determination of titanium (iv) in tap water and ore samples with kinetic - spectrophotometric method

a simple, selective and sensitive method for the determination of trace amount of titanium (iv) based on its catalytic effect on methylene blue- ascorbic acid redox reaction has been reported. the reaction was followed spectrophotometrically by measuring the change in absorbance of methylene blue at 665 nm, 5 minutes after the initiation of the reaction. in this study experimental parameters were optimized and the effect of other cations and anions on the determination of titanium (iv) was examined. the calibration graph was linear in the range of 3–25 ng ml–1 of titanium (iv). the relative standard deviation for the determination of 10 and 20 ng ml –1 of titanium (iv) were 2.64% and 1.51% respectively (n=8). the detection limit calculated from three times of standard deviation of blank 3sb was 0.6 ng ml–1. the method was successfully applied to the determination of titanium (iv) in tap water and ore samples.