Question regarding the reduction of nitrate by chromium powder
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When I tested samples containing nitrate nitrogen and ammonium nitrogen, I used chromium powder since I didn’t have a nitrogen-determination alloy, and followed the old standards strictly – why couldn’t I get a result? After that, I used potassium nitrate as a sample for testing; the first result was only 0.8%. I suspected that the heating temperature wasn’t high enough or fast enough, so I replaced the electric heating mantle with an electric furnace, and this time the result was 8%. Finally, I asked for advice in a forum, where it was suggested that the sample should be boiled dry. After doing that, the result was again only 3%. What’s going on here? Also, what is the actual nature of this reaction? Nitrate nitrogen isn’t reduced to nitric oxide or anything like that, right? I’m seeking help from experts; it’s been bothering me for days. Thanks, if you think it’s troublesome, feel free to call me directly. 158 280 31 281 Thank you!
Do you know the chemical properties of chromium? A dense film forms on the surface of metallic chromium in air, and it remains unreactive unless hydrochloric acid is used as a medium (or, in some cases, dilute sulfuric acid, as I have tried).
Reply to 2# xxhsang: Thank you! I really didn’t know that! I bought the nitrogen-fixing alloy today to see if I can create something using it! Thank you so much for getting back to me!