Abstract

CAMPILLO-CORA*, Claudia; ARIAS-ESTEVEZ, Manuel  and  FERNANDEZ-CALVINO, David. The use of Pollution-Induced Community Tolerance (PICT) to Ni to assess the effects of remediation techniques. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.4, pp.891-900.  Epub Dec 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.28648.

The use of remediation techniques in polluted soils with heavy metals is widespread. However, in general, after remediation application, only metal fractions (soluble, bioavailable, et.) are taken into account in the assessment of their efficacy. In this sense, it is also relevant to know the status of soil microorganisms because of the essential functions they perform. In the present study, the effect of three remediation techniques on the development of bacterial community tolerance to Ni was assessed. The selected remediation techniques were: crushed mussel shell (CMS), pine bark (PB), and EDTA. A no-treatment control was also established. CMS was the most effective and least harmful treatment, as the bacterial communities did not develop tolerance in response to Ni additions to the soil. Ni-remediation with CP was only effective for Ni levels of 500 and 1000 mg·kg-1, but bacterial communities developed tolerance to Ni at 2000 mg·kg-1. Washing Ni out of the soil with EDTA was effective in terms of the development of bacterial community tolerance to Ni; however, EDTA-procedure was too harmful to the bacteria, damaging the health of the community.

Keywords : nickel; remediation; bacterial growth; by-products; pollution.

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