Geochemical balance of some elements in seawater

element potential amount supplied to oceans (g/ton) amount present in seawater (g/ton) percentage in solution

lithium 39 0.17 0.4

boron 2 4.5 250

fluorine 540 1.3 0.2

sodium 16,980 10,800 64

magnesium 12,540 1,290 10

phosphorus 708 0.09 0.01

sulfur 312 904 290

chlorine 188 19,400 10,300

potassium 15,540 392 2.5

calcium 21,780 411 1.9

arsenic 3 0.003 0.1

bromine 0.97 67 6,900

rubidium 186 0.12 0.06

strontium 180 8.1 4.6

iodine 0.18 0.06 33

cesium 4 0.0003 0.008

barium 150 0.02 0.01