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Temporal variability of colloidal material in agricultural storm runoff from managed grassland using flow field-flow fractionation
Authors:Laura J Gimbert  Paul J Worsfold
Institution:School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UK
Abstract:This paper reports the use of flow field-flow fractionation (FlFFF) to determine the temporal variability of colloidal (<1 μm) particle size distributions in agricultural runoff waters in a small managed catchment in SW England during storm events. Three storm events of varying intensity were captured and the colloidal material in the runoff analysed by FlFFF. The technique had sufficient sensitivity to determine directly the changing colloidal profile over the 0.08–1.0 μm size range in the runoff waters during these storm events. Rainfall, total phosphorus and suspended solids in the bulk runoff samples were also determined throughout one storm and showed significant correlation (P < 0.01) with the amount of colloidal material. Whilst there are some uncertainties in the resolution and absolute calibration of the FlFFF profiles, the technique has considerable potential for the quantification of colloidal material in storm runoff waters.
Keywords:Flow field-flow fractionation  Colloidal material  Agricultural runoff  Managed grassland
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