TABLE 1. Isotopic compositions of the elements as determined by mass spectrometr Best Range of Measurement Representaive Natural from a Single rence Atomic Mass Variations Annot- Terrestrial Source Reference Materials Composition Number Symbol Number (Atom % ations (Atom % (App. A)(App. B) 1H1999816-999975mr99984426(5)2sC7 OHAGI VSMOW* 999885(70) 200184 0015574(5) 00115(0)b IAEA (in water) NIST 34.6x100.0041gr 0.0001343(13)1sC88 SANI Air 0000137(3) 100-999959 999998657(13) 99999863(3) 3 6721-7.71m,r7.589(24)2sC97 QIl IRMM016*[759(4)C 92.7992.29 92411(24) IAEA [92.41(4) RMM NIST 4 Be 9 63LEI1 1018927-20.337 1982(2)2sC 69BIE1 IRMM-011* 199(7) l181.073-79.663 80.18(2) NIST 80.1(7 29885-9902r 988922(28)PC90CHA1NBS19* 9893(8) 13 1.15-0.98 1.1078(28) IAEA 1.07(8) NIST N1499890-99652r996337(4)PC58JUN1Air 996532(7)d 50411-0.348 0.3663(4) 0.368(7) 16997384997756r 99.7628(5)IsN 76BAEI VSMOW* 99757(16) 170.0399-0.0367 0.0372(4)e 88L11 IAEA 0038(1) 180.22170.1877 0.20004(5) NIST 0.205(14) 20ASTI 100 8847gm90.4838(90)lsC84BOT1Air* 90.48(3) 0.266r 0.2696(5) 0.27(1) 925(3) 56WH 78.992(25)2sC66CAT1NsT-SRM980*7899(4) 10003(9) 1000(1) 11.005(19) 13Al2 56WHI1
TABLE 1. Isotopic compositions of the elements as determined by mass spectrometry Best Range of Measurement Available Representaive Natural from a Single Reference Isotopic Atomic Mass Variations Annot-Terrestrial Source Reference Materialsa Composition Number Symbol Number (Atom %) ations (Atom %) (App. A) (App. B) (Atom %) 12 3 4 5 6 7 8 9 1 H 1 99.9816 - 99.9975 m,r 99.984426 (5) 2s C 70HAG1 VSMOW* 99.9885 (70) 2 0.0184 - 0.0025 0.015574 (5) CEA 0.0115 (70) b IAEA (in water) NIST 2 He 3 4.6x10-8-0.0041 g,r 0.0001343(13) 1s C 88SAN1 Air* 0.000137 (3) 4 100 - 99.9959 99.9998657 (13) 99.999863 (3) (in air) 3 Li 6 7.21 - 7.71 m,r 7.589 (24) 2s C 97QI1 IRMM-016* [7.59(4)]c 7 92.79 - 92.29 92.411 (24) IAEA [92.41(4)] IRMM NIST 4 Be 9 100 63LEI1 100 5 B 10 18.927 - 20.337 m,r 19.82 (2) 2s C 69BIE1 IRMM-011* 19.9 (7) 11 81.073- 79.663 80.18 (2) NIST 80.1 (7) 6 C 12 98.85 - 99.02 r 98.8922 (28) P C 90CHA1 NBS19* 98.93 (8) 13 1.15 - 0.98 1.1078 (28) IAEA 1.07 (8) NIST 7 N 14 99.890 -99.652 r 99.6337 (4) P C 58JUN1 Air* 99.632 (7) d 15 0.411 - 0.348 0.3663 (4) IAEA 0.368 (7) NIST 8 O 16 99.7384 -99.7756 r 99.7628 (5) 1s N 76BAEl VSMOW* 99.757 (16) 17 0.0399 - 0.0367 0.0372 (4) e 88LI1 IAEA 0.038 (1) 18 0.2217 - 0.1877 0.20004 (5) NIST 0.205 (14) 9 F 19 100 20AST1 100 10 Ne 20 90.514 - 88.47 g,m 90.4838 (90) 1s C 84BOT1 Air* 90.48 (3) 21 1.71 - 0.266 r 0.2696 (5) 0.27 (1) 22 9.96 - 9.20 9.2465 (90) 9.25 (3) (in air) 11 Na 23 100 56WHI1 100 12 Mg 24 78.992 (25) 2s C 66CAT1 NIST-SRM980* 78.99 (4) 25 10.003 (9) 10.00 (1) 26 11.005 (19) 11.01 (3) 13 Al 27 100 56WHI1 100
