在稀硫酸(cH2SO4) 0.04~0.06 mol·L-1介质和非离子型表面活性剂OP的存在下,邻氯苯基荧光酮(o-Cl-PF)与钛(Ⅳ)反应生成红紫色络合物,其吸收峰位于540 nm波长处,在此波长条件下,测得其表观摩尔吸光率为1.66×105L·mol-1·cm-1.钛(Ⅳ)的质量浓度在(0~3 μg)/25 mL范围内显色体系遵守比耳定律.铁(Ⅲ)及钼(Ⅵ)的干扰借加入盐酸羟胺并在沸水浴中加热15 min可消除.应用此方法分析了轴承钢标准样品(G20Cr2NiMo,含钛wTi=0.004 0%),测定值与标准值相符,并求得其RSD(n=6)为6.1%.

In dilute H2SO4 medium cH2SO4 0.04-0.06 mol·L-1 and in the presence of OP,o-chlorophenylfluorone (o-Cl-PF) reacts with Ti(Ⅳ) to form a reddish violet complex with its absorption maxima at 540 nm and its value of apparent molar absorptivity of 1.66×105L·mol-1·cm-1.Beer′s law is obeyed in the range of 0-3 μg per 25 mL of the test solution.Interferences of Fe(Ⅲ) and Mo(Ⅵ) was eliminated by heating with hydroxylamine hydrochloride in boiling water for 15 min.The proposed method has been used in determination of titanium in a known sample of bearing steel (G20Cr2NiMo,wTi=0.004 0%),giving results in conformity with the known value with RSD′s (n=6) of 6.1%.