What is meant by ppm?where it is used?
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parts per million,it is unit for measuring
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Parts per million (ppm) is the number of units of mass of a contaminant per million units of total mass. Source: GreenFacts. More: ppm (or ppmm) is used to measure the concentration of a contaminant in soils and sediments. In that case 1 ppm equals 1 mg of substance per kg of solid (mg/kg).
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