38 Agilent 6500 Series Q-TOF LC/MS Maintenance Guide
2Maintenance
To prepare tuning mix
* Source: Mehdi Moini, Bruce L. Jones, Robin M. Rogers, and Longfei Jiang, “Sodium
Trifluoroacetate as a Tune/Calibration Compound for Positive- and Negative-Ion Electrospray
Ionization Mass Spectrometry in the Mass Range of 100–4000 Da,” Journal of The American
Society for Mass Spectrometry Sept. 1998: 977–980.
5 702.86381* 792.85908*
6 838.83862* 928.83389*
7 974.81343* 1064.80870
8 1110.78824* 1200.78351
9 1246.76305* 1336.75832
10 1382.73786 1472.73313
11 1518.71267 1608.70794
12 1654.68747 1744.68274
13 1790.66228 1880.65755
14 1926.63709 2016.63236
15 2062.61190 2152.60717
16 2198.58671 2288.58198
17 2334.56152 2424.55679
18 2470.53633 2560.53160
19 2606.51114 2696.50640
20 2742.48594 2832.48121
21 2878.46075 2968.45602
22 3014.43556 3104.43083
23 3150.41037 3240.40564
24 3286.38518 3376.38045
25 3422.35999 3512.35526
Table 5 Elemental compositions and calculated masses of sodium trifluoroacetate ion
clusters by electrospray ionizationunder positive-ion ([(CF3COONa)nNa]1) and
negative-ion ([(CF3COONa)nCF3COO]2) modes (continued)
n Positive-ion calculated mass Negative-ion calculated mass
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