Physical and geochemical characteristics of suspended solids, Wilton Creek, Ontario

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Abstract
To understand the nature of sediment-associated nutrient and contaminant transport dynamics in fluvial systems, a stormflow sampling program of suspended solids is reported for 1 water year in a representative rural diffuse source catchment of sourtheastern Ontario. Bulk samples of subsieve solids were obtained using a field-portable continuous-flow centrifuge apparatus. The physical and geochemical properties of suspended solids show no significant intersite differences over reaches of 1500-2000 m, yet display distinctive seasonal trends. Systematic seasonal changes in particle size, organic content and Ca, P, Mn, Al, Ti, Fe and K appear to reflect the changing role of partial area hydrology. Ca, P and Mn are bioaccumulated by stream algae. Mineral signature is relatively constant over the year.