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碳酸氢铵是我国近年来新发展的化肥.由于其生产设备和制法比较简单,原料易得,成本较低,运输和施用比氨水方便,肥效(按N量计)亦与硫酸铵等相当,我国北京、上海、南京等地均已设厂生产;不少小型合成氨厂也拟改为生产碳酸氢铵.碳酸氢铵的品质指标主要是铵态氮和水分含量.但是,通常用以测定铵态氮的甲醛滴定法不能适用于极弱酸的铵盐,测定水分的烘干法等也不能适用于挥发性的样品.本文目的即在于改进甲醛法(或酸碱滴定法〕和试用碳化钙气量法以鉴定碳酸氢铵的品质.
Ammonium bicarbonate is a new fertilizer developed in recent years in our country.Because of its relatively simple production equipment and manufacturing method, raw materials are easy to obtain, the cost is lower, the transportation and application are more convenient than ammonia, and the fertilizer efficiency (by N) is also equivalent to ammonium sulfate , China’s Beijing, Shanghai, Nanjing and other places have been set up factories; many small ammonia plant is also intended to produce ammonium bicarbonate. Ammonium bicarbonate quality indicators are mainly ammonium nitrogen and moisture content, but is usually used to determine Formaldehyde titration of ammonium nitrogen can not be applied to the ammonium salt of very weak acid, the determination of moisture drying method can not be applied to volatile samples.The purpose of this paper is to improve the formaldehyde method (or acid-base titration method) and the trial of calcium carbide Gas method to identify the quality of ammonium bicarbonate.