1964 Volume 37 Issue 12 Pages 1733-1735
Well-defined cathodic and anodic polarograms of stannous tin in sodium formate have been reported. The diffusion current is directly proportional to the concentration of stannous tin between 10−5 to 10−4M. The anodic half-wave potential of tin is shifted to positive values with the increase in the concentration of Sn2+, whereas the cathodic half-wave potential is constant. The anodic polarogram is highly irreversible. The cathodic polarogram is also irreversible. The irreversibility of the anodic polarogram is increased with the concentration of stannous formate. This is evidenced by a corresponding increase in the difference between E3⁄4 and E1⁄4. Above pH 5.0 the anodic polarogram merges with the cathodic polarogram,. thereby limiting the polarographic determination of Sn2+ to the pH value 3∼5. The E1⁄2 of the anodic polarogram shifts to negative potentials when the pH was increased, whereas that of the cathodic wave is constant. The polarogram with equal wave heights obtained in 1 molar sodium formate at pH 3.0 with 0.005% gelatin has been taken for the determination of tin.
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