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正硅酸(或氟硅酸),在适宜酸度下与钼酸铵形成黄色的钼硅络离子,加入稳定剂后,在420nm处测定吸光度,借此作硅的测定。钼黄法灵敏度低,应用于测定高硅时毋需分取试样溶液,操作简便、准确性较好。操作方法称取试样0.0500g置于300m1聚四氟乙烯烧杯中,加入硝酸(1+1)6ml,立即用氟塑料量筒加入2ml氢氟酸,仔细目测检查,试样溶解完毕后加入饱和硼酸溶液40ml,钼酸铵溶液(10%)25ml,沸水100ml,丙
Positive silicic acid (or fluorosilicic acid), under appropriate acidity and ammonium molybdate form yellow molybdenum silicon complex ions, after adding a stabilizer, the absorbance was measured at 420nm, whereby the determination of silicon. Molybdenum yellow method with low sensitivity, used in the determination of high silicon without the need to take the sample solution, easy to operate, the accuracy is better. Method of operation Weigh 0.0500g sample placed 300m1 Teflon beaker, add nitric acid (1 + 1) 6ml, fluorine plastic cylinder was immediately added 2ml hydrofluoric acid, careful visual inspection, the sample was dissolved after the addition of saturated boric acid Solution 40ml, ammonium molybdate solution (10%) 25ml, boiling water 100ml,