Composition of Sea Water

Seawater at 3.5% salinity. ppm = parts per million.

Element	Symbol	ppm	Percentage
Oxygen	H2O	883,000	86.0341%
Hydrogen	H2O	110,000	10.7177%
Chlorine	NaCl	19,400	1.8902%
Sodium	NaCl	10,800	1.0523%
Magnesium	Mg	1,290	0.1257%
Sulfur	S	904	0.0881%
Calcium	Ca	411	0.0400%
Potassium	K	392	0.0382%
Bromine	Br	67	0.0066%
Carbon	C	28	0.0027%
Nitrogen	N	16	0.0015%
Fluorine	F	13	0.0013%
Strontium	Sr	8.1	0.0008%
Boron	B	4.5	0.0004%
Silicon	Si	2.9	0.0003%
Argon	Ar	0.4500000
Lithium	Li	0.1700000
Rubidium	Rb	0.1200000
Phosphorus	P	0.0880000
Iodine	I	0.0640000
Barium	Ba	0.0210000
Molybdenum	Mo	0.0100000
Nickel	Ni	0.0066000
Zinc	Zn	0.0050000
Ferrum	Fe	0.0034000
Uranium	U	0.0033000
Arsenic	As	0.0026000
Vanadium	V	0.0019000
Aluminium	Al	0.0010000
Titanium	Ti	0.0010000
Copper	Cu	0.0009000
Selenium	Se	0.0009000
Stannum	Sn	0.0008100
Manganese	Mn	0.0004000
Cobalt	Co	0.0003900
Antimony	Sb	0.0003300
Cesium	Cs	0.0003000
Argentum	Ag	0.0002800
Krypton	Kr	0.0002100
Chromium	Cr	0.0002000
Mercury	Hg	0.0001500
Neon	Ne	0.0001200
Cadmium	Cd	0.0001100
Germanium	Ge	0.0000600
Xenon	Xe	0.0000470
Gallium	Ga	0.0000300
Lead	Pb	0.0000300
Zirconium	Zr	0.0000260
Bismuth	Bi	0.0000200
Niobium	Nb	0.0000150
Yttrium	Y	0.0000130
Aurum	Au	0.0000110
Rhenium	Re	0.0000084
Hafnium	Hf	0.0000080
Helium	He	0.0000072
Scandium	Sc	0.0000040
Lanthanum	La	0.0000029
Neodymium	Nd	0.0000028
Tantalum	Ta	0.0000025
Europium	Eu	0.0000013
Cerium	Ce	0.0000012
Tungsten	W	0.0000010
Dysprosium	Dy	0.0000009
Erbium	Er	0.0000009
Ytterbium	Yb	0.0000008
Ruthenium	Ru	0.0000007
Gadolinium	Gd	0.0000007
Praesodymium	Pr	0.0000006
Beryllium	Be	0.0000006
Samarium	Sm	0.0000005
Thorium	Th	0.0000004
Holmium	Ho	0.0000002
Thulium	Tm	0.0000002
Lutetium	Lu	0.0000002
Terbium	Tb	0.0000001