DL 422.3-1991
SH/T 0963-2017
GB/T 11198.3-1989
Sulphuric acid for industrial use--Determination of iron content--O-Phenanthroline spectrophotometric method
GB/T 3049-1986
Chemical products for industrial use—General method for determination of iron content—o-Phenanthroline spectrophotometric method
GB/T 4348.3-1984
Sodium hydroxide for industrial use--Determination of iron content--o-phenanthroline photometric method
GB/T 6276.6-1986
Ammonium hydrogen carbonate for industrial use—Determination of iron content—O-Phenanthroline spectrophotometric method