Using geophysics to locate elevated soil zinc and natural organic matter to influence metal bioavailability

Rebekah Brosky-Dorsey, James Cull, Antonio F. Patti

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Conductivity and chargeability data, obtained in the field by Time-Domain Induced Polarisation (TDIP), were employed as a non-invasive means of determining elevated soil zinc concentrations. A comparison of chargeability data with zinc concentration data, obtained by total soil digestion in the laboratory, showed soil with high chargeability were soils which also had elevated soil zinc concentrations (300 to 4, 750 mg/kg soil). Glasshouse phytoremediation experiments were conducted on these soils, as well as on lateritic soils with high nickel concentrations (2,250 to 4,000 mg/kg soil), in order to determine if natural organic amendments increased phytoextraction potential and biomass production of Lolium perenne. Zinc and nickel were shown to be extracted from the amended soils and accumulated into the aboveground parts of ryegrass in concentrations less than that of unamended control soils. In fact, the organic amendments decreased bioavailability of the metals. A plot of leaf dry weight versus leaf metal concentration showed the bioavailability of zinc and nickel to be lowest after the addition of Colac Peat.

Original languageEnglish
Title of host publicationProceedings of the Second IASTED International Conference on Advanced Technology in the Environmental Field, ATEF 2006
Pages218-221
Number of pages4
Publication statusPublished - 1 Dec 2007
Event2nd IASTED International Conference on Advanced Technology in the Environmental Field, ATEF 2006 - Lanzarote, Canary Islands, Spain
Duration: 6 Feb 20068 Feb 2006

Publication series

NameProceedings of the Second IASTED International Conference on Advanced Technology in the Environmental Field, ATEF 2006

Conference

Conference2nd IASTED International Conference on Advanced Technology in the Environmental Field, ATEF 2006
CountrySpain
CityLanzarote, Canary Islands
Period6/02/068/02/06

Keywords

  • Induced polarisation
  • Nickel
  • Organic amendments
  • Phytoremediation
  • Zinc

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