Determination of acid mist in sulfuric acid exhaust gases
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The barium chromate method is used to determine sulfuric acid exhaust gases, with the main reaction formula being: SO42- + BaCrO4 → BaSO4↓ + CrO42-. However, SO2 in exhaust gases may also react with barium ions to form barium sulfite, which precipitates under alkaline conditions. As a result, SO2 interferes with the detection of acid mist, causing the measured values to be higher than the actual values? Which expert can explain this?
Hasn’t anyone encountered this problem? Is it because the acid mist absorbed using the ammonia method meets the required standards, or is it that there is less pressure to comply with environmental regulations so that the environmental authorities aren’t paying attention to it? Zhejiang has extremely strict environmental regulations; it’s really overwhelming!
The iodometric method is used to measure the SO2 captured by cotton balls in acid mist, and this value is deducted from the total sulfur content.
The only methods for measuring acid mist are ion chromatography and barium chromate method. It seems that the emission standards for pollutants in the sulfuric acid industry recommend the use of ion chromatography alone.