Summary table of mean ocean concentrations and residence times. See the page of each element for references. The concentration generally decreases with increasing atomic number. The residence time is generally longer for elements with higher concentrations.
Atomic # | Element | Mean Ocean | Atomic Mass | Mean Ocean | Mean Ocean | UNIT | Residence Time |
xxx | xxx | Conc. | xxx | Conc. | Conc | xxx | yrs |
xxx | xxx | ng/kg | g/mol | nmol/kg | Rational Units | ||
1 | H+ | xxx | xxx | 1.20E+01 | 12 | nmol/kg | |
2 | He | 7.60E+00 | 4.0026 | 1.90E+00 | 1.9 | nmol/kg | |
3 | Li | 1.80E+05 | 6.9410 | 2.59E+04 | 25.9 | µmol/kg | 2,800,000 |
4 | Be | 2.10E-01 | 9.0122 | 2.33E-02 | 23 | pmol/kg | 1,000 |
5 | B | 4.50E+06 | 10.8110 | 4.16E+05 | 416 | µmol/kg | 9,600,000 |
6 | C | 2.70E+07 | 12.0110 | 2.25E+06 | 2.248 | mmol/kg | 83,000 |
7 | N2 | 8.30E+06 | 14.0067 | 5.93E+05 | 590 | µmol/kg | |
7 | NO3 | 4.20E+05 | 14.0067 | 3.00E+04 | 30 | µmol/kg | 3,000 |
8 | O2 | 2.80E+06 | 15.9994 | 1.75E+05 | 175 | µmol/kg | |
9 | F | 1.30E+06 | 18.9984 | 6.84E+04 | 68 | µmol/kg | 500,000 |
10 | Ne | 1.60E+02 | 20.1797 | 7.93E+00 | 7.9 | nmol/kg | |
11 | Na | 1.08E+10 | 22.9898 | 4.69E+08 | 469 | mmol/kg | 55,000,000 |
12 | Mg | 1.28E+09 | 24.3050 | 5.27E+07 | 52.7 | mmol/kg | 13,000,000 |
13 | Al | 3.00E+01 | 26.9815 | 1.11E+00 | 1.11 | nmol/kg | 200 |
14 | Si | 2.80E+06 | 28.0855 | 9.97E+04 | 99.7 | µmol/kg | 20,000 |
15 | PO4 | 6.20E+04 | 30.9738 | 2.00E+03 | 2 | µmol/kg | 69,000 |
16 | SO4-- | 8.98E+08 | 32.0660 | 2.80E+07 | 28 | mmol/kg | 8,700,000 |
17 | Cl- | 1.94E+10 | 35.4527 | 5.46E+08 | 546 | mmol/kg | 87,000,000 |
18 | Ar | 6.20E+05 | 39.9480 | 1.55E+04 | 15.5 | µmol/kg | |
19 | K | 3.99E+08 | 39.0983 | 1.02E+07 | 10.2 | mmol/kg | 12,000,000 |
20 | Ca | 4.12E+08 | 40.0780 | 1.03E+07 | 10.27 | mmol/kg | 1,100,000 |
21 | Sc | 7.00E-01 | 44.9559 | 1.56E-02 | 16 | pmol/kg | |
22 | Ti | 6.50E+00 | 47.8800 | 1.36E-01 | 136 | pmol/kg | 150 |
23 | V | 2.00E+03 | 50.9415 | 3.93E+01 | 39 | nmol/kg | 50,000 |
24 | Cr(VI) | 2.10E+02 | 51.9960 | 4.04E+00 | 4 | nmol/kg | 8,000 |
25 | Mn | 2.00E+01 | 54.9380 | 3.64E-01 | 360 | pmol/kg | 60 |
