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#1
10-14-2008, 10:32 AM
 AwaitingActivation Guest Posts: n/a
Dalton-->ppm

hey guys,

I need to convert 50 ppm to Da. Can someone please help! I have been struggling with the conversion.

Thanks,
rpatel10
#2
10-14-2008, 02:24 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: Dalton-->ppm

Quote:
 Originally Posted by AwaitingActivation hey guys, I need to convert 50 ppm to Da. Can someone please help! I have been struggling with the conversion. Thanks, rpatel10
Dalton is simply the alternate name for unified atomic mass unit. It is basically the molecular weight of a compound, independent of the concentration. It is also numerically equal to the molar mass in grams per mole.
#3
06-23-2010, 12:51 PM
 Unregistered Guest Posts: n/a
Re: Dalton-->ppm

Although this thread seems to be dead, I thought I would give another answer. Although I believe that this applies generally, I have seen it most often applied in the analytical chemistry, specifically mass spectrometry.

When we say percent we mean parts per hundred. So parts per million (PPM) is conceptually similar to a percentage. 50% = 50/100 in the same way 50 PPM is 50/1000000. Assume that you measure the mass of something that is 80 Da and something that is 10 kDa in an instrument with an error of 50 PPM. Your relative error for both is 50 PPM but your absolute error for the 80 Da measurement is 0.004 Da or 4 mDa and your absolute error for the 10, 000 Da measurements is 0.5 Da or 500 mDa.
#4
02-02-2012, 02:39 AM
 Unregistered Guest Posts: n/a
Re: Dalton-->ppm

#5
04-06-2012, 10:17 AM
 Unregistered Guest Posts: n/a
Re: Dalton-->ppm

If you wanted, here is the "plug and chug" formula:

(theoretical mass) / ((1/errorPPM)*1,000,000) = error(Da)

(theoretical mass) / ((1/errorPPM)*1,000) = error(mDa)

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