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本文研究并提出了硅钼蓝杂多酸在pH为9．6的NH3－NH4Cl缓冲溶液中于-0．44V（vs．SCE）处产生一灵敏的导数极谱波，线性范围在0．005μg／ml～1．0μg／ml，检出限为0．005μg／ml。变异系数为1．45％，回收率为94．1％～104％。本法具有简单、快速、灵敏、较好选择性等特点，可直接用于钢铁中硅的测定或水样的测定。
In this paper, we present a sensitive derivative polarographic wave of silicon molybdate blue heteropoly acid at pH = 9.6 in NH3-NH4Cl buffer solution at -0.44V (vs.SCE) with a linear range of 0.005μg / Ml ~ 1.0μg / ml, the detection limit of 0.005μg / ml. The coefficient of variation was 1.45%, the recovery was 94.1% ~ 104%. This method is simple, fast, sensitive, better selectivity and other characteristics, can be used directly in the determination of silicon in steel or water samples.