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在阳离子表面活性剂存在下,用苯基荧光酮类作显色剂测定微量钛已有报道,如钛—邻硝基苯基荧光酮—CTMAB,钛水杨基荧光酮—CTMAB,钛-苯基荧光酮—阳离子表面活性剂;用非离子表面活性剂作为增溶、增敏剂的有:钛—5—溴—水杨基荧光酮—Tween 20,钛—水杨基荧光酮—Triton X—100,钛—苯基荧光酮—Triton X—305—OP,钛—邻硝基苯基荧光酮—Tween 80。在此,我们试验了7种非离子表面活性剂和3种非一阳离子混合型表面活性剂对钛—o—NPF显色反应的影响。试验结果发现,用非离子表面活性剂体系的表观摩尔吸光系数比混合型表面活性剂体系的高。其中Ti-o-NPF-Brij-35体系的表观摩尔吸光系数为ε541nm=1.96×10~5 L·mol~(-i)·cm~(-1),配合物可稳定20h以上,配合物的组成为Ti:o—NPF=1:4。大部分常见金属阳离子对测定无干扰,用抗坏血酸作掩蔽剂能消除Fe(Ⅲ)的干扰,可直接测定某些合金钢样中的微量钛。
In the presence of cationic surfactants, the determination of trace titanium with phenylfluorone as a chromogenic reagent has been reported, such as titanium-o-nitrophenylfluorone-CTMAB, titanium salicylfluorone-CTMAB, titanium-benzene Fluorescent Ketone-Cationic Surfactants; Non-ionic surfactants as solubilizers and sensitizers are titanium-5-bromo-salicylfluorone-Tween 20, titanium-salicylfluorone-Triton X -100, titanium-phenylfluorone-Triton X-305-OP, titanium-o-nitrophenylfluorone-Tween 80. Here, we tested the effects of seven nonionic surfactants and three non-cationic mixed surfactants on the color reaction of titanium-o-NPF. As a result of the experiment, it was found that the apparent molar absorptivity of the nonionic surfactant system is higher than that of the mixed surfactant system. The apparent molar absorptivity of Ti-o-NPF-Brij-35 system is ε541nm = 1.96 × 10 ~ 5 L · mol ~ (-i) · cm ~ The composition is Ti: o-NPF = 1: 4. Most of the common metal cations do not interfere with the determination. Using ascorbic acid as a masking agent can eliminate the interference of Fe (Ⅲ) and directly measure the trace titanium in some alloy steel samples.