Determination of titanium (IV) in human enamel. II Solvent extraction and atomic absorption spectrophotometry.:II. Solvent Extraction and Atomic Absorption Spectrophotometry

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• A simple method for the determination of titanium (IV) in human enamel powder after treatment with (NH<SUB>4</SUB>) <SUB>2</SUB>TiF<SUB>6</SUB> solution was studied by atomic absorption spectrophotometry. Coexisting ions such as calcium, phosphate, magnesium, potassium and sodium in aqueous samples caused some interference, but the influence could be suppressed by the extraction of titanium (IV) -cupferron chelate compound into methyl isobutyl ketone (MIBK). The procedure was as follows. Samples (about 25-35 mg containing less than 120 μg of Ti (IV)) were decomposed with 3m<I>l</I> of 6N HCl and then the sample solution was diluted with 12m<I>l</I> of water. After 15m<I>l</I> of 1.2N HC1 and 1m<I>l</I>l of 0.25M cupferron solution have been pipetted into a 25 m<I>l</I> calibrated flask and mixed, 5m<I>l</I> of sample solution or Ti (IV) standard solution was added. The mixture had to be kept cool in an ice bath, because of the quick decomposition of cupferron chelate complexes. The mixture was diluted with 1.2N HC1 and mixed. After the solution was transferred into a separatory funnel, it was shaken with 10m<I>l</I> of MIBK for 5 minutes.<BR>Absorbance of Ti (IV) in the organic phase was measured with nitrous oxide-acetylene flame. Ti (IV) -cupferron chelate could be extracted quantitatively from 1.15N HC1 and 1.0×10<SUP>-2</SUP> M cupferron solution. The calibration curve was straight in the range 1.0-8.0μg/m<I>l</I> of Ti (IV). Relative standard deviation was 4.8%. Analytical results agreed closely with those obtained by extractionspectrophotometry using cupferron reagent, but extraction-spectrophotometry was not applicable because the chelate compound was unstable. The proposed method can be used for the determination of Ti (IV) in human enamel.

• 有限責任中間法人 日本口腔衛生学会の論文

有限責任中間法人 日本口腔衛生学会 | 論文

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