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1 引言 草酸铁钾(K_3(C_2O_4)_3·3HO_2)作为一种理想的化学光量计,己广泛应用于光化学和光催化反应中量子收率的测定。但是由于它对紫外和短波可见光(250nm～500nm)十分敏感,难于在可见光下进行分析操作,所以一般在制备和使用过程中都不做纯度分析,因此文献中未报道它的分析方法。我们的工作表明,在暗室红光下用磷酸作为三价铁离子的掩蔽剂,以高锰酸钾溶液滴定草酸根离子,可得到满意的分析结果。
1 Introduction Potassium ferric oxalate (K_3 (C_2O_4) _3 · 3HO_2) has been widely used in the determination of quantum yield in photochemistry and photocatalysis as an ideal chemical light meter. However, since it is very sensitive to UV and shortwave visible light (250nm-500nm) and is difficult to analyze under visible light, its purity is not usually measured during preparation and use. Therefore, its analytical method is not reported in the literature. Our work shows that using phosphoric acid as a masking agent for ferric ions in darkroom red light and titrating oxalate ions with a potassium permanganate solution gives satisfactory analytical results.