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文献已先后报导了钛铁试剂光度法同时测定铁和钛的方法。Ⅱ.n.IIiepOoB等根据铁,钛的磺基水杨酸(Ssal)络合物的光谱特征,提出在对钛无吸收的500nm下测定铁,而在对钛有较大吸收的370nm下测定铁钛合量。此法借助于pH5.1时生成[Fe(Ssal)_2]~(3-)络合物测定铁(我们验证pH为4.7)。其缺点是pH无平台区,测定铁的灵敏度不高,[fe(Ssal)_2]~(3-)在370nm吸收较大,影响测定钛的精密度。 本文采用pH3.2借生成[Fe(Ssal)]°测定铁。此时铁的灵敏度有所提高,而对钛的灵敏度没有影响。此外测铁的pH有一平台范围,易于调节和控制。由于降低pH,提高了二者分析的选择性。
The literature has reported on the method of simultaneous determination of iron and titanium by the ilmenite reagent spectrophotometry. II.n. IliepOoB According to the spectroscopic characteristics of iron and titanium sulfosalicylic acid (Ssal) complexes, it is proposed that iron is measured at 500 nm without absorption of titanium and at 370 nm with greater absorption of titanium Titanium total amount. This method determines iron with the aid of a [Fe (Ssal) _2] ~ (3-) complex at pH 5.1 (we verify that the pH is 4.7). The disadvantage is that pH has no plateau region and the sensitivity of iron is not high. The absorption of [fe (Ssal) _2] ~ (3-) at 370nm greatly affects the determination of titanium precision. In this paper, pH [3.2] was used to generate iron [Fe (Ssal)] °. At this point the sensitivity of iron has increased, while the sensitivity of titanium has no effect. In addition the pH of the iron has a platform range, easy to adjust and control. As the pH is lowered, the selectivity of the two assays is increased.