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读了“化学世界”1959年第六期所载张德福同志的“氯化铵的测定”一文,我们认为用硝酸银定氯根法计算氯化铵含量,把总氯完全换算成氯化铵,而没有减去氯化钠的含量,显然不是正确的。我厂自去年大跃进以来也大量生产氯化铵,我们参照苏联的国家标准制订了自己的技术条件,现介绍于后,以供参考。1.总氯的测定精确称取试样2～3克,于500毫升量瓶中,加水稀至标线,摇匀。取25毫升于250毫升锥形瓶中,加入5毫升10%硝酸,再加40毫升0.1N 硝酸银标准溶液和2毫升20%铁铵矾溶液,以0.1N 硫氰酸钾标准溶液滴定至粉红色终点为止。
We read “Determination of Ammonium Chloride” by Comrade Zhang Defu contained in “Chemistry World”, No. 6, 1959, and we think that the content of ammonium chloride should be calculated by the method of silver nitrate, and the total chlorine should be completely converted into ammonium chloride. Without subtracting the content of sodium chloride, apparently not right. Since the Great Leap Forward last year, our factory also mass-produced ammonium chloride. We formulated our own technical conditions with reference to the national standards of the Soviet Union and are introduced hereafter for reference. 1. Determination of total chlorine accurately weighed sample 2 to 3 grams in 500 ml volumetric flask, dilute water to the mark, shake. Take 25 ml in a 250 ml conical flask, add 5 ml of 10% nitric acid, add 40 ml of 0.1 N silver nitrate standard solution and 2 ml of 20% ferric ammonium alum solution, titrate with 0.1 N potassium thiocyanate standard solution to pink End of color so far.