Mineral Makeup of Seawater

In order of most to least:

Element Molecular Weight PPM in Seawater Molar Concentration
Chloride 35.4 18980 0.536158
Sodium 23 10561 0.459174
Magnesium 24.3 1272 0.052346
Sulfur 32 884 0.027625
Calcium 40 400 0.01
Potassium 39.1 380 0.009719
Bromine 79.9 65 0.000814
Carbon(inorganic) 12 28 0.002333
Strontium 87.6 13 0.000148
Boron 10.8 4.6 0.000426
Silicon 28.1 4 0.000142
Carbon (organic) 12 3 0.00025
Aluminum 27 1.9 0.00007
Fluorine 19 1.4 0.000074
N as nitrate 14 0.7 0.00005
Nitrogen (organic) 14 0.2 0.000014
Rubidium 85 0.2 0.0000024
Lithium 6.9 0.1 0.000015
P as Phosphate 31 0.1 0.0000032
Copper 63.5 0.09 0.0000014
Barium 137 0.05 0.00000037
Iodine 126.9 0.05 0.00000039
N as nitrite 14 0.05 0.0000036
N as ammonia 14 0.05 0.0000036
Arsenic 74.9 0.024 0.00000032
Iron 55.8 0.02 0.00000036
P as organic 31 0.016 0.00000052
Zinc 65.4 0.014 0.00000021
Manganese 54.9 0.01 0.00000018
Lead 207.2 0.005 0.000000024
Selenium 79 0.004 0.000000051
Tin 118.7 0.003 0.000000025
Cesium 132.9 0.002 0.000000015
Molybdenum 95.9 0.002 0.000000021
Uranium 238 0.0016 0.0000000067
Gallium 69.7 0.0005 0.0000000072
Nickel 58.7 0.0005 0.0000000085
Thorium 232 0.0005 0.0000000022
Cerium 140 0.0004 0.0000000029
Vanadium 50.9 0.0003 0.0000000059
Lanthanum 139.9 0.0003 0.0000000022
Yttrium 88.9 0.0003 0.0000000034
Mercury 200.6 0.0003 0.0000000015
Silver 107.9 0.0003 0.0000000028
Bismuth 209 0.0002 0.00000000096
Cobalt 58.9 0.0001 0.0000000017
Gold 197 0.000008 0.00000000004