Abstract

CABALLERO-MEJIA, Bibiana et al. Phytoremediation with Enterolobium cyclocarpum in tailing sands from informal gold mining contaminated with arsenic and cadmium. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.4, pp.941-950.  Epub Dec 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.28702.

Informal mining poses a risk to ecosystem health. With the aim of restoring the areas affected by this type of activity in a sustainable way, a microcosm trial was carried out for eight months with Enterolobium cyclocarpum, (Jacq.) Griseb. 1960, inoculated with growth-promoting microorganisms in tailings sands from informal mining. This study was carried out in a greenhouse located in the municipality of Buriticá in the department of Antioquia (on the premises of Zijin - Continental Gold). The plant species were planted in 10 L pots, containing approximately 14 kg of tailings sand (A) or tailings sand mixed with organic matter [5% w/w composted poultry manure (A+MO)]. The effect of commercial micro-organisms was tested. Mycorrhizae (0 g or 50 g Mycorfos®), or Rhizobium (0 cm3 or 0.5 cm3 of Rhizobiol® or a mixture of the two at the same doses were added to each pot. In total there were 24 pots. Despite the high levels of total trace elements in the tailings sand (As 269 mg/kg; Cd 461 mg/kg), Enterolobium cyclocarpum adapted to the substrate conditions, with the highest concentration of As and Cd accumulated in the aerial parts of the plants in the mycorrhizal sand treatment. On the other hand, in the treatments without organic amendment that incorporated mycorrhizal fungi, A+M and A+FN+M, the highest concentrations of As and Cd were found in the roots.

Keywords : Phytoremediation; rhizobium; mycorrhiza; Enterolobium cyclocarpum.

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