Standard No.:	GB 7478-1987
English Name:	Water quality; Determination of ammonium; Distillation and titration method
Chinese Name:	水质 铵的测定 蒸馏和滴定法
Chinese Classification:	Z16    Analysis methods for toxic substances in water
Professional Classification:	GB    National Standard
Issued by:	State Environmental Protection Administration
Issued on:	1987-03-06
Implemented on:	1987-8-1
Status:	superseded
Superseded by:	HJ 537-2009 Water quality-Determination of ammonia nitrogen-Distillation-neutralization titration
Superseded on:	2010-4-1
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	45.0
Delivery:	via email in 1~3 business day

本标准适用于饮用水及废水中铵的测定。采用10ml试份，可测定试份中铵氮含量高达10mg，相当于样品浓度高达1000mg/L。最低检出浓度：使用250ml试份，实际测定的（自由度为4）最低检出浓度为含氮0.2mg/L。灵敏度：使用100ml试份1.0ml 0.02mol/L的盐酸相当于含氮2.8mg/L。干扰：尿素可能是主要干扰，它在规定条件下以氨馏出，从而引起结果偏高，挥发性胺类也引起干扰，他们会被馏出并在滴定时与酸反应，因而使结果偏高。氯化样品中存在的氯胺亦会以这种方式被测定。