GB/T 5686.4-2022
錳鐵、錳硅合金、氮化錳鐵和金屬錳 磷含量的測定 鉬藍分光光度法和鉍磷鉬藍分光光度法
Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal—Determination of phosphorus content—Molybdenum blue spectrophotometric method and bismuth phosphomolybdate b
GBT5686.4-2022, GB5686.4-2022