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Differences in metal concentration in conventional and organic arable soils and the influence of soil parameters
Örebro University, School of Science and Technology.
2017 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Heavy metal contamination of arable soil is a worldwide environmental problem affecting human health. Different farming techniques could influence the concentration of nutrients and toxic metals in the soil. In this study, soil samples from conventional and organic farms were studied by quantitative determination of acid- and water-extracted metals to determine differences between farming techniques. Top- and subsoil samples were collected in two conventional and two organic farms in Örebro County. In addition to element analysis, important soil factors, pH, EC, LOI, DOC, DIC and clay concentration were analysed. Concentration of clay, organic matter and mineral forming elements were highest at one of the conventional sites (site 1) and one of the organic farms (site 4), leading to increased adsorption of macro- and micronutrient elements as well as toxic elements. Water-leachable metal concentration seemed to be affected by soil pH and DOC concentration. Result shows that metal concentrations are mostly affected by soil factors such as clay concentration. For a better understanding of the effect of land use at the conventional and organic sites, metal speciation by sequential leaching could be performed to look at how the metals fractionate among soil particles and a better estimation of bioavailability of the metals.

Place, publisher, year, edition, pages
2017. , p. 40
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:oru:diva-64647OAI: oai:DiVA.org:oru-64647DiVA, id: diva2:1178615
Subject / course
Chemistry
Supervisors
Examiners
Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
  • html
  • text
  • asciidoc
  • rtf