Do the test values for ammonia nitrogen in wastewater include urea?
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As the title says. If the wastewater contains sulfuric acid an (with an equivalent ammonia nitrogen value of 1000 mg/L) as well as urea (which, if completely hydrolyzed, has an equivalent ammonia nitrogen value of 1000 mg/L), what will be the (total) ammonia nitrogen value measured by the environmental protection agency? Thank you!
Total nitrogen = total Kjeldahl nitrogen + nitrate nitrogen + nitrite nitrogen. Kjeldahl nitrogen refers to the nitrogen content determined by the Kjeldahl method. It includes ammonia nitrogen and organic nitrogen compounds that can be converted into ammonium salts under these conditions and thus measured. Such organic nitrogen compounds mainly include proteins, amino acids, peptides, peptones, nucleic acids, urea, as well as synthetic organic nitrogen compounds in which nitrogen is in a trivalent negative form; however, azide compounds and nitro compounds are not included. There are detailed explanations for this on Baidu. In my understanding, the sulfuric acid you mentioned falls under the category of ammonia nitrogen, while urea belongs to organic nitrogen. Therefore, the value calculated based on these two figures should represent Kjeldahl nitrogen, rather than total ammonia nitrogen, since you did not provide data on nitrite nitrogen and nitrate nitrogen. Personal understanding
What was said upstairs is correct; sulfuric acid ammonia belongs to the category of ammonia nitrogen, while urea counts as nitrate nitrogen, which cannot be detected within ammonia nitrogen. If total nitrogen is measured, then it will be shown.
What was said upstairs is all correct, but once urea passes through wastewater treatment facilities, hydrolysis generally occurs, which results in a high level of ammonia nitrogen.