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#1
05-09-2006, 08:07 AM
 Unregistered Guest Posts: n/a
mg/kg to ppm

Convert lead concentrations in ash from mg/kg to ppm
#2
05-09-2006, 11:10 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,414 Rep Power: 12
Re: mg/kg to ppm

mg/kg is the same as ppm, so no conversion will be necessary.

mg/kg = 0.001/1000 = 0.000001 = 1/1,000,000 = ppm
#3
09-06-2007, 03:35 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Quote:
 Originally Posted by Robert Fogt mg/kg is the same as ppm, so no conversion will be necessary. mg/kg = 0.001/1000 = 0.000001 = 1/1,000,000 = ppm
thanks a lot
#4
04-03-2009, 11:32 AM
 Mike Guest Posts: n/a
Re: mg/kg to ppm

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.
#5
04-03-2009, 02:00 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: mg/kg to ppm

Quote:
 Originally Posted by Mike 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.
Ppm on a mass over mass basis is exactly mg/kg. You might want to look at sections 7.10.3 and 8.6 of NIST SP811.
#6
04-03-2009, 07:45 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,379 Rep Power: 11
Re: mg/kg to ppm

Quote:
 Originally Posted by Mike 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.
Hi Mike, for your example here, remember that it is mg of x in kg of (x+y). If you have a question, you are welcome to ask it.
#7
05-06-2009, 12:25 PM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

mg/kg to mg/l?
#8
06-16-2009, 07:03 PM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

Isn't it the case that "ppm" is a relative volumetric ratio, regardless of density, whereas "mg/kg" is a relative mass ratio?
#9
07-17-2009, 03:31 AM
 Unregistered Guest Posts: n/a
Re: mg/kg to ppm

[QUOTE=Unregistered;4284]Convert 2mg/kg to ppm
#10
07-17-2009, 03:42 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: mg/kg to ppm

[QUOTE=Unregistered;63749]
Quote:
 Originally Posted by Unregistered Convert 2mg/kg to ppm
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.

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