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ppm = mg/L, mg/Kg, ug/mL, uL/L
ppb= µg/L, µg/Kg
1 ppb = 0.001 ppm
1 ppm = 1000 ppb
20000 µg/L = 20 mg/L
0.002 mg/Kg = 2 µg/Kg
ppm=parts per million
ppb=parts per billion
mg/L=milligrams per liter
mg/Kg=milligrams per kilogram
µg/L=micrograms per liter
µg/Kg=micrograms per kilogram
µg/mL=micrograms per milliliter
µL/L=microliters per liter