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# Unit conversions

​​​​​How to convert between different units

​​Equivalences and general conversions

µmol/l = µg-at/l = mmol/m³ = µM

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

1 µg P/l = 1/MW P = 0.032285 µmol/l

Phosphate Phosphorus (PO4-P)

MW PO4 = 94.971482 µg/l

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

Nitrogen (N)

MW N = 14.006720 µg/l N

1 µg N/l = 1/MW N = 0.071394 µmol/l

Nitrate Nitrogen (NO3-N)

MW NO3 = 62.005010 µg/l

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

Nitrite Nitrogen (NO2-N)

MW NO2 = 46.005580 µg/l

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

Ammonium Nitrogen (NH4-N)

MW NH4 = 18.038508 µg/l

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

Silicate Silicon (SiO3-Si)

MW SiO3 = 76.083820 µg/l
MW Si = 28.085530 µg/l

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

Hydrogen Sulphide Sulphur (H2S-S)

MW H2S = 34.080894 µg/l
MW S = 32.065000 µg/l

1 µg/l H2S = 1/ MW H2S µg/l = 0.029342 µmol/l
1 µg/l H2S = MW S/MW H2S = 0.940850 µg/l S
1 µg S/l = 1/MW S = 0.031187 µmol/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= 0.022391 ml
1 ml/l = 10​00/22.391 = 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 Print it Send to   Share it

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