Simultaneous determination of iron and titanium in silicate rocks by using diantipyrinylmethane with dual-wavelength spectrophotometry
✍ Scribed by Chan-Huan Chung
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 450 KB
- Volume
- 154
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The simultaneous determination of iron(II1) and titanium(IV) with diantipyrinylmethane (DAPM) based on dual-wavelength spectrophotometry is described. The absorbantes at 388 nm, 470, and 514. 9 (A,,,, A,,,, andA,,,.,, respectively) are measured and a ratio k (= A388/A514.9 ) of 3.64 is introduced to allow simultaneous determinations of iron and titanium. The apparent molar absorptivities obtained by using the differences in absorbance, A388-A514.9, for titanium and A.,,,, X k -A,,, for iron, are 1.41 X lo4 and 1.13 X lo4 1 mol-' cm-', respectively. The calibration graphs are linear up to 20 mg 1-r iron(II1) oxide and 5 mg 1-l titanium(IV) oxide. The proposed method was applied successfully to the determination of iron and titanium in silicate rocks. The protonation equilibria of DAPM were also studied; K,, and K,, are estimated as 10""' and 10'.'", respectively.