View all text of Part 116 [§ 116.1 - § 116.4]
§ 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]