A unit of measurement that expresses a concentration that is the mass (weight) of one material dissolved into a volume of another material. A milligram is a metric unit of mass equal to 0.0000022 pounds or 1000 micrograms. A liter is a metric unit of volume approximately equivalent to 1 quart. Also, 1 mg/L is equivalent to 1 part per million (ppm).
MILLIGRAMS PER LITER (MG/L)
