2015DL/T 422-2015 Test method for HC1 used in fossil-fired power plant
1991DL 422.3-1991 Determination of iron content in industrial hydrochloric acid - Phenanthroline spectrophotometric method
DL 422.3-1991 Determination of iron content in industrial hydrochloric acid - Phenanthroline spectrophotometric method was changed to DL/T 422-2015 Test method for HC1 used in fossil-fired power plant.