Based on the color reaction with titanium(IV), a simple spectrophotometric method for the determination of 10
-5 mol dm
-3 levels of DFB was developed. The recommended procedure was carried out as follows: an aliquot of a sample solution (15 cm
3) containing less than 4.4 mg of Desferrioxamine B mesylate was taken into a 25 cm
3 volumetric flask, and 4 cm
3 of a 1 mol dm
-3 hydrochloric acid solution and 5 cm
3 of a 1 × 10
-3 mol dm
-3 titanium(IV) solution were added and the mixture was diluted to the mark with water. After 5 min, the absorbance at 356 nm was measured against water. The calibration curve was linear over the DFB concentration range 2× 10
-5-2 ×10
-4 mol dm
-3. The relative standard deviation was 0.65% for, [DFB]
T=1× 10
-4 mol dm
-3 (12 determinations). The detection limit was 1.31 × 10
-6 mol dm
-3 (
S/
N= 2). For the determination of 4× 10
-5 mol dm
-3 DFB, diverse ions were tolerated up to 1000-fold molar excess of NO
3-, Cl
-, Cl0
4-, SO
42-, K(I) and Na(I); they were tolerated up to a 100-fold molar excess of EDTA, glycine, Al(III), Co(II), Cu(II), Pb(II) and Zn(II), respectively. For the determination of 4 ×10
-5 mol dm
-3 DFB, equal amounts of Fe(III), V(V) and Mo(VI) interfered; however, a 50-fold molar excess of Fe(III) was tolerated with the use of [HNO
3]
T = 1.5 mol dm
-3 instead of [HCl]
T= 0.16 mol dm
-3.
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