Abstract
After the comparisons of various procedures and conditions for reaction in the quantitative determination of tin, by application of reducing action of Sn (II) for formation of molybdenum blue, the hitherto known method has been improved with the most suitable conditions.
The development of blue coloration was indicated in Fig. 1, the change of the concentrations of potassium dihydrogen phosphate and ammonium molybdate with a fixed concentration of sulfuric acid at 3.6N. Also, the development of coloration with different concentrations of sulfuric acid was indicated in Fig. 2.
It was found that the suitable concentrations of reagents for development of coloration were 3.6N for sulfuric acid, 0.4% for potassium dihydrogen phosphate and 0.4% for ammonium molybdate.
The coloration was reproducible provided the concentration of tin was within the range of 015ppm. The reduction of tin was suitably made by using metallic alminum of ca. 99.8% purity.