Range of Measurement Available Representaive Natural from a Single Reference Isotopic Atomic Mass Variations Annot- Terrestrial Source Reference Materials Number Symbol Number (Atom % ations (Atom (App. A)(App. B) (Atom % 289221-9225r 9222968(44)2sC97GON1IAEA 922297(7) 4.69-4.67 4.68316(32) IRMM 4.6832(5) 303.10-3.08 3.08716(48 NIST 3.0872(5) 15 63LEI1 163294.537-95.261r95018(4)PC50 MACI CEA 9493(31) 330.7870.731 0.750(7 IAEA 0.76(2) 44655-3.993 4215(4) NIST 4.29(28) 6 0.021-0.015 0.017(2) 002(1) C13575.64-75.86 75771(45)2sC62 SHIl NIST-SRM97575.78(4 37 24.36-24.14 24.229(45) 24.22(4) Ar 36 g 0.3365(6)PC50NHE1Air 03365(30) 00632(1) 0.0632(5) 996003(6) 996003(30) In air K 9325811(292)2sC75 GARI NIST-SRM985*93.2581(44) 0011672(41 00117(1) 6.73022(292) 6.7302(44) 0Ca4096.982-96880gr96.941(6)2sN72MOO1 NIST-SRM915*96941(156 420.656-0.640 0647(3) 0647(23) 0.135(2) 0.135(10) 442.130-2.057 2086(4) 2.086(110) 460.0046-0.0031 0.004(1) 0.004(3) 480.2000.179 0.187(1) 0.187(21) SoLELI 100 8249(21)2sC93SHl 825(3) 744(2) 5409(10) 5.4l(2) 5.185(13) 5.18(2) 23V500.2502-0.2487g0.2497(6)lsF66FLEl 0.250(4) 43452(85)2sC66SH1 NIST-SRM979*4.345(13) 837895(117) 83789(18) 9501(1 23647(48) 2.365(7)
Best Range of Measurement Available Representaive Natural from a Single Reference Isotopic Atomic Mass Variations Annot-Terrestrial Source Reference Materialsa Composition Number Symbol Number (Atom %) ations (Atom %) (App. A) (App. B) (Atom %) 12 3 4 5 6 7 8 9 14 Si 28 92.21 - 92.25 r 92.22968 (44) 2s C 97GON1 IAEA 92.2297 (7) 29 4.69 - 4.67 4.68316 (32) IRMM 4.6832 (5) 30 3.10 - 3.08 3.08716 (48) NIST 3.0872 (5) 15 P 31 100 63LEI1 100 16 S 32 94.537 - 95.261 r 95.018 (4) P C 50MAC1 CEA 94.93 (31) 33 0.787 - 0.731 0.750 (7) IAEA 0.76 (2) 34 4.655 - 3.993 4.215 (4) NIST 4.29 (28) 36 0.021 -0.015 0.017 (2) 0.02 (1) 17 Cl 35 75.64 - 75.86 m 75.771 (45) 2s C 62SHI1 NIST-SRM975* 75.78 (4) 37 24.36 - 24.14 24.229 (45) 24.22 (4) 18 Ar 36 g 0.3365 (6) P C 50NIE1 Air* 0.3365 (30) 38 0.0632 (1) 0.0632 (5) 40 99.6003 (6) 99.6003 (30) (in air) 19 K 39 93.25811 (292) 2s C 75GAR1 NIST-SRM985* 93.2581 (44) 40 0.011672 (41) 0.0117 (1) 41 6.73022 (292) 6.7302 (44) 20 Ca 40 96.982 - 96.880 g,r 96.941 (6) 2s N 72MOO1 NIST-SRM915* 96.941 (156) h 42 0.656 - 0.640 0.647 (3) 0.647 (23) 43 0.146 - 0.131 0.135 (2) 0.135 (10) 44 2.130 - 2.057 2.086 (4) 2.086 (110) 46 0.0046 - 0.0031 0.004 (1) 0.004 (3) 48 0.200 - 0.179 0.187 (1) 0.187 (21) 2l Sc 45 100 50LEL1 100 22 Ti 46 8.249 (21) 2s C 93SHI1 8.25 (3) 47 7.437 (14) 7.44 (2) 48 73.720 (22) 73.72 (3) 49 5.409 (10) 5.41 (2) 50 5.185 (13) 5.18 (2) 23 V 50 0.2502 - 0.2487 g 0.2497 (6) 1s F 66FLE1 0.250 (4) 51 99.7513 - 99.7498 99.7503 (6) 99.750 (4) 24 Cr 50 4.3452 (85) 2s C 66SHI1 NIST-SRM979* 4.345 (13) 52 83.7895 (117) 83.789 (18) 53 9.5006 (110) 9.501 (17) 54 2.3647 (48) 2.365 (7)
