Major Dissolved Constituents of River Water

The total dissolved solids (TDS) content of fresh water is the sum of the concentrations of the dissolved major ions. The world average is about 100 mg L 1 (Table 4.2). Four major cations, Na+, K+, Ca2+, Mg2+, and four major anions, HCO", CO^ , SO4", and Cl", make up most of

TABLE 4.2 Chemical compositions of river waters of the world (mg L 1). Cations and anions are in |ieq L 1. (From Wetzel (2001) and sources therein.)
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