Concentration
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- Amount of a chemical in a particular volume or weight of air, water, soil, or other medium. See parts per billion, parts per million.
EPA - Cite This Source - This Definition - Amount of a chemical in a particular volume or weight of air, water, soil, or other medium. See parts per billion, parts per million. See parts per billion, parts per million.
EPA - Cite This Source - This Definition - calcium carbonate (CaCO\<sub\>3\</sub\>), Carbon Cycle, Carbon pool, Soil Carbon