Abstract
Rain- and river-water samples were collected for one year in the Salgado River basin, a semi-arid region in Bahia State, Brazil. Total dissolved solids (TDS) concentrations, and Na, Ca, K, Mg and U contents were measured in these samples and also in rock and soil samples of the basin. A geochemical balance and the chemical weathering rate of rocks were determined from these results. The water of Salgado River showed high concentrations of TDS (1.42 g l −1) and cations; thus it was impossible to determine the chemical weathering rate of rocks by using these major cations as indicator elements. A rate of 36 t km −2 yr. −1 was obtained by using uranium as a natural tracer. Salgado River water belongs to the most abundant group of surface waters found in northeastern Brazil, that is, salty waters with high NaCl concentrations.
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