GB/T 15341-2023

GB/T 17513-1998 Realgar and orpiment GB/T 1873-1995 Phosphate rock and concentrate--Determination of silicon dixide content--Gravimetric and volumetric methods GB/T 1874-1995 Phosphate rock and concentrate--Determination of acid insoluble content--Gravimetric method GB/T 1872-1995 Phosphate rock and concentrate--Determination of fluorine content--Specific ion electrode method GB/T 1871.5-1995 Phosphaterock and concentrate--Determination of magnesium oxide content--Flame atomic absorption spectrometric and volumetric methods GB/T 1871.4-1995 Phosphate rock and concentrate--Determination of calcium oxide content--Volumetric methods GB/T 1868-1995 Phosphate rock and concentrate--Methods of sampling and preparing sample GB/T 13551-1995 Phosphate rock and concentrate--Determination of cadmium oxide content--Flame atomic absorption spectrometric method