Ammonia Nitrogen Calculator
Definition: Ammonia nitrogen is determined after preliminary distillation, with the collected ammonia titrated using standardized sulfuric acid. The result is expressed as mg/L as NH₃-N.
NH₃-N (mg/L) =
[(A − B) × N × 14,000] / V
A = H₂SO₄ used for sample (mL)
B = H₂SO₄ used for blank (mL)
N = actual normality of H₂SO₄
V = original sample volume (mL)
Method basis: Standard Methods for the Examination of Water and Wastewater, Method 4500-NH₃ C — Titrimetric Method, following preliminary distillation under 4500-NH₃ B.