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在氯乙酸介质中,在 Tween 80和溴化十六烷基三甲基铵(CTAB)参与下,Ti(IV)与溴邻苯三酚红(BPR)形成两种络合物,BPR过量时为红紫色络合物(λ_(max)=527nm);Ti(Ⅳ)过量时为兰色络合物(λ_(max)=650nm)。本文系统研究红紫色络合物的形成条件。试验表明,此类络合物具有极高的灵敏度(ε_(527nm)=2.5×10~6I·mol~(-1)·cm~(-1))但选挥性较差。反应的适宜酸度为pH2.40—2.91。络合物中Ti(Ⅳ)与BPR的摩尔比为2:5。钛含量在2—12ng/ml范围遵守比尔定律。研究了30多种离子的干扰。讨论了反应灵敏度提高的原因。
In chloroacetic acid medium, Ti (IV) forms two complexes with bromopyrogallol red (BPR) with the participation of Tween 80 and CTAB. When BPR is excess (Λ max (max) = 527 nm); blue complex (λ max (max) = 650 nm) when Ti (Ⅳ) is excessive. This article systematically studied the formation conditions of magenta complex. Experiments show that these complexes have very high sensitivity (ε 527 nm = 2.5 × 10 6 I · mol -1 cm -1) but less selective. The suitable acidity for the reaction is pH 2.40-2.91. The molar ratio of Ti (Ⅳ) to BPR in the complex is 2: 5. The Ti content obeys Bill’s law in the range of 2-12 ng / ml. Studied the interference of more than 30 kinds of ions. The reason why the reaction sensitivity is improved is discussed.