U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 11, 2022

§ 116.2 - Abbreviations.
ppm = parts per million mg = milligram(s) kg = kilogram(s) mg/l = milligrams(s) per liter= (approx.) ppm mg/kg = milligram(s) per kilogram= (approx.) ppm [43 FR 10474, Mar. 13, 1978]