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二安替比林甲烷(DAPM)法测定钛,虽灵敏度较高,但在矿物微量分析中由于称样量的减少或含量低时仍感灵敏度不够。我们发现:在氯化物和硫氰酸铵介质中,钛能与DAPM生成(DAPM)_2Ti(CNS)_8形式的三元络合物。该络合物具有疏水性和易萃性,籍氯仿萃取后直接光度法测定,可大大提高方法的灵敏度。络合物摩尔吸光系数达6×10~4,方法适宜于微克量钛的测定。
Diantipyrylmethane (DAPM) method for the determination of titanium, although the sensitivity is high, but in the mineral trace analysis due to the reduction of sample size or low sensitivity is still not enough. We found that titanium can form ternary complexes with DAPM in the chloride and ammonium thiocyanate media (DAPM) _2Ti (CNS) _8. The complex is hydrophobic and easy to extract, after chloroform extraction direct spectrophotometric determination can greatly improve the sensitivity of the method. Complex molar extinction coefficient of 6 × 10 ~ 4, the method suitable for the determination of trace titanium.