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I've heard that it is suggested that you should use the formula nx/x and px/x, where x is a unit, to represent ppb and ppt, and that the reason why the SI Brochure doesn't recognise ppb and ppt is because they are unitless quantities. If it is 5 parts per billion in reference to a liquid in a liquid, that should be written as 5 nl/l. The only exception would be kg which already contains a prefix, so 5 parts per billion in reference to a mass in a mass, that will instead be 5 µg/kg.
The text also glosses over "ppm" (parts per million), while not linguistically ambiguous as the other two, the same regarding the lack of unit applies here too, so 5 ppm in reference to a liquid in a liquid should be written as 5 µl/l instead. 2A01:5D0:8572:DF00:FDCF:3C3B:F0A4:A8DD (talk) 03:16, 15 May 2022 (UTC)