# Calculating PPM - (Dec/11/2012 )

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chandch on Tue Dec 11 20:12:44 2012 said:

For example, so my liquid is 0.897 g/cm3 is 0.897 g/ml. So I need 100 ppm. If I take 1.02 ml and put in 998.98 ml solvent which is 100 ppm. Am I right? or If I take 0.51 ml and 499.49 ml solvent, so it is 100 ppm. am I right?

If you take 1,02ml, you have= 1,02ml x 0,897 g/ml = 0,914 grams (its a bit less then 1, you need to recalculate it.. (I rounded the numbers))
I just noticed a mistake, you need 1 mgrams not 1gram!

So 1 gram is 1000 ppm more then 1mg.

So if you take 1 gram (1,02ml) and add this in 998,98ml , totaling 1 gram in 1000ml or 1gram in 1 liter, you have 1000ppm = 1000g/m3 = 1000mg/L (remember that: ppm = 1g/m3 = 1mg/L)

So to have 1000pm, you dont need 1 gram, but 0,1 gram.

I hope there are not mistakes this time.

But its pretty simple in the end:

1 ppm means 1 part per million, and you know that 1 ppm = 1g/m3 = 1mg/L (or 1ppm = 1mg/kg = 1μg/g)
So you should be able to figure it out yourself now.

-pito-

Thank you.

-chandch-

chandch on Wed Dec 12 08:31:47 2012 said:

Thank you.

Just make sure you understand the logic behind it.
There is no point in memorising formulas.

An re-calculate it, its possible I might an error somewhere.

-pito-

1mg/106 mg (PPM)

Does density of solutions needs consideration? some solutions have less volume/kg other higher.

-Inbox-

prabhubct on Wed Dec 12 19:08:30 2012 said:

1mg/106 mg (PPM)

Does density of solutions needs consideration? some solutions have less volume/kg other higher.

Yes it matters.

If you work with a solution and not a powder for example, it matters.

Its the "substance/powder" that matters, not the fluid in wich it is dissolved.

-pito-
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