conversion of PPM to Grams

Questions and answers on how to convert things from one unit or system to another


conversion of PPM to Grams

Postby adesh_barde » Wed Jun 08, 2005 6:29 pm

How to convert PPM to grams in food industry

Postby Guest » Wed Jun 08, 2005 9:14 pm

They can't be directly converted. Ppm literally means parts of one thing per million parts of something else, and represents a dilute mixture. It can be specified on the basis of weights, volumes, mole fractions, so you have to know what kind of ppm is being discussed.

If it is by weight, then it is pretty simple. 1 ppm is also 1 microgram of something per gram of mixture, or 1 mg/kg, or 1 g/t. Just multiple by the amount of mixture.

Because of possible confusion, ppm is deprecated by both NIST and ISO. Forms that directly show the units, such as ug/g, umol/mol, uL/L, etc are preferred.

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