GB/T 4699.3-2007
铬铁、硅铬合金和氮化铬铁.磷含量的测定.铋磷钼蓝分光光度法和钼蓝分光光度法
Ferrochromium, silicochromium and nitrogen-bearing ferrochromium.Determination of phosphorus content.Molybdobismuthylphosphoric blue speckophotometric method and the molybdenum blue spectrophotometric method