Abstract
Trace amounts of Fe, Cu and Ni in titanium alloy were quantitatively coprecipitated with indium hydroxide after masking titanium. A 200 mg amount of the sample was dissolved in hydrochloric acid. Before the coprecipitation procedure, the resulting titanium ions were masked with hydrogen peroxide to form its peroxo-complex. At least 3 cm3 of hydrogen peroxide was required for masking the titanium ions. Indium (11 mg) was added and the pH was adjusted to 9.0 using sodium hydroxide. Recovery of trace elements were optimum at pH 9.0. The precipitate was obtained by using a membrane filter system. The membrane filter was pressed between polyethylene phthalate film. It was then dried and measured directly by XRF. Detection limits were as follows: Fe 8.1 μg/g, Cu 0.8 μg/g, and Ni 1.4 μg/g in titanium alloy.
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