一、氮肥尿素、碳酸铵、碳酸氢铵、氯化铵等氮肥外观都是白色晶体,可用下列方法识别。 1、灼烧法铵态氮肥受热以后都会发生分解。因此,鉴别时可将少量化肥放在铁片上,在火焰上方灼烧。如果产生较浓的具有刺激性气味的氨气,而且不留残渣即为纯度高的氮肥,如果残渣较多,说明含氮量低。 First, nitrogen urea, ammonium carbonate, ammonium bicarbonate, ammonium chloride and other nitrogen appearances are white crystals, the following methods can be identified. 1, Burning method ammonium nitrogen fertilizer will be decomposed after heating. Therefore, the identification of a small amount of fertilizer can be placed on the iron sheet, burning in the flame above. If you produce a strong smell of ammonia gas, and without leaving a residue of high purity nitrogen fertilizer, if the residue is more, indicating a low nitrogen content.