Standard No.:	GB 8969-1988
English Name:	Air quality; Determination of nitrogen oxides in ambient air; Griess-saltzman method
Chinese Name:	空气质量 氮氧化物的测定 盐酸萘乙二胺比色法
Chinese Classification:	Z15    Analysis methods for toxic substances in atmosphere
Professional Classification:	GB    National Standard
ICS Classification:	13.040.20 13.040.20    Ambient atmospheres 13.040.20
Issued by:	MEP
Issued on:	1988-03-26
Implemented on:	1988-8-1
Status:	abolished
Superseded by:	HJ 479-2009 Ambient air - Determination of nitrogen oxides - N-(1-naphthyl) ethylene diamine dihydrochloride spectrophotometric method
Superseded on:	2009-11-1
Abolished on:	2009-11-01
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	45.00
Delivery:	via email in 1~3 business day

本方法适用于大气中氮氧化物的测定，检出限为0.05W9/5mL，可测定大气中氮氧化物浓度范围为:0.01一20 mg/ m3。大气中二氧化硫浓度为氮氧化物浓度的10倍时，对氮氧化物的测定无干扰，30倍时，使颜色有少许减褪，但在环境大气中，较少遇到这种情况。臭氧浓度为氮氧化物浓度5倍时，对氮氧化物的测定略有干扰，在采样后3h，使试液呈现微红色。过氧乙酞硝酸醋(PAN)使试剂显色而干扰，在一般环境大气中PAN浓度甚低，不会导致显著误差。