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#31
07-09-2010, 08:25 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Thanks, John S. OK, last one for me: if you have %V/V = .05, doesn't that equal to 500PPM?
#32
07-09-2010, 09:23 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,711 Rep Power: 17
Re: mg/kg to ppm

Quote:
 Originally Posted by Unregistered Thanks, John S. OK, last one for me: if you have %V/V = .05, doesn't that equal to 500PPM?
Yes. But recognize that ppm is ambiguous. It can be figured as weight/weight, volume/volume, molar ratios, or even weight/volume. These generally give different ppm answers so you have to know which ratio is meant.
#33
08-17-2010, 01:55 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

[QUOTE=JohnS;63751]
Quote:
 Originally Posted by Unregistered Parts per million can be computed on either a mass/mass, volume/volume, or moles/moles ratio. If mass/mass, 2mg/kg IS 2 ppm as milligrams and kilograms are 10^6 apart. On a volume or mole fraction ratio, we have insufficient info. Actually, because it is clear that it is a mass ratio, 2 mg/kg is the preferred form, rather than 2 ppm, which is ambiguous.
Both mg/kg (1/1.000) and ppm (1/1.000.000) are ratios, and ppm is not always equal mg/kg, only when it is the same matter. As mike said "mg/kg is not equal to ppm. The conversion depends on the density of both substances. In other words, mg/kg is not mg of water to kg of water, it is mg of x in kg of y". It also depends on the temperature, because diferrent matter have different physical properties.

so yes you can roughly say mg/kg = ppm. But it is not correct. F.ex. when you calculate formaldehyde you use a ratio of 1ppm = 1.2mg/kg. (reference: the danish, Erhvervs- og Byggestyrelsens rapport ”Helbredseffekter og gener ved udsættelse for formaldehyd”, 1988)
#34
08-17-2010, 02:19 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,711 Rep Power: 17
Re: mg/kg to ppm

Quote:
 Originally Posted by Unregistered Both mg/kg (1/1.000) and ppm (1/1.000.000) are ratios, and ppm is not always equal mg/kg, only when it is the same matter. As mike said "mg/kg is not equal to ppm. The conversion depends on the density of both substances. In other words, mg/kg is not mg of water to kg of water, it is mg of x in kg of y". It also depends on the temperature, because diferrent matter have different physical properties. so yes you can roughly say mg/kg = ppm. But it is not correct. F.ex. when you calculate formaldehyde you use a ratio of 1ppm = 1.2mg/kg. (reference: the danish, Erhvervs- og Byggestyrelsens rapport ”Helbredseffekter og gener ved udsættelse for formaldehyd”, 1988)
"The same matter" is ALWAYS 1 million parts per million. The concept only makes sense for mixtures. Note that the ratio between milligrams and kilograms is one million, hence mg/kg is ppm w/w.

Gas mixtures are normally specified on a µmol/mol basis, so if you have w/w data, it needs to be corrected by molecular weights (molar masses).
#35
09-21-2010, 02:05 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Why such complex answers? The conversion factor is "1". Therefore 1mg/kg = 1ppm
#36
10-14-2010, 12:06 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Quote:
 Originally Posted by Unregistered Convert lead concentrations in ash from mg/kg to ppm
69mg/kg P2O5 in soil to ppm
#37
11-23-2010, 12:09 PM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Im I right in saying:
101 mg/kg = 0.101/1000 = 101/1,000,000 = 101 PPM?
#38
11-23-2010, 12:30 PM
 mader0007 Junior Member Join Date: Nov 2010 Posts: 1 Rep Power: 0
Re: mg/kg to ppm

Am I right in saying:
101 mg/kg =
0.101/1000 =
101/1,000,000 =
101 PPM
#39
11-23-2010, 12:42 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,711 Rep Power: 17
Re: mg/kg to ppm

Quote:
 Originally Posted by mader0007 Am I right in saying: 101 mg/kg = 0.101/1000 = 101/1,000,000 = 101 PPM
1 kg = 1 million milligrams, so, yes.
#40
01-29-2011, 02:52 AM
 Unregistered Guest Posts: n/a
Re: 25mg/kg to ppm

Quote:
 Originally Posted by Unregistered Convert lead concentrations in ash from mg/kg to ppm
am I right to quote =

200 mg/kg =
200/1000000=0,0002
=0.02%

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