GB 223.31-1984 Methods for chemical analysis of iron,steel and alloy--The distillation-molybdenum blue photometric method for the determination of arsenic content (English Version)
2008GB/T 223.31-2008 Iron,steel and alloy.Determination of arsenic content.Distillation-molybdenum blue spectrophotometric method
1994GB/T 223.31-1994 Methods for chemical analysis of iron, steel and alloy.The distillation-molybdenum blue spectrophotometric method for the determination of arsenic content
1984GB 223.31-1984 Methods for chemical analysis of iron,steel and alloy--The distillation-molybdenum blue photometric method for the determination of arsenic content
GB 223.31-1984 Methods for chemical analysis of iron,steel and alloy--The distillation-molybdenum blue photometric method for the determination of arsenic content was changed to GB/T 223.31-1994 Methods for chemical analysis of iron, steel and alloy.The distillation-molybdenum blue spectrophotometric method for the determination of arsenic content.