|FT-ICR-MS||0.1 - 1 ppm|
|Orbitrap||0.5 - 1 ppm|
|Magnetic Sector||1 - 2 ppm|
|TOF-MS||3 - 5 ppm|
|Q-TOF||3 - 5 ppm|
|Triple Quad||3 - 5 ppm|
|Linear IonTrap||50-200 ppm|
High mass accuracy is not sufficient if mixtures are analyzed or if the isotopic fine structure of compounds needs to be evaluated. In such a case high resolving power is needed. High resolving power can be achieved by chromatography or comprehensive chromatography (GCxGC, LCxLC) or multidimensional chromatography (LCxGC). For chromatography we usually refer to a high efficiency or high number of theoretical plates. High resolving power can be obtained by mass spectrometry itself (Orbitrap or better FT-MS).
We have already proven (BMC Bioinformatics 2006, 7:234) that high mass accuracy (less than 1 ppm or even 0.1 ppm) is not enough for obtaining correct molecular formula results. Instead, additional rules and orthogonal filters need to be applied.
Intercomparison study on accurate mass measurement of small molecules in mass spectrometry
Debating Resolution and Mass Accuracy in Mass Spectrometry
High-Resolution Mass Spectrometers (Annual Reviews)
The impact of the electron mass on accurate mass determinations and mass calibrations [XLS]
Accurate mass reference tables:
ATOMIC WEIGHTS OF THE ELEMENTS: REVIEW 2000 - (IUPAC Technical Report)
Pure Appl. Chem., Vol. 75, No. 6, pp. 683–800, 2003.
J. R. DE LAETER, J. K. BÖHLKE2, P. DE BIÈVRE, H. HIDAKA, H. S. PEISER, K. J. R. ROSMAN, AND P. D. P. TAYLOR
ASCII Tables for direct import/export
Atomic Weights and Isotopic Compositions
J. S. Coursey, D. J. Schwab, J. J. Tsai, and R. A. Dragoset
Office of Electronic Commerce in Scientific and Engineering Data