Convert ppm to micrograms per cubic metre

[Unregistered]

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

Thanks,

John

[Robert Fogt]

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]

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]

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]

Oh dear... for ug, 677,600 or thereabouts.

[Unregistered]

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]

i just want to know how to convert moles to micro grams

[rafael]

i just want to know how to convert moles to micro grams
HELLO OFF BRAZIL .............

[Unregistered]

Caline 4 indicates results give CO prediction at 14ppm . how do I convert it to micrograms per cubic metre?

[Unregistered]

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)

Follow Mrs X's instructions

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

[Unregistered]

I need a conversion of 4.08 grams per cubic metre to ppm.

Thanks,

naresh

[Mrs X]

Hi, is it for a gas system? If so, ppm is µL/L.

[Unregistered]

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.

Please clarify

[Unregistered]

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]

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]

CO= 257.14ppm to mg/Ncm

[Unregistered]

please convert 5 ppm into gram per metre cube




thanks
nishi

[JohnS]

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]

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]

i need to convert 2,253.4 ppm to %

[JohnS]

i need to convert 2,253.4 ppm to %

Divide by 10000, 0.22534%

[niaz]

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 )

but with follow equation the answer is 3*M *(1000/24.45 )

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

what is my mistake?

[Mrs X]

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 )

but with follow equation the 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]

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]

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]

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