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Unregistered
04-18-2006, 11:49 AM
I need a conversion of 330 ppm of NO2 to micrograms per cubic metre.

Thanks,

John

Robert Fogt
04-18-2006, 03:55 PM
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.

Unregistered
04-19-2006, 05:08 AM
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

Mrs X
04-19-2006, 03:33 PM
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.

Mrs X
04-19-2006, 03:35 PM
Oh dear... for ug, 677,600 or thereabouts.

Unregistered
04-19-2006, 08:51 PM
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

Unregistered
06-20-2006, 08:44 PM
i just want to know how to convert moles to micro grams

rafael
06-21-2006, 05:31 PM
i just want to know how to convert moles to micro grams
HELLO OFF BRAZIL .............

Unregistered
06-27-2006, 02:54 AM
Caline 4 indicates results give CO prediction at 14ppm . how do I convert it to micrograms per cubic metre?

Unregistered
09-08-2006, 02:12 AM
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

Unregistered
05-01-2007, 05:08 AM
I need a conversion of 4.08 grams per cubic metre to ppm.

Thanks,

naresh

Mrs X
05-02-2007, 03:05 AM
Hi, is it for a gas system? If so, ppm is µL/L.

Unregistered
08-17-2007, 05:33 AM
Hi!

Thanks for the handy formula....

My question is can CALINE-4 be used for Non-reacting pollutants like NOx and not only for CO. As far as I remember CALINE 3 was more versetile model, in which we could model SPM, SOx and NOx.

Unregistered
10-23-2007, 07:29 AM
Easiest way of converting ug/m3 to PPM and backwards is to follow the equation:

Mass conc (ug/m3) = volume mixing ratio(ppm) x (pressure x Molar Mass / RT)

so changing things around you can get:

Volume Mixing Ratio (ppm) = [mass conc.(ug/m3) x RT] / [Pressure x Molar Mass]

This works for me everytime.
By the way:
R=8.314 (gas constant)
T=Temperature i.e. 298K

Then if you want to convert to PPB from PPM obviously mulitply by 1000.
Hope this helps...
Slim

Unregistered
11-28-2007, 03:18 AM
Along similar lines to the previous entries I have been using the said formula to convert ppm to mg/m^3. We are measuring styrene levels on one of our processes, inside the process room I have used constants at 25C and 1atm, but we also have an extraction system which moves the air at fast speeds. Will this effect the results I'm getting, if so is there some way I can accomodate for the volume of air passing over the Drager tube?

Many thanks

Nick

Unregistered
12-06-2007, 12:15 AM
CO= 257.14ppm to mg/Ncm

Unregistered
01-31-2008, 12:57 AM
please convert 5 ppm into gram per metre cube

thanks
nishi

JohnS
02-02-2008, 06:25 AM
please convert 5 ppm into gram per metre cube

thanks
nishi

Ppm for a gas is based on µmol/mol. To convert the µmol of pollutant to a weight, we have to know it's molecular weight. The mole of air is converted based on molar volume, for which we need temperature and pressure (standard for EPA, OSHA in US is 1 atm, 25 °C)

Unregistered
10-22-2010, 04:30 PM
I realize this is OLD, but...

ppm to mg/m3 = (#ppm)(molecular wt.)/24.45

mg/m3 to ppm = (#mg/m3)(24.45)/molecular wt.

Based on 25 deg C and 1 Atm.

Unregistered
12-05-2011, 07:04 PM
i need to convert 2,253.4 ppm to %

JohnS
12-06-2011, 04:37 AM
i need to convert 2,253.4 ppm to %

Divide by 10000, 0.22534%

niaz
05-09-2012, 09:10 AM
i am really confused about converting microgram per cubic meters to ppm.
i know 1 microgram per cubic meter= M *(1000/24.45 )*ppm

so 3 microgram per cubic meter = ??? ppm

the correct answer is 3/ M *(1000/24.45 )

1/3 = M *(1000/24.45 )/???

what is my mistake?

Mrs X
05-09-2012, 08:57 PM
i am really confused about converting microgram per cubic meters to ppm.
i know 1 microgram per cubic meter= M *(1000/24.45 )*ppm

so 3 microgram per cubic meter = ??? ppm

the correct answer is 3/ M *(1000/24.45 )

1/3 = M *(1000/24.45 )/???

what is my mistake?

Hi niaz, can you explain what you are trying to do? - It depends on whether you have a liquid or gas as to the answer. :)

Unregistered
11-15-2012, 11:24 AM
Please anybody can give me a formula for dynamic conversion of ppm to mg/m3 for any gas ? If I have the concentration in ppm, temperature, pressure and molecular mass of the gas then how i will convert for example 100ppm of CO at 50 oC and 11000Pa what will be mg/m3 or g/m3. Please if anybody can explain how the unit g/m3 comes from ppm which will be best for me.
Regards
Niroj

JohnS
11-15-2012, 03:51 PM
Please anybody can give me a formula for dynamic conversion of ppm to mg/m3 for any gas ? If I have the concentration in ppm, temperature, pressure and molecular mass of the gas then how i will convert for example 100ppm of CO at 50 oC and 11000Pa what will be mg/m3 or g/m3. Please if anybody can explain how the unit g/m3 comes from ppm which will be best for me.
Regards
Niroj

At 101.325 kPa and 0 °C (normal)
multiply ppm by MW/22.414, where MW is molecular weight of the trace pollutant, or its molar mass, and 22.414 (liters) is the molar volume of the mixture

For other conditions
ppm x MW/22.414 x 273.15 K/T x P/101.325 kPa
(both temperature and pressure must be absolute, T in kelvins)

Unregistered
05-10-2013, 12:17 AM
ug/m3 = 273/(305 + 1.8F) * ppm (@tm) * M (eg SO2 = 64) / 22.4 THIS IS EQUATION IS WRONG @ UNIT.

IT SHOULD BE
ug/cm3 = 273/(305 + 1.8F) * ppm (@tm) * M (eg SO2 = 64) / 22.4

Thanks,

R.K

kamlesh
08-07-2013, 05:23 PM
Hi,
Can someone help me with conversion of ppm for 48g/cubic meter

Thanks

anil khandhediya
09-11-2013, 05:33 PM
i need a conversion with calculation of 25 ppm of NOx to micrograms per cubic metre.

Thanks,

anil