同时测定三辛胺和三辛胺盐酸盐的双波长分光光度法

Dual_wavelength Spectrophotometric Determination of Tri_n_octylamine and Its Hydrochloride Salt

提出了利用双波长分光光度法测定三辛胺（ＴＯＡ）及三辛胺盐酸盐（ＴＯＡ·ＨＣｌ）的一种新方法，即ＴＯＡ和ＴＯＡ·ＨＣｌ在ＣＣｌ４溶液中与Ｉ２生成电荷转移化合物，其最大吸收波长分别为２９３ｎｍ和２６３ｎｍ，两组分同时存在时可利用吸光度的加和性得联立方程，分别求出两组分的含量。ＴＯＡ含量在０～３５ｍｇ／Ｌ，ＴＯＡ·ＨＣｌ含量在０～３１ｍｇ／Ｌ范围内符合比耳定律。该法简便快速，方法的回收率为９５．５％～１０４．６％。

A new dual _ wavelength spectrophotometric method for the determination of tri _n_ octylamine(TOA) and its hydrochloride salt(TOA·HCl) is presented. TOA and its hydrochloride salt can react with iodine to form charge _ transfer complexes with maximum absorbencies at 293 nm and 263 nm, respectively. The contents of TOA and TOA·HCl in their mixed solution can be calculated from simultaneous equations based upon the additivity of their absorbencies. Beer’s law is obeyed in the range of 0～35 mg·L-1 for TOA and 0～31 mg·L-1 for TOA·HCl. The method is simple and sensitive and rapid. The recovery of 95.5%～104.6% can meet the requirement of routine analyses.