溴酸钾-酸性铬蓝K化学发光法检测水中微量NO_2^-  

Determination of Trace Nitrite in Water Using Potassium Bromate-Acid Chrome Blue K Chemiluminescence Method

作　　者：吴婉娥[1] 王天生[1] 张泽洋[1] 

机构地区：[1]第二炮兵工程学院503教研室,西安710025

出　　处：《分析科学学报》2008年第3期327-330,共4页Journal of Analytical Science

摘　　要：利用NO2-对溴酸钾-酸性铬蓝K体系的化学发光有显著的增强作用,建立了检测亚硝酸盐的新方法。着重对化学发光条件,包括溴酸钾浓度、酸性铬蓝K浓度、管长、流速及酸度条件进行了实验研究,并利用该方法对地下水及当地雨水进行了检测。实验结果表明,当溴酸钾浓度为0.1 mol/L、酸性铬蓝K浓度为1.0×10-4mol/L、管长为40 cm、流速为2.5 mL/min及硫酸为0.5 mol/L时,本方法检测NO2-的线性范围为1.0×10-8~8.0×10-5mol/L,检出限为1.1×10-10mol/L;对1.0×10-7mol/L和1.0×10-5mol/L的NO2-进行11次平行测定,相对标准偏差分别为1.6%和2.1%;对天然水中NO2-检测,结果满意。对化学发光机理进行了初步探讨。A chemiluminescence method for the determination of nitrite in water is established. The method is based on the enhancement of nitrite on the chemiluminescence reaction among acid chrome blue K and potassium bromate in acid medium. The chemiluminescence reaction conditions including the concentration of potassium bromate and acid chromate blue K, the length of tube, the velocity of solution flow and the concentration of vitriol solution has been investigated. Under the optimal conditions, the linear range for nitrite is 1×10^-8～8×10^-5 mol/L with a detection limit of 1.1×10^-10 mol/L, the relative standard deviation was 1.6% for 1×10^-7 mol/L NO2^- , and 2.1% for 1×10^-5 mol/L NO2^-. This method has been used to determine nitrite in water with satisfactory results. The chemiluminescence mechanism is also discussed briefly.

关 键 词：流动注射 化学发光 亚硝酸盐 溴酸钾 

分 类 号：O657.39[理学—分析化学]