26 | Fe | 3.00E+01 | 55.8470 | 5.37E-01 | 540 | pmol/kg | 500 |
27 | Co | 1.20E+00 | 58.9332 | 2.04E-02 | 20 | pmol/kg | 340 |
28 | Ni | 4.80E+02 | 58.6934 | 8.18E+00 | 8.2 | nmol/kg | 6,000 |
29 | Cu | 1.50E+02 | 63.5460 | 2.36E+00 | 2.4 | nmol/kg | 5,000 |
30 | Zn | 3.50E+02 | 65.3900 | 5.35E+00 | 5.4 | nmol/kg | 50,000 |
31 | Ga | 1.20E+00 | 69.7230 | 1.72E-02 | 17 | pmol/kg | 500 |
32 | Ge | 5.50E+00 | 72.6100 | 7.57E-02 | 75 | pmol/kg | 20,000 |
33 | As | 1.20E+03 | 74.9216 | 2.00E+01 | 20 | nmol/kg | 39,000 |
34 | Se | 1.55E+02 | 78.9600 | 1.96E+00 | 1.9 | nmol/kg | 26,000 |
35 | Br | 6.70E+07 | 79.9040 | 8.39E+05 | 840 | µmol/kg | 130,000,000 |
36 | Kr | 3.10E+02 | 83.8000 | 3.70E+00 | 3.7 | nmol/kg | |
37 | Rb | 1.20E+05 | 85.4678 | 1.40E+03 | 1.4 | µmol/kg | 3,000,000 |
38 | Sr | 7.80E+06 | 87.6200 | 8.90E+04 | 89 | µmol/kg | 5,100,000 |
39 | Y | 1.70E+01 | 88.9059 | 1.91E-01 | 190 | pmol/kg | 5,100 |
40 | Zr | 1.50E+01 | 91.2240 | 1.64E-01 | 160 | pmol/kg | 5,600 |
41 | Nb | 5.00E+00 | 92.9064 | 5.38E-02 | 3.8 | pmol/kg | |
42 | Mo | 1.00E+04 | 95.9400 | 1.04E+02 | 100 | nmol/kg | 760,000 |
43 | Tc | xxx | xxx | xxx | xxx | xxx | xxx |
44 | Ru | 5.00E-03 | 101.0700 | 4.95E-05 | <49 | fmol/kg | |
45 | Rh | 8.00E-02 | 102.9055 | 7.77E-04 | 780 | fmol/kg | |
46 | Pd | 6.00E-02 | 106.4200 | 5.64E-04 | 560 | fmol/kg | 10,000 |
47 | Ag | 2.00E+00 | 107.8680 | 1.85E-02 | 18 | pmol/kg | |
48 | Cd | 7.00E+01 | 112.4100 | 6.23E-01 | 620 | pmol/kg | 50,000 |
49 | In | 1.00E-02 | 114.8200 | 8.71E-05 | 87 | fmol/kg | 100 |
50 | Sn | 5.00E-01 | 118.7100 | 4.21E-03 | 4.2 | pmol/kg | 4 |
51 | Sb | 2.00E+02 | 121.7570 | 1.64E+00 | 1.6 | nmol/kg | 5,700 |
52 | Te | 7.00E-02 | 127.6000 | 5.49E-04 | 550 | fmol/kg | 100 |
53 | I | 5.80E+04 | 126.9045 | 4.57E+02 | 460 | nmol/kg | 340,000 |
54 | Xe | 6.60E+01 | 131.2900 | 5.03E-01 | 500 | pmol/kg | |
55 | Cs | 3.06E+02 | 132.9054 | 2.30E+00 | 2.3 | nmol/kg | 330,000 |
56 | Ba | 1.50E+04 | 137.3300 | 1.09E+02 | 109 | nmol/kg | 10,000 |
57 | La | 5.60E+00 | 138.9055 | 4.03E-02 | 40 | pmol/kg | 1,000 |
