GB/T 5686.4-2008
AbolishedFerromanganese , ferromanganese-silicon , itrogen-bearing ferromanganese and manganese metal - Determination of phosphorus content - Molybdenum blue photometric method and alkali content titrimetric method
锰铁、锰硅合金、氮化锰铁和金属锰 磷含量的测定 钼蓝光度法和碱量滴定法