Hydrothermally-altered feldspar reduces metal toxicity and promotes plant growth in highly metal-contaminated soils.

Autor: Ribeiro PG; Federal University of Lavras, Department of Soil Science, School of Agriculture, Lavras, Minas Gerais, Brazil., Aragão OODS; Instituto Federal do Pará, Campus Breves, Pará, Brazil., Martins GC; Instituto Tecnológico Vale, Rua Boaventura da Silva, 955, 66055-090, Belém, Pará, Brazil., Rodrigues M; APT - Advanced Potash Technologies Ltd., 89 Nexus Way, Grand Cayman, KY1-9007, Cayman Islands., Souza JMP; Federal University of Lavras, Department of Soil Science, School of Agriculture, Lavras, Minas Gerais, Brazil., Moreira FMS; Federal University of Lavras, Department of Soil Science, School of Agriculture, Lavras, Minas Gerais, Brazil., Li YC; Department of Soil and Water Sciences, Tropical Research and Education Center, IFAS, University of Florida, Homestead, FL, 33031, USA., Guilherme LRG; Federal University of Lavras, Department of Soil Science, School of Agriculture, Lavras, Minas Gerais, Brazil. Electronic address: guilherm@ufla.br.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2022 Jan; Vol. 286 (Pt 2), pp. 131768. Date of Electronic Publication: 2021 Aug 04.
DOI: 10.1016/j.chemosphere.2021.131768
Abstrakt: Novel green technologies for soil remediation have been focusing on altering soil properties and improving soil health. Hydrothermally-altered feldspar (HYP, HydroPotash), recently developed, is being related as both an efficient amendment to immobilize heavy metals in soils and a plant nutrients source, consisting in a promising technology for revegetation of contaminated sites. In order to evaluate the effectiveness of using HYP for phytostabilization programs, two different soils (Technosol and Oxisol) collected from a smelting site were amended with increasing doses of HYPs (HYP-1 and HYP-2): 15, 30, 60, and 120 Mg ha -1 . For comparison, a control (soil without amendment) and a soil amended with zeolite (clinoptilolite) were also included as treatments. After 90 days of incubation, HYPs decreased up to 83.8 % of Cd availability and reduced exchangeable Al up to 100 %. HydroPotash increased pH, cation exchange capacity, and contents of potassium, calcium, and phosphorus, as well as microbial biomass carbon, and fluorescein diacetate hydrolysis of soils. Andropogon gayanus, Eucalyptus grandis, and Heterocondylus vitalbae started growing from the dose of 15 Mg ha -1 HYPs in the Oxisol and 60 Mg ha -1 HYPs in the Technosol. Principal component analysis indicates that plant shoot dry weight was negatively correlated with extractable Cd and Zn and positively with pH, CEC, and Ca content. Besides promoting plant growth, HYPs reduced heavy metals (Cd and Zn) absorption by plants, indicating that HYP has potential use as an amendment in phytostabilization programs.
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Databáze: MEDLINE
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