Summary
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1.
A new method has now been developed for the estimation of oxalic acid. The method consists in exposing a measured volume of the oxalic acid solution with a known excess of ceric sulphate solution to sunlight or to the light from a 1000 watt tungsten filament lamp for a short time (for 5 minutes to bright tropical sunlight and for 15 minutes under the light from a 1000 watt tungsten filament lamp). Then the excess of unreacted ceric sulphate is estimated by titration with standard Mohrs salt solution.
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The method is applicable even in the presence of formic acid. High concentrations of formic acid show a slight error (0.5 to 1.0 percent) in experiments with sunlight, while no error is introduced in the experiments with the light of a 1000 watt tungsten filament lamp.
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Gopala Rao, G., Aravamudan, G. Estimation of oxalic acid by photochemical oxidation with ceric sulphate. Z. Anal. Chem. 145, 426–430 (1955). https://doi.org/10.1007/BF00438044
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DOI: https://doi.org/10.1007/BF00438044