Calculating PPM - (Dec/11/2012 )

Hi all
I am trying to calculate 1 ppm, 100 pmm for cis-3- hexenyl acetate solution (98%). FW is 142.2 and density is 0.897. Can anybody help me how to calculate ppm.

Thank you

chandch on Tue Dec 11 18:33:40 2012 said:

Do you know what ppm means?

and you mean 100ppm right, not 100pmm?

Hi
It's parts per million. Could you please help me how I calculate ppm's

chandch on Tue Dec 11 18:37:08 2012 said:

well, if you know what it means,then why cant you calculate it?

100 ppm means 100 parts per million , so 100parts of your subtance in a total of 1 million parts, meaning:
100 parts your substance + 999 900 parts solution.

I am assuming its a powder form?
Meaning it is mass in liquid.

If we use water (then 1kg=+-1l)
We can say (in general):

ppm = 1g/m³ = 1mg/L

If you thus make 1 liter you need 1mg of 100% cis-3- hexenyl acetate solution, but yours is 98%, so you would need a bit more (1,02mg).

Hi. It's in liquid form. The FW is 142.2 and relative density is 0.897 g/cm3 which is 897 kg/m3. So do I need to take 10 µl cis-3-hexenyl acetate and 990 µl solvent to make 100 ppm

Thank you

chandch on Tue Dec 11 19:20:47 2012 said:

No - that's 1 part per 100 (10 in 1000)... you need to add some zeros on the end of the solvent.

chandch on Tue Dec 11 19:20:47 2012 said:

oh my bad, did not see that.


0.897 g/cm3
and
1 mL = 1 cm3

so 0,897grams per ml.
And you need 1,02mgrams..
So how many ml do you need?

Is it 1.13 ml? But How can I calculate 10 and 100 ppm from my original liquid,. Could you please explain.

Thank you

chandch on Tue Dec 11 19:49:12 2012 said:

?
Well I just explained how to calculate the 100ppm
see:
If we use water (then 1kg=+-1l)
We can say (in general):

ppm = 1g/m³ = 1mg/L

If you thus make 1 liter you need 1mg of 100% cis-3- hexenyl acetate solution, but yours is 98%, so you would need a bit more (1,02mg).

and the previous post.

So if you know how to make 100ppm, you should be able to make 10ppm too..

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?