溴酸钾-亚硝酸根-锌试剂催化体系测定痕量亚硝酸根
[Determination of trace nitrite by KBrO3-NO2(-)-zincon catalytic system].
作者信息
Liu Chang-zeng
机构信息
Department of Chemistry, Linyi Teacher's College, Linyi 276005, China.
出版信息
Guang Pu Xue Yu Guang Pu Fen Xi. 2003 Apr;23(2):348-50.
A new catalytic kinetic spectrophotometric method for the determination of trace nitrite based on the oxidation reaction between KBrO3 and Zincon in H3PO4 medium has been developed. The optimum conditions for the rate of the reaction were studied, and the rate equation of the reaction was found to be -dcZincon/dt = k'cZincon.cBrO3-.CNO2-. The apparent activation energy and the apparent rate constant were 33.13 kJ.mol-1 and 1.32 x 10(-3).s-1, respectively, the detection limit was 6.0 x 10(-10) g.mL-1, and the range of determination was 0.60-30.00 micrograms.L-1. The method has been used to determine trace nitrite in water with satisfactory result.
基于在磷酸介质中溴酸钾与锌试剂之间的氧化反应，建立了一种测定痕量亚硝酸盐的新型催化动力学分光光度法。研究了反应速率的最佳条件，发现反应速率方程为 -dc锌试剂/dt = k'c锌试剂·c溴酸根·c亚硝酸根。表观活化能和表观速率常数分别为33.13 kJ·mol-1和1.32×10(-3)·s-1，检测限为6.0×10(-10) g·mL-1，测定范围为0.60 - 30.00 μg·L-1。该方法已用于测定水中痕量亚硝酸盐，结果令人满意。
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