Range of Measurement Available Representaive Natural from a Single Reference Isotopic Atomic Mass Variations Annot- Terrestrial Source Reference Materials Number Symbol Number (Atom % ations (Atom (App. A)(App. B) (Atom % Mn 55 00 63LEIl 5845(23)2sC92TAY1IRMM014*5.845(35 91.754(24) 91.754(36) 0.2819(27) 0.282 63LEI1 (59)2sC89 62231(51) 26.2231(77) 1399(4) 3.6345(11 36345(17) 64 0.9256(6 0.9256(9) 29Cu636924-6898r69.174(20)2sC64SH1 NIST-SRM976*69.17(3) 6531.02-30.76 30.826(20) 30.83(3 4863(20)2sF72ROSl 27.90(9) 27.90(27 4.10(4) 4.10(13) 68 18.75(17) 18.75(51) 60.1079(62)2sC86 MACI NIST-SRM994*60.108(9) 398921(62) 39892(9) 21.234(31)lsL86GRE1 20.84(87 27.54(34 7.717(5 7.444(14) 7.61(38) 63LEIl 0889(3)1sN89wAC 089(4) 76 937(29) 3772(20) 49.607(17) 4961(41) 8.731(10) 50.686(26)2sC64CAT1 NIST-SRM977*50.69(7 49.314(26) 6Kr78 gm0.35351(7)2sN94VAL1 0.35(1) 2.28(6) 58304(76) 1149533(35) 11.49(6) 5698890(62) 7.00(4) 17.29835(26) 17.30(22)
Best Range of Measurement Available Representaive Natural from a Single Reference Isotopic Atomic Mass Variations Annot-Terrestrial Source Reference Materialsa Composition Number Symbol Number (Atom %) ations (Atom %) (App. A) (App. B) (Atom %) 12 3 4 5 6 7 8 9 25 Mn 55 100 63LEI1 100 26 Fe 54 5.845(23) 2s C 92TAY1 IRMM-014* 5.845 (35) 56 91.754(24) 91.754 (36) 57 2.1191(65) 2.119 (10) 58 0.2819(27) 0.282 (4) 27 Co 59 100 63LEI1 100 28 Ni 58 68.0769 (59) 2s C 89GRA1 68.0769 (89) 60 26.2231 (51) 26.2231 (77) 61 1.1399 (4) 1.1399 (6) 62 3.6345 (11) 3.6345 (17) 64 0.9256 (6) 0.9256 (9) 29 Cu 63 69.24 - 68.98 r 69.174 (20) 2s C 64SHI1 NIST-SRM976* 69.17 (3) 65 31.02 - 30.76 30.826 (20) 30.83 (3) 30 Zn 64 48.63 (20) 2s F 72ROS1 48.63 (60) 66 27.90 (9) 27.90 (27) 67 4.10 (4) 4.10 (13) 68 18.75 (17) 18.75 (51) 70 0.62 (1) 0.62 (3) 31 Ga 69 m 60.1079 (62) 2s C 86MAC1 NIST-SRM994* 60.108 (9) 71 39.8921 (62) 39.892 (9) 32 Ge 70 21.234 (31) 1s L 86GRE1 20.84 (87)k 72 27.662 (29) 27.54 (34) 73 7.717 (5) 7.73 (5) 74 35.943 (25) 36.28 (73) 76 7.444 (14) 7.61 (38) 33 As 75 100 63LEI1 100 34 Se 74 r 0.889 (3) 1s N 89WAC1 0.89 (4) 76 9.366 (18) 9.37 (29) 77 7.635 (10) 7.63 (16) 78 23.772 (20) 23.77 (28) 80 49.607 (17) 49.61 (41) 82 8.731 (10) 8.73 (22) 35 Br 79 50.686 (26) 2s C 64CAT1 NIST-SRM977* 50.69 (7) 81 49.314 (26) 49.31 (7) 36 Kr 78 g,m 0.35351 (7) 2s N 94VAL1 0.35 (1) 80 2.28086(29) 2.28 (6) 82 11.58304 (76) 11.58 (14) 83 11.49533 (35) 11.49 (6) 84 56.98890 (62) 57.00 (4) 86 17.29835(26) 17.30 (22) (in air)