基于偶联反应极谱法测定痕量NO_2^-的研究(一)以间苯二酚为偶联试剂

Determination of Trace Amount Nitrite by Polarography Based on the Azo—Reaction 1. resorein as azo—reaagent

本文研究在碱性介质中,NO_2^-磺胺重氮盐与间莱二酚进行偶联反应的最佳实验条件,从而建立了一个灵敏、快速测定痕量NO_2^-离子的分析方法。线性范围为10～100ppb,常见离子对NO_2^-测定没有干扰。用于各种水样中NO_2^-含量的测定,获得满意结果。

The experimental conditions were studied to determine nitrite by the DPP or 2.5th order differential electroanalysis in alkaline mediun based on the azo—reaction. The quantiative method which determines directly the trace amount of nitrite in water was. recommended. The limeear calibration curve was obtained for 1.0×10^(-8)-8.0×10^(-7)g/mL. 2800 times NO_3^- ion for the determination of nitrite does not interfcre under the experimental conditions. The method is simple,rapid,sensitive and reproducible.