GB/T 6730.7-2016
铁矿石 金属铁含量的测定 磺基水杨酸分光光度法
SODIUM CHLORIDE. DETERMINATION OF FLUORIDE CONTENT. PHOTOMETRIC METHOD WITH SODIUM 2-(SULFOPHENYLAZO)-1,8 DIHYDROXYNAPHTHALENE-3,6 DISULFONATE (SPADNS).