ローダミンBによる軽合金中のスズのけい光定量

概要

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A method for determining 0.0020.1% of tin in light alloys (Al-base and Mg-base alloy) was investigated, and the following procedure was established. One gram of sample was dissolved with 40 ml of 4N hydrobromic acid and 12 drops of 30% H2O2. The solution was filtrated through a filter paper (No. 5A). The filter paper was then washed thoroughly with 4N hydrobromic acid, and the solution was diluted with 4N hydrobromic acid to 100.0 ml. A 0.510 ml portion of the solution was transferred to a 50 ml separating funnel, and tin was extracted into ethylether from the 4N HBr medium. The ether layer was transferred into 100 ml beaker, and evaporated gently. The residue was dissolved with 2 N hydrobromic acid and transferred into a separating funnel. To the solution, 1.5 ml of 0.5% Rhodamine B solution and 5 ml of benzene were added, and the whole was shaken for 1 minute. The fluorescence intensity of the benzene solution was then measured. These procedures took 45 minutes, and 0.0020.1% of tin in light alloys (Al-base and Mg-base alloy) could be determined.
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