3，5－二溴水杨基荧光酮（DBSF）易溶于乙醇，此试剂在强 酸性介质中与钛及阳离子表面活性剂形成红紫色三元络合物，λmax537 nm，ε＝1.70×105，二元络合物ε463.3＝4.2×103， 三元络合物比二元络合物灵敏度提高40倍。本文对Ti－DBSF－CT MAB三元络合物显色条件作了较详细的研究，用此法测定了合金钢中微量钛 ，获得较满意的结果。
3, 5-dibromo-salicylfluorone(DBSF) with titanium can form a binary complex in an acidic solution(H2SO4), its apparent molar absorpt ivity is 4.2×103L*cm-1*mol-1 at 463.8nm. In the presence of cetyltr imethyl ammonium bromide(CTMAB), this binary complex can form a ternary complex with apparent molar absorptivity ε537=1.70×105L*cm-1*m ol-1. The sensitiuity of the ternary comphex is 40 times higher than that of binary complex. The optimal condition for the color reaction of Ti( Ⅳ)-DBSF-CTMAB has been studied in detail. The complex can stabilize about five hours.Beer’s law is obeyed in the range 0-5.0μg/25mL for titanium, and correlation coefficient(r) is 0.9912. The method has been applied to determine trace Ti in steel with satisfactory results.
参考文献
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