Chemical reagent hydrochloric acid

 The degree of consistency between "Chemical Reagent: Hydrochloric Acid (GB/T 622-2006)" and ISO 6353-2: 1983 R13 "hydrochloric acid" is not equivalent. This standard replaces GB/T 622-1989, and compared with GB/T 622-1989, the main changes are as follows: Appearance is changed to chromaticity (3.2 and 4.2 in the 1989 edition; Chapter 4 and 5.3 in this edition); Ignition residue , Sulfate, iron, and arsenic are determined by the general method of chemical reagents