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

Conc.

Conc.

Conc

    yrs

ng/kg

g/mol

nmol/kg

Rational Units

1

H+

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

Ámol/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

Ámol/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

Ámol/kg

7

NO3

4.20E+05

14.0067

3.00E+04

30

Ámol/kg

3,000

8

O2

2.80E+06

15.9994

1.75E+05

175

Ámol/kg

9

F

1.30E+06

18.9984

6.84E+04

68

Ámol/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

Ámol/kg

20,000

15

PO4

6.20E+04

30.9738

2.00E+03

2

Ámol/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

Ámol/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

Ámol/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

Ámol/kg

3,000,000

38

Sr

7.80E+06

87.6200

8.90E+04

89

Ámol/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

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

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

3.00E-11

30

zmol/kg

100

85

At

86

Rn

3.00E-12

3

zmol/kg

0.01

87

Fr

88

Ra

1.30E-04

226.0254

5.75E-07

580

amol/kg

89

Ac

2.00E-11

20

zmol/kg

90

Th

2.00E-02

232.0381

8.62E-05

90

fmol/kg

45

91

Pa

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