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So, a milligram is one ppm of a kilogram; therefore, one ppm is the same as one mil-ligram per kilogram. â¢ milligram/kilogram or â¢ mg/kg or â¢ 0.001/1,000 or â¢ 10-3/103 38 On Tap Fall 2004 What does ppm or ppb mean? What is ppm and what does it mean? Most contaminants are expressed as parts per million (ppm).This means
A weight to weight ratio used to describe concentrations. Parts per million (ppm) is the number of units of mass of a contaminant per million units of total mass. ppm (or ppmm) is used to measure the concentration of a contaminant in soils and sediments.