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于0.2N HCl介质中,在氯化十四烷基二甲基苄基铵(Zeph)存在下,溴邻苯三酚红(BPR)可与Zr(Ⅳ)形成三元配合物,ε_(539nm)=3.7×10~4。我们发现在0.02N HCl介质中,溴化十六烷基三甲铵(CTAB)或溴化十六烷基吡啶(CPB)的存在可使Hf(Ⅳ)与BPR的显色反应的灵敏度提高5～6倍[Hf(Ⅳ)-BPR二元体系ε_(660nm)=1.2×10~4]。在此条件下,zr(Ⅳ)-BPR体系的灵敏度均低,且可被乳酸掩蔽,这对在锆的存在下测定铪很有利。是铪的灵敏显色反应之一。
Bromopyrogallol red (BPR) can form a ternary complex with Zr (Ⅳ) in the presence of tetradecyldimethylbenzylammonium chloride (0.2mol) in 0.2N HCl medium. Ε_ (539nm ) = 3.7 × 10 ~ 4. We found that the presence of cetyltrimethylammonium bromide (CTAB) or cetylpyridinium bromide (CPB) in 0.02N HCl can increase the sensitivity of Hf (Ⅳ) to the color reaction of BPR by 5 ~ 6 times [Hf (Ⅳ) -BPR binary system ε_ (660nm) = 1.2 × 10 ~ 4]. Under these conditions, the sensitivity of the zr (IV) -BPR system is low and can be masked by lactic acid, which is advantageous for the determination of hafnium in the presence of zirconium. Hafnium is one of the sensitive color reaction.