二安替比林甲烷分光光度法测定铝合金中钛

Spectrophotometric determination of titanium in aluminium alloy with diantipyrylmethane

介绍了采用二安替比林甲烷光度法直接测定铝合金中钛含量的方法。试样经硝酸-氢氟酸快速分解，以硼酸中和过量氢氟酸，在1．2mol／L盐酸-1．8mol／L硫酸介质中显色，溶液中大量共存离子均不干扰测定。钛含量在0．40～10．0μg／mL范围内符合比尔定律，线性回归方程为A=0．0106＋0．365p（μg／25mL），r=0．9996。方法用于铝合金标准样品中钛的测定，结果与认定值吻合，相对标准偏差为2．5％～5．0％。

A method for the determination of titanium in aluminium alloy by diantipyrylmethane （DAPM） spectrophotometry was introduced. The sample was rapidly decomposed by HNO3 -HF, and the excessive HF was neutralized by H3BO3. The color reaction occured in the medium of 1.2 mol/ L HCl-1.8 mol/L H2SO4, and the coexisting ions did not interfere in the determination. Beer＇s law was obeyed in the range of 0.40-10.0 μg/mL for Ti（Ⅳ）, and the linear regression equation is A=0. 010 6＋0. 365 p（μg/25 mL） ,the correlation coefficent is 0. 999 6. The proposed method was applied to the determination of Ti in aluminium alloy standard samples with the relative standard deviation of 2.5 %- 5.0%. The results are consistent with the certified values.