅｐｈ）等四种阳离子表面活性剂（ＣＳＦ）与２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氨苯（ＨＣＳＤＡＡ）的显色反应。＂在ＴｒｉｔｏｎＮ－１０１存在下和ｐＨ１１．３～１２．１的缓冲介质中，各种ＣＳＦ均与ＨＣＳＤＡＡ形成摩尔比为１：１的紫色离子缔合物，其最大吸收波长是５８５ｎｍ，对比度为１５４ｎｍ，在３２～４０℃时表观摩尔吸光系数都为４．０×１０３Ｌ·ｍｏｌ－１·ｃｍ－１。ＣＳＦ在２×１０－６～１．０×１０－４ｍｏｌ／Ｌ范围内服从比尔定律。在ＥＤＴＡ的掩蔽作用下，大量常见离子对反应不干扰。可望用于阳离子型和阴离子型表面活性剂的分析。

The color reaction of several cationic surfactants(CSF),i.e.,hexadecyltrimethy lammonium bromide,cetylpyridinium bromide,cetylpyridinium chloride and tetradecyldimethylbenzylammonium chloride,with 2-hydroxy-carboxy-5-sulfobenzenediazoaminoazobenzene(HCSDAA)is studied in detail.In borax buffer medium at PH 11.3～12.1 and in the presence of Triton N-101,the violet ion associate complex of each CSF has a maximum absorption at 585nm and an apparent molar absorptivity of each complex is 4.0 × 103L·mol-1cm-1 at 32～ 40℃. The molar ratio of CSF to HCSDAA in the complex is found to be 1: 1. Beer's law is obeyed in the concentraction range of 2 × 10-6 ～1.0 ×10-4 mol·L-1 for CSF. Most of the common metal ions and anions do not interfere .The application potential of chromogenic reaction for the determination of CSF anionic surfactants is discussed.