### Possible Answer

1 ppm is 1 mg per liter or 1000 ug per liter. uM is micromoles per liter. To convert from one to the other, you need to know the formula (or molecular) weight of the ... - read more

parts per billion (ppb) to multiply by parts/billion micrograms/liter. 1 parts/billion milligrams/liter. 0.001 parts/billion parts/million. 0.001 micromoles per liter ... - read more

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