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.
出处
《化学试剂》
CAS
北大核心
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)
