[jigga^2]

Hi everyone, I have what I think is a simple question but I don't want to get confused...

I have obtained data from ion chromatography which gives me phosphate anion concentration in mM. I want to convert this to mg/l, is it as simple as mM =  mmol/L = x MW mg/L?

Furthermore, at what point does one take dilution factors into account. The samples were diluted 10x. Example data is 0.2955 and 0.3062 mM.

[Borek]

gives me phosphate anion concentration in mM. I want to convert this to mg/l, is it as simple as mM =  mmol/L = x MW mg/L?

Yes.

Furthermore, at what point does one take dilution factors into account. The samples were diluted 10x. Example data is 0.2955 and 0.3062 mM.

Doesn't matter when you divide by ten.

[jigga^2]

Thanks very much

gives me phosphate anion concentration in mM. I want to convert this to mg/l, is it as simple as mM =  mmol/L = x MW mg/L?

Doesn't matter when you divide by ten.

Divide by 10?

I had 5ml sample and 45ml ultrapure water, giving a dilution factor 10, so say

0.5209 mM = 0.5209 mmol/l = 0.5209*94.9714 = 49.47 mg/l, then divide by 10 to take into account the factor?

[Borek]

Sorry, brain fart. Division is to calculate concentration after dilution, that's not what you are interested in, you won't it the other way around - you are interested in initial concentration, so you have to multiply by 10.

Doesn't matter if you multiple concentration expressed in mol/L (before conversion to mg/L) or mg/L - final result is the same.