Analysis method for sulfur-phosphorus-nitric acid ternary mixture
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Analytical method for sulfur-phosphorus-nitric acid triacid mixture: How to analyze a solution that contains sulfur, phosphorus, and nitric acid? Are there any friends who use triacid as a raw material for organic synthesis? Please give your advice
The plan I have in mind is as follows: 1. Determine the total acidity. 2. Evaporate the solution to decompose as much nitric acid as possible. 3. Find suitable indicators to determine sulfuric acid and phosphoric acid separately (using methyl red as an indicator for the first equivalence point, and phenolphthalein as an indicator for the second equivalence point). 4. Calculate the amounts of sulfuric acid and phosphoric acid separately. 5. The amount of nitric acid is then determined by subtracting the amount of sulfonic acid from the total acidity. I would like to ask if there are any users who also use these three mixed acids, and whether there are any better analysis methods. This post was last edited by lifanwang on 2009-3-5 at 17:05
First, dilute and analyze P and S using ICP or atomic absorption, then titrate to determine the total acid. Can you come out?
By using non-aqueous titration, sulfuric acid and nitric acid should be able to be titrated step by step. There is relevant content in the Wuhan University version of \"Analytical Chemistry\".