Unit conversion

Unit Conversion

Equivalences

(for PO4-P, P, SiO3-Si, N03-N, NO2-N, NH4-N, N, H2S-S)

μmol/l = μg-at/l = mmol/m3 = μM
mg/m3 = μg/l
1 l = 1 dm3 = 10-3m3 ≈ 1.025 kg

Conversions

μg/l = μmol/l × MW
g/l ≈ g/kg × 1.025

Phosphate Phosphorus (PO4-P)

MW PO4 = 94.971482
MW P = 30.973762

1 μg PO4/l = 1/MW PO4 μg = 0.010529 μmol PO4/l
1 μg PO4/l = MW P/MW PO4 = 0.326138 μg P/l
1 μg P/l = 1/MW P = 0.032285 μmol P/l

Nitrate Nitrogen (NO3-N)

MW NO3 = 62.005010
MW N = 14.006720

1 μg NO3/l = 1/ MW NO3 μg/l = 0.016128 μmol NO3/l
1 μg NO3/l = MW N/MW NO3 = 0.225897 μg N/l
1 μg N/l = 1/MW N = 0.071394 μmol N/l

Nitrite Nitrogen (NO2-N)

MW NO2 = 46.005580
MW N = 14.006720

1 μg NO2/l = 1/ MW NO2 = 0.021736 μmol/l
1 μg NO2/l = MW N/MW NO2 = 0.304457 μg/l N
1 μg N/l = 1/MW N = 0.071394 μmol N/l

Ammonium Nitrogen (NH4-N)

MW NH4 = 18.038508
MW N = 14.006720

1 μg NH4/l = 1/ MW NH4 = 0.055437 μmol NH4/l
1 μg NH4/l = MW N/MW NH4 = 0.776490 μg N/l
1 μg N/l = 1/MW N = 0.071394 μmol N/l

Silicate Silicon (SiO3-Si)

MW SiO3 = 76.083820
MW Si = 28.085530

1 μg SiO3/l = 1/ MW SiO3 = 0.013143 μmol SiO3/l
1 μg SiO3/l = MW Si/MW SiO3 = 0.369139 μg Si/l
1 μg Si/l = 1/MW Si = 0.035606 μmol Si/l

Hydrogen Sulphide Sulphur (H2S-S)

MW H2S = 34.080894
MW S = 32.065000

1 μg H2S/l = 1/ MW H2S = 0.029342 μmol H2S/l
1 μg H2S/l = MW S/MW H2S = 0.940850 μg S/l
1 μg S/l = 1/MW S = 0.031187 μmol S/l

Oxygen (O2)

Molar volume at STP = 22.391 l
Molar weight of oxygen = 31.998 g
Atomic Mass of oxygen = 15.994 g/mol

1 μmol O2 = .022391 ml
1 ml/l = 103/22.391 = 44.661 μmol/l
1 mg/l = 22.391 ml/31.998 = 0.700 ml/l
1 mg-at/l = 15.994x22.391/31.998 = 11.192 ml