基于铝与铬菁R显色体系对水溶液中的磷酸根的识别与检验  

Recognition and Detection of Phosphate in Aqueous Solution by the Chromogenic System of Al(Ⅲ)Ion and Eriochrom Cyanine R

作　　者：张沁薇 薛妍[1] 刘鑫[1] 何少华[1] 闵瑞[1] 庞海霞[1] 

机构地区：[1]陕西理工学院化学与环境科学学院,陕西汉中723001

出　　处：《广东化工》2016年第16期46-47,共2页Guangdong Chemical Industry

基　　金：地方高校国家级大学生创新创业训练计划项目(201510720571)

摘　　要：本实验利用竞争取代原理,在溴化十二烷基三甲基铵阳离子表面活性剂的存在下,研究了铝与铬菁R显色体系对不同阴离子的显色性能。结果表明:室温条件下,Al^(3+)与铬菁R形成稳定的蓝色配合物,当向其中加入HPO_4^(2-)和H_2PO_4^-可与Al^(3+)形成无色配合物,从而使原显色体系由蓝色变为橘红色,吸收光谱发生明显变化,而同等条件下其他常见阴离子并不能产生这种变化。从而建立了一种选择性识别水中磷酸盐的新方法。本方法操作简便快速,磷酸盐在0.4×10^(-5)~8.0×10^(-5)mol·L^(-1)范围内符合朗伯-比尔定律,可用于水溶液中磷酸根总量的测定。Color performance of the chromogenic system of Al（Ⅲ）Ion and eriochrom cyanine R with inorganic salts has been studied .The results showed that Al^3＋ and eriochrom cyanine R formed blue complexes, because of competite and substitute, a clear color change was observed from blue to red upon addition of phosphate to the chromogenic system. However, no obvious color and absorption spectrum changes were observed on addition of other inorganic salts, So a new method of selective recognition and detection phosphate ion in aqueous solution was established. This method simple and efficient, Beer＇s law is obeyed in the range of 0.4×10^-5-8.0×10^-5 mol·L^-1 for HPO4^2-. The method can be used for the direct detection of HPO4^2- in aqueous solution with satisfactory results.

关 键 词：选择性识别 显色体系 水溶液 铬菁R 磷酸根 阳离子表面活性剂 H2PO4^- 朗伯-比尔定律 

分 类 号：O657.32[理学—分析化学]