Lead phytoextraction from printed circuit computer boards by Lolium perenne L. and Medicago sativa L. |
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| Authors: | María Esther Díaz Martínez Gabriela Sánchez Viveros Alejandro Alarcón Libia Iris Trejo-Téllez |
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| Affiliation: | 1. Posgrado en Ciencias Agropecuarias, Facultad de Ciencias Agrícolas, Universidad Veracruzana. Circuito Gonzalo Aguirre Beltrán s/n, Xalapa, Veracruz, México;2. Microbiología de Suelos and Nutrición Vegetal, Posgrado de Edafología. Colegio de Postgraduados. Carretera México-Texcoco km 36.5. Montecillo, Estado de México |
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| Abstract: | This work assessed the ability of Lolium perenne and Medicago sativa for extracting lead (Pb) from particulate printed circuit computer boards (PCB) mixed in sand with the following concentrations: 0.5, 1.0 and 1.5 g of PCB, and including a control treatment without PCB. The PCB were obtained from computers, and grinded in two particle sizes: 0.0594 mm (PCB1) and 0.0706 mm (PCB2). The PCB particle sizes at their corresponding concentrations were applied to L. perenne and M. sativa by using three experimental assays. In assay II, PCB2 affected the biomass production for both plants. For assay III, the PCB1 increased the biomass of M. sativa (236.5%) and L. perenne (142.2%) when applying either 0.5 or 1.0 g, respectively. In regards to phytoextraction, assay I showed the highest Pb-extraction by roots of L. perenne (4.7%) when exposed to 1.5 g of PCB1. At assay I, L. perenne showed a Pb-bioconcentration factor higher than 1.0 when growing at 0.5 g of PCB1, and when HNO3 was used as digestion solution; moreover, in assay III both plants showed a Pb-translocation factor higher than 1.0. Therefore, Lolium perenne and Medicago sativa are able to recover Pb from electronic wastes (PCB). |
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| Keywords: | Electronic waste translocation bioconcentration |
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