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ppb to ug/m3
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Dear convert-me.com forum visitors,
Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.
All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page
Thank you for being with us and sorry for any inconveniences this could caused.
3 posts
• Page 1 of 1
ppb to ug/m3
by Thewall91 » Mon Mar 21, 2005 10:35 pm
I'm having trouble converting sulfur dioxide concentrations from ppb to ug/m3. Can anyone help me with this?
- Thewall91
- Posts: 1
- Joined: Mon Mar 21, 2005 10:32 pm
by Guest » Tue Mar 22, 2005 1:12 am
"parts per billon" can only compare like quantities, not mixed quantities like volume and mass. billion = 10^9, so 1 ppb is 1 in 10^9 of the same quantity, for example ug/kg.
You know the mass of the SO2. Now, what is your m^3 a m^3 of. You have to know what it is and what it weighs. A m^3 of water has a mass of about 1000 kg (varies a little with temperature). 1 m^3 of airs has a mass of about 1.3 kg at standard temperature and pressure, and varies (considerably) according to the ideal gas law. People are most commonly concerned with pollution of air and water, but if it is something else, you have to find the density and determine the mass.
You know the mass of the SO2. Now, what is your m^3 a m^3 of. You have to know what it is and what it weighs. A m^3 of water has a mass of about 1000 kg (varies a little with temperature). 1 m^3 of airs has a mass of about 1.3 kg at standard temperature and pressure, and varies (considerably) according to the ideal gas law. People are most commonly concerned with pollution of air and water, but if it is something else, you have to find the density and determine the mass.
- Guest
by Guest » Wed Mar 30, 2005 10:42 pm
Ideal Gas Law: PV = nRT
Vcont = nRT/P, where:
R = 8.314 N-m/(mol-K)
T = 278 K
P = 101325 N/m2
Vcont/n = RT/P = 0.022810679
Ca = ppm * MW/(RT/P)
MW (SO2) = 64 g/mol
ppb ppm Ca (ug/m3)
SO2 (worst) 59 0.059 166
SO2 (second worst) 16 0.016 45
SO2 (third worst) 15 0.015 42
Vcont = nRT/P, where:
R = 8.314 N-m/(mol-K)
T = 278 K
P = 101325 N/m2
Vcont/n = RT/P = 0.022810679
Ca = ppm * MW/(RT/P)
MW (SO2) = 64 g/mol
ppb ppm Ca (ug/m3)
SO2 (worst) 59 0.059 166
SO2 (second worst) 16 0.016 45
SO2 (third worst) 15 0.015 42
- Guest
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