Transcription of A2. Nitrogen in Waters: Forms and Concerns
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A2. Nitrogen in Waters: Forms and Concerns
Nitrogen in Minnesota Surface Waters June 2013 Minnesota Pollution Control Agency A2-1 A2. Nitrogen in Waters: Forms and Concerns Author: Dave Wall, MPCA Assistance from: Angela Preimesberger (MPCA) and Hillary Carpenter (MDH) on human health and drinking water; Steve Heiskary (MPCA) on lake eutrophication; and Greg Pratt (MPCA) on atmospheric issues Introduction Nitrogen (N) is one of the most widely distributed elements in nature and is present virtually everywhere on the earth s crust in one or more of its many chemical Forms . Nitrate (NO3), a mobile form of N, is commonly found in ground and surface waters throughout the country. Nitrate is generally the dominant form of N where total N levels are elevated.
Kjeldahl nitrogen (TKN), which measures a combination of organic N and ammonia+ammonium. Since N can transform from one form to another, it is often considered in its totality as total nitrogen (TN). This report most often refers to TN, but also at times focuses more specifically on the dominant form nitrate -N.
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