58 | Ce | 7.00E-01 | 140.1200 | 5.00E-03 | 5 | pmol/kg | 100 |
59 | Pr | 7.00E-01 | 140.9077 | 4.97E-03 | 5 | pmol/kg | 500 |
60 | Nd | 3.30E+00 | 144.2400 | 2.29E-02 | 23 | pmol/kg | 600 |
61 | Pm | xxx | xxx | xxx | xxx | xxx | xxx |
62 | Sm | 5.70E-01 | 150.3600 | 3.79E-03 | 3.8 | pmol/kg | 700 |
63 | Eu | 1.70E-01 | 151.9650 | 1.12E-03 | 1.1 | pmol/kg | 600 |
64 | Gd | 9.00E-01 | 157.2500 | 5.72E-03 | 5.7 | pmol/kg | 800 |
65 | Tb | 1.70E-01 | 158.9253 | 1.07E-03 | 1.1 | pmol/kg | 800 |
66 | Dy | 1.10E+00 | 162.5000 | 6.77E-03 | 6.8 | pmol/kg | 1,000 |
67 | Ho | 3.60E-01 | 164.9303 | 2.18E-03 | 2.2 | pmol/kg | 2,700 |
68 | Er | 1.20E+00 | 167.2600 | 7.17E-03 | 7.2 | pmol/kg | 2,700 |
69 | Tm | 2.00E-01 | 168.9342 | 1.18E-03 | 1.2 | pmol/kg | 5,000 |
70 | Yb | 1.20E+00 | 173.0400 | 6.93E-03 | 6.9 | pmol/kg | 2,200 |
71 | Lu | 2.30E-01 | 174.9670 | 1.31E-03 | 1.3 | pmol/kg | 6,200 |
72 | Hf | 3.40E+00 | 178.4900 | 1.90E-02 | 0.71 | pmol/kg | 1,300 |
73 | Ta | 2.50E+00 | 180.9479 | 1.38E-02 | 0.2 | pmol/kg | |
74 | W | 1.00E+01 | 183.8500 | 5.44E-02 | 54 | pmol/kg | 61,000 |
75 | Re | 7.80E+00 | 186.2070 | 4.19E-02 | 41 | pmol/kg | |
76 | Os | 2.00E-03 | 190.2000 | 1.05E-05 | 56 | fmol/kg | 40,000 |
77 | Ir | 1.30E-04 | 192.2200 | 6.76E-07 | 680 | amol/kg | 2,000 |
78 | Pt | 5.00E-02 | 195.0800 | 2.56E-04 | 250 | fmol/kg | |
79 | Au | 9.85E-03 | 196.9665 | 5.00E-05 | 50 | fmol/kg | 380 |
80 | Hg | 1.40E-01 | 200.5900 | 6.98E-04 | 700 | fmol/kg | 350 |
81 | Tl | 1.30E+01 | 204.3830 | 6.36E-02 | 64 | pmol/kg | |
82 | Pb | 2.70E+00 | 207.2000 | 1.30E-02 | 13 | pmol/kg | 80 |
83 | Bi | 3.00E-02 | 208.9804 | 1.44E-04 | 140 | fmol/kg | |
84 | Po | xxx | xxx | 3.00E-11 | 30 | zmol/kg | 100 |
85 | At | xxx | xxx | xxx | xxx | xxx | xxx |
86 | Rn | xxx | xxx | 3.00E-12 | 3 | zmol/kg | 0.01 |
87 | Fr | xxx | xxx | xxx | xxx | xxx | xxx |
88 | Ra | 1.30E-04 | 226.0254 | 5.75E-07 | 580 | amol/kg | |
89 | Ac | xxx | xxx | 2.00E-11 | 20 | zmol/kg | |
90 | Th | 2.00E-02 | 232.0381 | 8.62E-05 | 90 | fmol/kg | 45 |
91 | Pa | xxx | 231.0359 | 1.80E-08 | 18 | amol/kg | 200 |
92 | U | 3.20E+03 | 238.0290 | 1.34E+01 | 13.4 | nmol/kg | 400,000 |