Thesis

Effect of fertilisers on the availability of potentially toxic elements in soil

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Awarding institution
  • University of Strathclyde
Date of award
  • 2016
Thesis identifier
  • T14370
Person Identifier (Local)
  • 201254261
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Department, School or Faculty
Abstract
  • In this study, soil was amended with several commercial fertilizers and effects on the levels and availabilities of potentially toxic elements (PTE) studied through a series of pot, column leaching, and plant uptake experiment. Analytes (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, U and Zn) were quantified in sample digests, extracts and leachates using inductively coupled plasma mass spectrometry.Commercially-available topsoil was treated with 0, 1, 3 or 5% w/w chicken manure (CM), growmore (GM), phostrogen (PG), rockdust (RD) or seaweed (SW). The CM and GM affected the pseudototal (aqua regia-soluble) PTE concentrations more than the other amendments, whilst application of the BCR sequential extraction provided evidence that both materials could affect the distribution of PTE (especially Cu, U and Zn) in the original soil.Column leaching experiments were performed on an urban soil from West Central Scotland after 2% CM, 5% GM and 2% CM + 5% GM addition. Increased levels of PTE were recovered in leachates of all the amended soils, especially the GM-amended soil, compared with leachates obtained from the control soil. The BCR extraction indicated that Cd, Cr, Fe, Pb, and Zn had been mobilized from the exchangeable phase and that Mn had been transformed from reducible to exchangeable forms.Uptake of PTE by bean plants grown in 2% CM amended soil, and by radish grown in 2% CM, 0.2% GM or 2% CM + 0.2% GM amended soil, were studied. The PTE levels in control bean plant exceeded those in bean plants grown in CM amended soil, and the same trend was observed for radish, suggesting that CM addition can decrease PTE phytoavailability. Addition of growmore resulted in plants with similar PTE burden to control plants. It was found that EDTA-extraction of soil generally overestimated actual plant uptake of PTE.
Advisor / supervisor
  • Davidson, C. M.
  • Nordon, Alison
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