Abstract
The amount of sulfuric acid in chromium plating solutions was determined by the use of a rapid and simple turbidimetric procedure for barium sulfate precipitated. Chromium (VI) oxide was reduced completely to chromium (III) with ethylalcohol before the turbidimetry. A wavelength of 700nm was used in the method, because the absorption of light by chromium (III) was less in this wavelength than in other wavelengths. The same sample solution containing no barium nitrate was used as the reference solution to eliminate interference with colored metal ions such as chromium (III), copper and nickel. The time required for the analysis was about 40 minutes for each sample. Analytical results for sulfuric acid in an actual chromium plating solution showed a very good agreement with the amount of the acid obtained by a gravimetric method.
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