基于铝与铬菁R显色体系对水溶液中C_2O_4^(2-)的识别与检测  

Recognition and Detection of Oxalate in Aqueous Solution by the Chromogenic System of Al^(3+) and Eriochrom Cyanine R

作　　者：刘鑫[1] 何少华[1] 闵瑞[1] 庞海霞[1] 

机构地区：[1]陕西理工大学化学与环境科学学院陕西省催化基础与应用重点实验室,陕西汉中723000

出　　处：《化学试剂》2016年第11期1089-1091,共3页Chemical Reagents

基　　金：国家自然科学基金资助项目(21373132);陕西省科技厅自然科学基金项目(2015JM2060);地方高校国家级大学生创新创业训练计划项目(201510720571);教育厅2015年科学研究项目(15JK1141)

摘　　要：建立了一种以铝与铬菁R为显色体系,选择性识别检测水中草酸根离子的新方法。在烷基三甲铵类阳离子表面活性剂的存在下,当向Al3+与铬菁R形成的蓝色配合物显色液中加入草酸根离子时,由于竞争取代,草酸根离子与Al3+形成无色配合物,溶液颜色由蓝色变为铬菁R自身的红色,吸收光谱也发生明显变化,其他如Cl-、Ac-、SO2-4、NO-3等常见阴离子则均未引起明显的光谱及溶液颜色变化,从而实现了对C_2O_4^(2-)的裸眼识别。且草酸根浓度在0.4×10-5~2.0×10-5mol/L范围内,浓度与吸光度符合朗伯比尔定律,实现了对水溶液中草酸根的快速检测。A new method of selective recognition and detection oxalate ion in aqueous solution was established based on the chromogenic system of Al^3 ＋and eriochrom cyanine R. Al3 ＋and eriochrom cyanine R formed blue complexes. Due to competition and substitute,a clear color change was observed from blue to red upon addition of C_2O_4^2- to the chromogenic system. However,no obvious color and absorption spectrum changes were observed on addition of other inorganic salts such as Cl^-,Ac^-,SO4^2-,NO3^-and so on,so C_2O_4^2-was perceptible to recognition by naked eye. This method simple and efficient,Beer＇s law is obeyed in the range of 0. 4 × 10^（- 5）～ 2. 0 × 10^（- 5）mol / L for C_2O_4^2-. The method can be used for the direct detection of C_2O_4^2- in aqueous solution with satisfactory results.

关 键 词：草酸根离子 检测 AL^3+ 铬菁R 

分 类 号：O657.32[理学—分析化学]