1.1 Commonly used concentration units
However, units expressed as parts per a number (e.g. parts per million, ppm) may still be encountered. The conversion of parts per number data to concentration units can be confusing. For this reason, a range of ... Parts per trillion ppt ng/kg or ng.kg-1 pg/g or pg.g ng/L or ng.L-1 pg/mL or pg.mL fg/μL or fg.μL-1
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