Additional notes from Canadian government: CANADA Total Kjeldahl Nitrogen (TKN) – refers to a method used in the determination of nitrogen in its trinegative state including organic nitrogen plus ammonia nitrogen.
Limits:
Maine Maximum Exposure Guideline limit:
USA Primary Drinking Water Standard limit:
USA Secondary Drinking Water Standard limit:
Canada Health standard limit:
Canada Aesthetic standard limit:
USA daily recommended allowance:
Other standard:
Additional Resources: