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#1




mg/kg to ppm
Convert lead concentrations in ash from mg/kg to ppm

#2




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




Re: mg/kg to ppm
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#4




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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Re: mg/kg to ppm
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#6




Re: mg/kg to ppm
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#7




Re: mg/kg to ppm
mg/kg to mg/l?

#8




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




Re: mg/kg to ppm
[QUOTE=Unregistered;4284]Convert 2mg/kg to ppm

#10




Re: mg/kg to ppm
[QUOTE=Unregistered;63749]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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