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#1
04-18-2006, 11:49 AM
 Unregistered Guest Posts: n/a
Convert ppm to micrograms per cubic metre

I need a conversion of 330 ppm of NO2 to micrograms per cubic metre.

Thanks,

John
#2
04-18-2006, 03:55 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,414 Rep Power: 12
Re: Convert ppm to micrograms per cubic metre

ppm is equivalent to mg/kg

So you just need to find out the density of the solution. Multiply the density in kg/m³ by mg/kg and you get mg/m³. From there its not difficult to convert mg/m³ to µg/m³

Not exactly sure of your situation, is it parts NO2 per million parts solution? Then its the solution you need the density of.
#3
04-19-2006, 05:08 AM
 Unregistered Guest Posts: n/a
Re: Convert ppm to micrograms per cubic metre

Thanks Robert.

My situation is that we have taken an emissions test. The air sample contained 330 ppm of NO2.

Does this information help.

John
#4
04-19-2006, 03:33 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,379 Rep Power: 11
Re: Convert ppm to micrograms per cubic metre

Hi,

for gas systems, 330ppm is 330uL/L, or 0.33L/cubic meter

I'm off work at the moment for school holidays, and my SI Chemical data book is at work.

However from memory, one mole of gas occupys 22.4L at stp (0°C, 1atm). The molar mass of NO2 is 46g/mol, so

0.33/22.4 x 46 = 0.6776g.

This is 677.6mg per cubic meter. You will need to correct this for the actual amount that one mole of gas occupies at whatever temperature your sample was measured at. Sorry about the lack of concrete help.
#5
04-19-2006, 03:35 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,379 Rep Power: 11
Re: Convert ppm to micrograms per cubic metre

Oh dear... for ug, 677,600 or thereabouts.
#6
04-19-2006, 08:51 PM
 Unregistered Guest Posts: n/a
Re: Convert ppm to micrograms per cubic metre

Thanks.

The temperature of the gas was 943° F
The temperature of the air was 48° F

I hope this is enough information to get the conversion.

John
#7
06-20-2006, 08:44 PM
 Unregistered Guest Posts: n/a
Re: Convert moles to micro grams

i just want to know how to convert moles to micro grams
#8
06-21-2006, 05:31 PM
 rafael Guest Posts: n/a
Re: Convert moles to micro grams

Quote:
 Originally Posted by Unregistered i just want to know how to convert moles to micro grams
HELLO OFF BRAZIL .............
#9
06-27-2006, 02:54 AM
 Unregistered Guest Posts: n/a
Re: Convert ppm to micrograms per cubic metre

Caline 4 indicates results give CO prediction at 14ppm . how do I convert it to micrograms per cubic metre?
#10
09-08-2006, 02:12 AM
 Unregistered Guest Posts: n/a
Re: Convert ppm to micrograms per cubic metre

Dear John,

Mrs X has basically told you what to do but you also need to ensure that you correct for temperature

ppm(stp) = ppm(@ Tm) x Tstp / Tm

where Tm is the temperature measured and T stp is the standard temp & pressure

so convert Temp in F to K (Check this, formula I'm not US and who else in the world still uses F, miles etc But I digress....

Kelvin = 273 + 32 + 1.8F)

ug/m3 = 273/(305 + 1.8F) * ppm (@tm) * M (eg SO2 = 64) / 22.4

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