Coal Geology

Various concentration units used in ground water geochemistry:
– Molality: moles of solute per kilogram of solvent
– Molarity: moles of solute per liter of solution

• Molarity = Molality for dilute solutions. Not valid for brines.

– ppm: parts per million
- ppb: parts per billion
– Conc. in ppm = Conc. in mmol/kg x formula weight
Note: 1 ppm = 1 g / 10^6 g = 1 mg/kg = 1 mg/l (in most cases for dilute solution)

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