| Standard ID | DL 422.3-1991 (DL422.3-1991) |
| Description (Translated English) | Determination of iron content in industrial hydrochloric acid - Phenanthroline spectrophotometric method |
| Sector / Industry | Electricity & Power Industry Standard |
| Classification of Chinese Standard | G11 |
| Date of Issue | 1991/10/1 |
| Date of Implementation | 1992/4/1 |