Variations in suspended sediment and associated trace element concentrations in selected riverine cross sections

min) spatial and/or temporal variations in suspended-sediment concentrations. Despite this, major element concentrations are remarkably stable both spa- tially and temporally. Trace element concentrations are generally stable; however, some spatial and temporal variations may occur. Introduction The role of suspended sediment in the biological and geochemical cycling of trace elements in fluvial systems is well established (e.g., refs 1 and