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ThesisUniversity of Iceland>Verkfræði- og náttúruvísindasvið>B.S. verkefni>

Please use this identifier to cite or link to this item: http://hdl.handle.net/1946/10396

Title

The effect of fluoride pollution on soil microorganisms

Published
October 2011
Abstracts
  • The influence of fluoride pollution on soil microorganisms was investigated in an Icelandic Brown Andosol. A laboratory experiment was performed where soil cores were leached with fluoride solutions (NaF) of different concentrations and pH. Chemical analyses were performed on outlet solutions and a high fluoride retention capacity of the soil was detected. The effect of the fluoride pollution was evaluated by measuring microbial biomass carbon and phosphatase activity. Phosphatase activity significantly decreased at a fluoride concentration of 1000ppm, which confirmed the inhibitory effect of fluoride ions on phosphatase enzymes and showed that high fluoride concentrations are toxic for soil microbial communities. The microbial biomass did not show any response to fluoride pollution, which questions the reliability of this parameter in short-term experiments. Retained enzymatic activity due to fluoride pollution indicates that acute fluoride pollutions such as those known to follow some volcanic eruptions might have a negative influence on soil health and fertility.

  • is

    Áhrif flúormengunar á örverur í jarðvegi var rannsökuð í íslenskri eldfjallajörð, brúnjörð. Tilraun inn á rannsóknastofu var framkvæmd þar sem jarðvegskjarnar voru skolaðir með flúorlausnum (NaF) af mismunandi styrk og sýrustigi (pH). Flúor í útskolunarlausnum var efnagreint og þær niðurstöður nýttar til að meta flúorbindingu í jarðvegi. Áhrif mismunandi flúorstyrks á frjósemi jarðvegs var metinn með því að mæla jarðvegslífmassa og virkni fosfatasa í flúorskoluðum jarðvegskjörnum. Virkni fósfatasa var marktækt minni við hæsta flúorstyrkinn,1000 ppm, sem sýnir að hár flúorstyrkur getur hamlað virkni fosfatasa í jarðvegi og þar með minnkað frjósemi hans. Jarðvegslífmassi brást ekki við ábornum flúori á jarðvegskjarna, hvorki 100ppm né 1000ppm, sem bendir til þess að mæling á lífmassa, á stuttum tímaskala þessarar tilraunar, sé ekki ákjósanlegur mælikvarði á áhrif flúormengunar á jarðvegslíf. Minnkandi ensímvirkni við hækkandi flúorstyrk bendir hins vegar til þess að bráð flúormengun, sem fylgir sumum eldgosum, getur haft neikvæð áhrif á heilsu og frjósemi jarðvegs.

Issued Date
20/12/2011


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