Prezentul standard stabile?te metoda de analiz? spectral? a elementelor existente ?n concentra?ii mici (aluminiu, calciu, magneziu, fier si siliciu) ?n concentratele de sulf nativ de min. 09,0% sulf.
STAS 11359/8-1980 history
1980STAS 11359/8-1980 NATIVE SULPHUR ORES AND CONCENTRATES Aluminium, calcium, magnesium, iron and silicon spectral analysis