HG/T 5615-2019
GB/T 6730.37-2017
Iron ores—Determination of cobalt content—4-[(5-chloro-2-pyridyl)azo]-1,3-diamino-benzene spectrophotometric method
HG/T 5612\uff5e5615-2019
HJ 550-2015
HJ550-2015
HJ 550-2009
GB/T 11220.1-1989
Determination of uranium in soil--CL-5209 extractant-containing resin separation 2-(5-bromo-2-pyridylazo)-5-diethlaminophenol spectrophotometry
GB/T 11067.4-1989
Silver—Determination of antimony content—2-(5-bromo-2-pyridylazo)-5-diethylaminophenol spectrophotometric method
GB/T 14506.26-1993
Silicate rocks—Determination of cobalt content—4-[(5-Chtoro-2-pyridyl)-azo]-1,3-diamino benzene photometric method
GB/T 6730.37-1986
Methods for chemical analysis of iron ores The 4-[(5-chloro-2-phridyl)azo]-1,3-diaminobenzene photometric method for the determination of cobalt content
EJ/T 267.4-1984
JB/T 6237.4-1992
HG/T 4875~4877-2016
HG/T 4876-2016
3-Aminopyridine for industrial use
HG/T 4877-2016
4-Aminopyridine for industrial use
HG/T 4875-2016
2-Aminopyridine for industrial use
20060995-T-467
GB/T 32159-2015
Coking pure pyridine
GB/T 27567-2011
Pyridine for industrial use
GB/T 24199-2009
Refined pyridine - Determination of pyridine content - Gas chromatographic method