mg /m³ = µg/l. 1l = 1 dm³ = 1 kg = 10ˉ³m³. for PO4-P, total P, SiO3-Si, NO3-N, NO2-N, total N, H2S-S and NH3/NH4-N. Phosphorus (P) MW P = 30.973762 µg/l P
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