Accumulation of heavy metals in native Andean plants: potential tools for soil phytoremediation in Ancash (Peru)

Autor: Vladimir León, Jose Chang Kee, Adelia Torres, Lorena Ramirez, Melissa Corpus, Raúl Loayza-Muro, María J Gonzales, Olga Ponce
Rok vydání: 2017
Předmět:
Soil Pollutants/analysis/pharmacokinetics
purl.org/pe-repo/ocde/ford#3.03.05 [https]
Health
Toxicology and Mutagenesis
Pennisetum clandestinum
Andes
purl.org/pe-repo/ocde/ford#1.05.08 [https]
010501 environmental sciences
01 natural sciences
Plant Roots
Mining
Plant Shoots/drug effects/metabolism
Native plant species
Metals
Heavy
Peru
Environmental Chemistry
Juncus bufonius
Soil Pollutants
Hyperaccumulator
Plant Roots/chemistry/drug effects/metabolism
Environmental Restoration and Remediation
0105 earth and related environmental sciences
Mine tailings
Environmental Restoration and Remediation/methods
biology
Chemistry
04 agricultural and veterinary sciences
General Medicine
Plants
biology.organism_classification
Pollution
Tailings
Phytoremediation
Plants/drug effects/metabolism
Biodegradation
Environmental
Metals
Environmental chemistry
Bioaccumulation
Soil water
040103 agronomy & agriculture
0401 agriculture
forestry
and fisheries
Medicago lupulina
Plant Shoots
Metals
Heavy/analysis/pharmacokinetics
Zdroj: Environmental science and pollution research international. 25(34)
ISSN: 1614-7499
Popis: Metal contamination is a recurring problem in Peru, caused mainly by mine tailings from a past active mining activity. The Ancash region has the largest number of environmental liabilities, which mobilizes high levels of metals and acid drainages into soils and freshwater sources, posing a standing risk on human and environmental health. Native plant species spontaneously growing on naturally acidified soils and acid mine tailings show a unique tolerance to high metal concentrations and are thus potential candidates for soil phytoremediation. However, little is known about their propagation capacity and metal accumulation under controlled conditions. In this study, we aimed at characterizing nine native plant species, previously identified as potential hyperaccumulators, from areas impacted by mine tailings in the Ancash region. Plants were grown on mine soils under greenhouse conditions during 5 months, after which the concentration of Cd, Cu, Ni, Pb, and Zn was analyzed in roots, shoots, and soils. The bioaccumulation (BAF) and translocation factor (TF) were calculated to determine the amount of each metal accumulated in the roots and shoots and to identify which species could be better suited for phytoremediation purposes. Soil samples contained high Cd (6.50-49.80 mg/kg), Cu (159.50-1187.00 mg/kg), Ni (3.50-8.70 mg/kg), Pb (1707.00-4243.00 mg/kg), and Zn (909.00-7100.00 mg/kg) concentrations exceeding national environmental quality standards. After exposure to mine tailings, concentrations of metals in shoots were highest in Werneria nubigena (Cd, 16.68 mg/kg; Cu, 41.36 mg/kg; Ni, 26.85 mg/kg; Zn, 1691.03 mg/kg), Pennisetum clandestinum (Pb, 236.86 mg/kg), and Medicago lupulina (Zn, 1078.10 mg/kg). Metal concentrations in the roots were highest in Juncus bufonius (Cd, 34.34 mg/kg; Cu, 251.07 mg/kg; Ni, 6.60 mg/kg; Pb, 718.44 mg/kg) and M. lupulina (Zn, 2415.73 mg/kg). The greatest BAF was calculated for W. nubigena (Cd, 1.92; Cu, 1.20; Ni, 6.50; Zn, 3.50) and J. bufonius (Ni, 3.02; Zn, 1.30); BCF for Calamagrostis recta (Cd, 1.09; Cu, 1.80; Ni, 1.09), J. bufonius (Cd, 3.91; Cu, 1.79; Ni, 18.36), and Achyrocline alata (Ni, 137; Zn, 1.85); and TF for W. nubigena (Cd, 2.36; Cu, 1.70; Ni, 2.42; Pb, 1.17; Zn, 1.43), A. alata (Cd, 1.14; Pb, 1.94), J. bufonius (Ni, 2.72; Zn, 1.63), and P. clandestinum (Zn, 1.14). Our results suggest that these plant species have a great potential for soil phytoremediation, given their capability to accumulate and transfer metals and their tolerance to highly metal-polluted environments in the Andean region.
Databáze: OpenAIRE
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