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  #1  
Old 05-09-2006, 07:07 AM
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Post mg/kg to ppm

Convert lead concentrations in ash from mg/kg to ppm
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  #2  
Old 05-09-2006, 10:10 PM
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Default 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
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Old 09-06-2007, 02:35 AM
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Thumbs up 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
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Old 04-03-2009, 10:32 AM
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Default 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.
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Old 04-03-2009, 01:00 PM
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Default 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.
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Old 04-03-2009, 06:45 PM
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Default 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.
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Old 05-06-2009, 11:25 AM
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Default Re: mg/kg to ppm

mg/kg to mg/l?
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Old 06-16-2009, 06:03 PM
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Question 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?
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Old 07-17-2009, 02:31 AM
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Question Re: mg/kg to ppm

[QUOTE=Unregistered;4284]Convert 2mg/kg to ppm
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Old 07-17-2009, 02:42 AM
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Default Re: mg/kg to ppm

[QUOTE=Unregistered;63749]
Quote:
Originally Posted by Unregistered View Post
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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