What reaction occurs when sulfuric acid an is mixed with superphosphate, resulting in an unpleasant odor?
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Recently, a batch of sulfuric acid AN, which is a by-product of ammonia production plants, was purchased and mixed with superphosphate; this mixture emitted an unpleasant odor, similar to that of sulfur dioxide. All the test results for sulfuric acid AN were satisfactory. Could someone please advise me on what might be causing this situation?
What is the production process associated with the original indicator, and what is the current production process for the by-products? A comparative analysis should yield results
It might be sulfur dioxide. Superphosphate contains residual phosphoric acid, and the ammonium phosphate produced as a by-product is of poor quality, containing unoxidized sulfurous acid; when mixed, sulfurous acid is formed, which decomposes to produce sulfur dioxide