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Acidification with nitric acid improves chemical characteristics and reduces phytotoxicity of alkaline chars

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Acidification with nitric acid improves chemical characteristics and reduces phytotoxicity of alkaline chars

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dc.contributor.author Fornes Sebastiá, Fernando es_ES
dc.contributor.author Belda Navarro, Rosa María es_ES
dc.date.accessioned 2018-09-10T09:20:45Z
dc.date.available 2018-09-10T09:20:45Z
dc.date.issued 2017 es_ES
dc.identifier.issn 0301-4797 es_ES
dc.identifier.uri http://hdl.handle.net/10251/106865
dc.description.abstract [EN] Charred organic matter is recently receiving attention for its potential use as soilless growth medium. However, depending on its origin and on the manufacturing technology, it can result toxic for plants. This fact implies that a detoxifying treatment ought to be devised in order to reclaim char in this way. We have studied three materials which combine these factors: two pyrolyzed biochars, one from forest waste (BCH-FW) and another from olive mill waste (BCH-OMW), and one hydrothermally carbonized hydrochar from forest waste (HYD-FW). These materials are suspicious of phytotoxicity due to their high pH, high salinity, or presence of organic toxics. For these new materials, it is mandatory to select fast and reliable bioassays to predict their potential phytotoxicity. In order to achieve this goal water extracts of the three chars were subjected to bioassays of seed germination and bioassays of seedling growth in hydroponic conditions. The biochar from olive mill waste and the hydrochar, but not the biochar from forest waste, showed considerable phytotoxicity as seed germination and plant growth were negatively affected (e.g. BCH-OMW reduced seed germination by 80% and caused early seedling death). In order to adjust pH and electrical conductivity for plant growth, treatments of acidification and salt leaching with optimal diluted HNO3 solutions (03 N, 0.2 N, and 0.75 N for BCH-OMW, BCH-FW, and HYD-FW, respectively) as calculated from titration curves, were conducted. The acid treatment reduced electrical conductivity in BCH-OMW (from 9.2 to 4.5 dS m(-1)), pH (maximum in BCH-FW from 9.6 to 6.2) and water soluble carbonaceous compounds (maximum in HYD-FW from 5969 to 2145 mg kg(-1)) in the three chars, and increased N content (maximum in BCH-OMW from 50 to 6342 mg kg(-1)) in the three chars. Bioassays on acid-treated chars demonstrated the absence of phytotoxicity and even stimulation of seedling growth over the control (increase of 86% and 56% for BCH-FW and HYD-FW, respectively). We conclude that acidification of chars with diluted HNO3 is a viable technique to conform chars to standards for plant growth purposes. (C) 2017 Elsevier Ltd. All rights reserved. es_ES
dc.description.sponsorship This study was funded by the Universitat Politecnica de Val encia (SP20120433-PAID-05-12) (Proyectos de nuevas Líneas de Investigacion Multidisciplinares; PAID-05-12). We thank INGELIA S.L. for giving us the hydrochar for free.This study was funded by the Universitat Politecnica de Val encia (SP20120433-PAID-05-12) (Proyectos de nuevas Líneas de Investigacion Multidisciplinares; PAID-05-12). We thank INGELIA S.L. for giving us the hydrochar for free.
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation UPV-VIN/SP20120433 es_ES
dc.relation.ispartof Journal of Environmental Management es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Acidification es_ES
dc.subject Biochar es_ES
dc.subject Hydrochar es_ES
dc.subject Phytotoxicity es_ES
dc.subject Salt leaching es_ES
dc.subject Soilless growth media es_ES
dc.subject.classification FISIOLOGIA VEGETAL es_ES
dc.subject.classification BIOLOGIA VEGETAL es_ES
dc.title Acidification with nitric acid improves chemical characteristics and reduces phytotoxicity of alkaline chars es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.jenvman.2017.01.026 es_ES
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Producción Vegetal - Departament de Producció Vegetal es_ES
dc.description.bibliographicCitation Fornes Sebastiá, F.; Belda Navarro, RM. (2017). Acidification with nitric acid improves chemical characteristics and reduces phytotoxicity of alkaline chars. Journal of Environmental Management. 191:237-243. doi:10.1016/j.jenvman.2017.01.026 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.1016/j.jenvman.2017.01.026 es_ES
dc.description.upvformatpinicio 237 es_ES
dc.description.upvformatpfin 243 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 191 es_ES
dc.identifier.pmid 28110257
dc.relation.pasarela S\329036 es_ES
dc.contributor.funder Universitat Politècnica de València es_ES


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