碘量法测亚硝酸盐的方法研究

The Method of Measuring Nitrite by Iodometry

本文主要是对碘量法测亚硝酸盐的方法进行了研究,分析了碘量法测亚硝酸盐在不同条件下对回收率的影响,一般来说,影响碘量法测亚硝酸盐的因素主要有:Ph值、淀粉的用量、温度、时间等。通过实验对各个因素进行研究,得出了最佳实验条件为:调节亚硝酸盐溶液的Ph为4,加入过量的0.01 mg/ml碘化钾,反应4分钟,滴加硫代硫酸钠至黄色变为浅色,再加入4 ml 0.5%的淀粉,继续滴加硫代硫酸钠至蓝色变为无色。本文进一步研究了在最佳条件下亚硝酸盐的适用范围为0.01~0.2 g/l。

The purpose for this article is to analyze the influence for the recovery rate by using iodometry to measuring the nitrite under different conditions. In general, Ph value, starch amount, temperature and time are all key points to influence this experiment. After test on these points, we find the optimal experimental conditions: adjust the Ph value of the nitrite solution to 4, add an excess of 0.01 mg/ml potassium iodide, react for 4 minutes, add sodium thiosulfate until the yellow color becomes light, then add 4 ml 0.5% starch solution, and continue to add sodium hyposulfite until blue turns to colorless. In this paper, we further studied that the application range of nitrite under the optimum conditions was to be 0.01 - 0.2 g/l.