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Title: Development and use of a multi-colour tracer technique to investigate colloid facilitated transport through unsaturated vadose zone soil
Author: Sinclair, Hazel Anne
ISNI:       0000 0004 0135 5153
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2011
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A novel multi-coloured method for tracing several different sizes of colloid at once was developed using fluorescently dyed latex polystyrene microspheres and employing a solvent dissolution method (SDM) developed from that used in bio-medical research for the detection of these tracers. The use of this method means that both the breakthrough characteristics, and colloidal mobilisation and deposition patterns within the soil profile, can be investigated as it allows detection of the micro sphere tracers in both water and soil samples. A series of laboratory based rainfall simulation experiments carried out on a four large intact soil cores showed that the four sizes of fluorescent microsphere used in this research (1.2Ilm, O.8Ilm, OAllm and O.2Ilm) could mimic the behaviour of the corresponding size fractions of both TP and MRP extremely successfully, though the correlation was stronger for TP. These experiments also showed that the colloidal and colloid-borne P could make a significant contribution to phosphorus losses from agricultural soils. Further, a high proportion of all four size fractions were found to be molybdate reactive, indicating that current water quality monitoring which uses MRP
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available