Units
commonly used to express contamination ratios, as in establishing the
maximum permissible amount of a contaminant in water or soil. In soil:
ppm = milligrams of contaminant to one kilogram of soil, ppb =
micrograms of contaminant per kilogram of soil. In water: ppm = for
water is milligrams of contaminant per liter of water, ppb = micrograms
of contaminant per liter of water.
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