How do I convert results in parts per million to milligrams per kilogram (or vice versa)?
The two units are equivalent. A milligram (mg) is one-thousandth of a gram (g), which in turn is one-thousandth of a kilogram (kg). Therefore, a milligram is one one-millionth of a kilogram and 1 milligram per kilogram (mg/kg) equals 1 part per million parts, or 1 ppm. A similar relationship exists for aqueous samples because 1 liter of water weighs approximately 1 kilogram, if you ignore the small density differences between pure water and the majority of environmental samples. Thus, 1 mg/L is equivalent to 1 ppm. Similarly, 1 microgram per liter (ug/L) or 1 microgram per kilogram (ug/kg) is equivalent to 1 part per billion parts, or 1 ppb.
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