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在硫酸厂中的硫酸尾气,用纯碱吸收,可制得副产无水亚硫酸钠。在吸收过程的第一阶段中,吸收液“酸水”中除亚硫酸氢钠外,尚含有少量亚硫酸钠,对其含量的测定一直没有现成的方法。我厂用中和法和碘量法结合进行分析,并通过样液中亚硫酸氢钠的酸碱毫克当量数与氧化还原毫克当量数之间的换算得到了良好的结果,测定方法如下:
Sulfuric acid plant in sulfuric acid tail gas, with soda ash absorption, can be by-product anhydrous sodium sulfite. In the first stage of the absorption process, the absorbing liquid “acid water” contains a small amount of sodium sulfite in addition to sodium bisulfite. There is no ready-made method for the determination of its content. I plant with neutralization method and the combination of iodine method for analysis, and through the sample solution sodium bisulfite acid-base milligram equivalent and milligrams of redox equivalent conversion between the good results obtained, the determination is as follows: