The Determination of Tin in Tin Metal and in Zircaloy by Precise Coulometric Titration

• Published in: Bulletin of the Chemical Society of Japan Vol. 44; no. 3; pp. 734 - 737
• Main Authors: Yoshimori, Takayoshi, Matsubara, Ikuko, Tanaka, Tatsuhiko, Yoshida, Kazuo, Tanaka, Kazuo, Tanabe, Toyokazu
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.01.1971; Chemical Society of Japan
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.44.734

The purities of tin metals are determined directly by precise coulometric titration. The sample is dissolved with hydrochloric acid in a nitrogen atmosphere. The solution is then introduced into a hot antimony column. The reduced tin(II) ions are titrated with electrolytically-generated iodine. The titration is accomplished in a special cell by the use of which any disturbance of atmospheric oxygen is avoided. The titration efficiency under these acidic media was decreased when the current density was increased more than several mA/cm2. The results obtained by two different analysts for the sample of the pure tin metal (5-nine) were 99.996 and 99.991%. The standard deviations of the results were 0.025 and 0.016% respectively. The tin in the other tin metals and in Zircaloy samples was determined satisfactorily without the use of any experimental factor.