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冷却水中NaNO2与定量过量KMnO4溶液反应后，过量的KMnO4经光度法测定，在工作曲线上即可查出其含量。测定范围为1250～2500mg／L，测定结果的相对误差小于3％，优于KMnO4直接滴定法。方法简便、快速、可靠，适于现场使用。
Cooling water NaNO2 and quantitative excess KMnO4 solution reaction, the excess KMnO4 by spectrophotometry, the working curve can be found on the content. The determination range of 1250 ~ 2500mg / L, the relative error of the determination results less than 3%, better than KMnO4 direct titration. The method is simple, fast, reliable and suitable for on-site use.