GB/T 223.70-1989 Methods for chemical analysis of iron,steel and alloy--The o-phenanthroline spectrophotometric method for the determination of iron content (English Version)
This standard specifies the spectrophotometric method for the determination of iron content by phenanthrene and roline. This standard applies to the determination of iron content in superalloys and precision alloys. Measuring range: 0.10% to 1.00%.
GB/T 223.70-1989 history
2008GB/T 223.70-2008 Iron,steel and alloy.Determination of iron contents. o-Phenanthroline spectrophotometric method
1989GB/T 223.70-1989 Methods for chemical analysis of iron,steel and alloy--The o-phenanthroline spectrophotometric method for the determination of iron content