Summary Table

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	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
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