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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
does 1 mg/kg = 1 ppm NOT ALWAYS!!!! If you have 100 boxes of equal volume then 1 box = 1pph (part per hundred). If the overall mass of those hundred boxes is 100kg then 1 box or 1pph will have a mass of 1kg. Now, what if 99 boxes are full of feathers and 1 box is full of lead. If the mass of the 100 boxes is still 100kg then no matter which box you choose it will NOT have a mass of 1kg. Therefore for heterogeneous mixtures, 1ppm does not = 1mg/kg. The 1 ppm = 1mg/kg is simply a concentration measurement. This is done after the volume has been converted to mass. Sure you could have 99 boxes of feathers and one box of lead, that concentration of lead would be higher than 1 pph, because the mass of feathers would be low.