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本文提出了一种简便而灵敏的测定水相中钛的分光光度法。在 PH1～7酸度范围内,钛离子与2,4—二羟基苯甲醛异烟酰腙(2,4—BHBINH)生成一种红棕色的络合物。该络合物有两个最大吸收,一个在波长430纳米处,另一个在波长500纳米处。PH1.5时,试剂在波长430纳米处有明显的的吸收,而在波长500纳米处的吸收则可忽略不计。钛(Ⅳ)含量在0.09～2.15微克/毫升范围内符合比耳定律。方法的摩尔吸光系数和桑德尔灵敏度分别为1.25×10~4升/摩尔·厘米和0.0049微克/厘米~2。本文还提出了用一阶导数分光光度测定钛的方法。方法已成功地用于一些合金样和钢样中钛的测定。
In this paper, a simple and sensitive spectrophotometric method for the determination of titanium in aqueous solution was proposed. Titanium ions form a reddish brown complex with 2,4-dihydroxybenzaldehyde isonicotinoyl hydrazone (2,4-BHBINH) at a PH1-7 acidity range. The complex has two maximum absorbances, one at 430 nm and the other at 500 nm. At pH 1.5, the reagents show significant absorption at 430 nm and negligible absorption at 500 nm. Beer’s law is obeyed for titanium (IV) in the range of 0.09-2.15 μg / ml. The molar absorptivity and Sander sensitivity of the method were 1.25 × 10 ~ 4 L / mol · cm and 0.0049 μg / cm ~ 2, respectively. This paper also proposed a method for the first-order derivative spectrophotometric determination of titanium. The method has been successfully applied to the determination of titanium in some alloyed and steel samples.