2006•Metallurgical AnalysisRequires access

Spectrophotometric determination of micro titanium in steels with system of Ti(IV)-mannitol-pyrogallol red-cetyltrimethyl ammonium bromate

Qiu Hui-dong

Abstract

In the presence of cetyltrimethyl ammonium bromate(CTMAB),Ti(Ⅳ)can form a blue complex with mannitol and pyrogallol red(PR)at pH 3.4.A ratio of Ti(Ⅳ)∶mannitol∶PR∶CTMAB is determined to be 1∶1∶2∶3 by continous isomolar changes.The complex exhibits a maximum absorption at 630 nm,Beer's law is obeyed in the range of 0-35 μg Ti(Ⅳ)per 25 mL solution.The apparent molar absorptivity is 3.1×105 L·mol-1·cm-1.By using ascorbic acid for masking Fe(Ⅲ),the system may be applied to the determination of titanium in steels without previous separation.

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Key concepts: Molar absorptivity, Bromate, Chemistry, Mannitol, Pyrogallol, Nuclear chemistry, Ascorbic acid, Ammonium