Accurate mass: Difference between revisions

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{{Def2|
{{final|acronym=
An experimentally determined mass of an [[ion]] that is used to determine an elemental formula. For ions containing combinations of the elements C, H, N, O, P, S, and the halogens, with mass less than 200 [[u]], a measurement with 5 ppm uncertainty is sufficient to uniquely determine the elemental composition.
|def=Experimentally determined mass of an [[ion]] of known charge.
:''Note 1'': Can be used to determine elemental composition to within limits defined by both the
accuracy and precision of the measurement.
:''Note 2'': Accurate mass and [[exact mass]] are not synonymous. Accurate mass refers to a measured mass, and exact mass refers to a calculated mass.
|rel=[[exact mass]]
|ref=O. D. Sparkman. [[Mass Spec Desk Reference]], Global View Publishing, Pittsburgh (2006).
 
A. W. T. Bristow, K. S. Webb. J. Am. Soc. Mass Spectrom. 14, 1086 (2003). (DOI: [http://dx.doi.org/10.1016/S1044-0305(03)00403-3 10.1016/S1044-0305(03)00403-3])
}}
}}
 
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== Related Terms ==
 
[[Average Mass]]
 
[[Atomic Mass Unit]]
 
[[Nominal Mass]].
 
== Other Definitiions ==
 
[http://www.spectroscopynow.com/Spy/basehtml/SpyH/1,1181,4-14-6-0-0-education_dets-0-2585,00.html Base Peak Glossary]
 
[[Mass Spec Desk Reference]]
:Measured Accurate Mass: the experimentally determined mass that allows the elemental formula to be deduced. ''Not'' to be used to indicate the [[calculated mass]].
 
 
[[Category:Mass]]
[[Category:Mass]]
{{DEFAULTSORT:Accurate Mass}}

Latest revision as of 13:01, 31 August 2017

IUPAC RECOMMENDATIONS 2013
Accurate mass
Experimentally determined mass of an ion of known charge.
Note 1: Can be used to determine elemental composition to within limits defined by both the

accuracy and precision of the measurement.

Note 2: Accurate mass and exact mass are not synonymous. Accurate mass refers to a measured mass, and exact mass refers to a calculated mass.
Related Term(s): exact mass
Reference(s):

O. D. Sparkman. Mass Spec Desk Reference, Global View Publishing, Pittsburgh (2006).

A. W. T. Bristow, K. S. Webb. J. Am. Soc. Mass Spectrom. 14, 1086 (2003). (DOI: 10.1016/S1044-0305(03)00403-3)

From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.

Index of Recommended Terms

 



Nominal mass

Related definitions

Other definitions

Mallet and Down ISBN 0470027614
"The mass of a molecule or ion calculated using the integral masses of the most abundant isotopes of each element present"
Sparkman ISBN 0966081390
"The integer mass of the most abundant naturally occurring stable isotope of an element ... the nominal mass of an element is equal to the mass number of the most abundant stable isotope of an element"
de Hoffmann ISBN 0470033118
"The nominal mass is calculated using the mass of the predominant isotope of each element rounded to the nearest integer value that corresponds to the mass number ..."
Watson and Sparkman ISBN 0470516348
"The nominal mass of an element is the integer mass of its most abundant stable isotope ... the nominal mass of a molecule, radical, or ion is the sum of the nominal masses of all the atoms of its constituent elements." (common organic elements this is the lowest but not always)
Gross ISBN 3642423469
"the nominal mass of an element is defined as the integer mass of its most abundant naturally occurring stable isotope ... the nominal mass of an ion is the sum of the nominal masses of its constituent elements."

References