Conversion from mg/l to ppm 2

[pb2102sm]

Hi all,

I remember have seen/red that 1 mg/L = 1 ppm but I'm not sure that this is true for all cases. For example, there are salts that are completely soluble in water (NaCl), and other that are partially soluble or not soluble at all in water (AgCl, PbBr2). We also have the cases of dispersion such as oil in water.

Note: Let's assume that all the cases are at standard conditions.

Can anyone share their experience with this? if we can use that conversion in all of these cases?

Thank you,
pb2102sm

 

[SuperSalad]

More accurately, 1 mg/kg = 1 ppm. But 1 kg of water is equal to 1 L of water, which is why that convention is often used.

Regardless of dispersion or solubility, if you have the mass of one component in a solution, mixture, emulsion, etc. and you know the mass of the whole, you can figure out the ppm.

The simple way I used to keep it straight is to calculate the percent by weight and multiply that by 10,000 to get the ppm number.

- Andrew

 

[pierreick]

Hi,
ppm stands for part per million =1/1e6
then you have to consider which one ppm volume, ppm mole and ppm mass,
In industry more often we consider mass i.e. mg/kg
In the case of mg/l the assumption is that the density of the solvent is 1 kg/l .

Pierre

 

[pb2102sm]

pierreick and SuperSalad thanks for the inputs, I appreciate.