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Appendix B Overview of Isotopes
B-8 Applied Biosystems
B
B.3 Isotopes of Common Elements
Table B-1 lists the natural abundance of isotopes for some
common elements seen in mass spectrometry
Table B-1 Isotopes of Common Elements
1
Isotope Mass
Natural
abundance
(%)
Isotope Mass
Natural
abundance
(%)
1
H 1.0078 99.985
31
P 30.9737 100
2
H 2.0141 0.015
32
S 31.9720 95.02
12
C 12 98.90
33
S 32.9714 0.75
13
C 13.0033 1.10
34
S 33.9678 4.21
14
N 14.0030 99.63
36
S 35.9670 0.02
15
N 15.0001 0.37
35
Cl 34.9688 75.77
16
O 15.9949 99.76
37
Cl 36.9659 24.23
17
O 16.9991 0.04
39
K 38.9637 93.2581
18
O 17.9991 0.200
40
K 39.9639 0.012
19
F 18.9984 100
41
K 40.9618 6.7302
23
Na 22.9897 100
79
Br 78.9183 50.69
28
Si 27.9769 92.23
81
Br 80.9162 49.31
29
Si 28.9764 4.67
127
I 126.9044 100
30
Si 29.9737 3.10
____ ____ ____
1. Meth. Enzymol., McCloskey, J.A, ed., 1990, 193.