Metal

Sea Water

Nile River

Typical Sea Water*

Measured

Chloride (Cl⁻)

18.980

20.30

25.2

Sodium (Na⁺)

10.556

12.200

1.6

Sulfate ()

2.649

2.640

17.8

Magnesium (Mg²⁺)

1.262

1.423

15.1

Calcium (Ca²⁺)

400

388

31.2

Potassium (K⁺)

380

453

3.2

Bicarbonate ()

140

-

-

Bromide (Br⁻)

65

125

-

Fluoride (F⁻)

1

-

-

Iodide (I⁻)

<1

-

-