Using artificial fluorescent particles as tracers of livestock wastes within an agricultural catchment

A - Papers appearing in refereed journals

Granger, S. J., Bol, R., Hawkins, J. M. B., White, S. M., Naden, P. S., Old, G. H., Marsh, J. K., Bilotta, G. S., Brazier, R. E., Macleod, C. J. A. and Haygarth, P. M. 2011. Using artificial fluorescent particles as tracers of livestock wastes within an agricultural catchment. Science of the Total Environment. 409, pp. 1095-1103.

AuthorsGranger, S. J., Bol, R., Hawkins, J. M. B., White, S. M., Naden, P. S., Old, G. H., Marsh, J. K., Bilotta, G. S., Brazier, R. E., Macleod, C. J. A. and Haygarth, P. M.
Abstract

Evidence for the movement of agricultural slurry and associated pollutants into surface waters is often anecdotal, particularly with relation to its 'particulate' components which receive less attention than 'bio-vailable' soluble phases. To assess the extent of movement of slurry particles artificial fluorescent particles were mixed with slurry and applied to a field sub-catchment within a headwater catchment. Particles were 2-60 mu m in diameter and two different densities, 2.7 and 1.2 g cm(-3) representing 'inorganic' and 'organic' material. Water samples from the field and catchment outlet were collected during two storm events following slurry application and analysed for particle and suspended sediment concentrations (SSC). SSC from the field and catchment outlet always formed clockwise hysteresis loops indicating sediment exhaustion and particles of the two densities were always found to be positively correlated. Particles from the field formed clockwise hysteresis loops during the first discharge event after slurry application, but anti-clockwise hysteresis loops during the second monitored event which indicated a depletion of readily mobilisable particles. Particles from the catchment outlet always formed anticlockwise hysteresis loops. Particle size became finer spatially, between field and catchment outlet, and temporally, between successive storm events. The results indicate that slurry particles may be readily transported within catchments but that different areas may contribute to pollutant loads long after the main peak in SSC has passed. The density of the particles did not appear to have any effect on particle transport however the size of the particles may play a more important role in the 2-60 mu m range.

KeywordsTracing Particles Animal waste Agricultural catchments Storm events soil-water regimes suspended sediment storm events clay soil phosphorus grassland transport dynamics drainage rainfall
Year of Publication2011
JournalScience of the Total Environment
Journal citation409, pp. 1095-1103
Digital Object Identifier (DOI)doi:10.1016/j.scitotenv.2010.12.005
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeNorth Wyke Research (NWR)
Project: PE 0120
Publisher's version
Output statusPublished
Publisher
Elsevier Science Bv
ISSN0048-9697

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