Barium Chromate Method to Detect Sulfate in Water

2021-12-15

Sulfate in water is a common substance, which is widely present in various natural water bodies. It is mainly formed through the slow penetration of formation minerals into the groundwater. Therefore, the concentration of sulfate in the water quality of different environments is different. Before, we introduced the gravimetric method to detect sulfate in water, but this type of method is suitable for boiler water, industrial cold circulating water, and other water samples with a content of less than 10mg/L. To detect sulfate in natural water samples such as river water and lake water, we can use the Barium Chromate photometric method.

The principle is that in an acid solution, barium chromate and sulfate form barium sulfate precipitation and release Chromate ions. After the solution is neutralized, the excess barium chromate and the generated barium sulfate are still in a precipitated state, and the precipitate is removed by filtration. Under alkaline conditions, the chromate ion appears yellow, and the content of sulfate can be known by measuring its absorbance.

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Barium Chromate

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