Wastewater New York State Exam 2025 – 400 Free Practice Questions to Pass the Exam

Kjeldahl nitrogen is primarily a method used to determine the total nitrogen content in organic compounds and ammonia nitrogen. This process involves digesting the sample in a concentrated acid, which converts all forms of organic nitrogen into ammonia. The ammonia is then quantified, allowing for the calculation of both organic nitrogen and ammonium nitrogen in the sample.

This method does not measure nitrate or nitrite directly, as the digestion step is designed to convert all nitrogen into a form that can be measured, primarily emphasizing the organic and ammonia components. Therefore, the focus on organic nitrogen and ammonia nitrogen makes this choice the most appropriate in the context of what Kjeldahl nitrogen encompasses.