Assisted phytoremediation of a former mine soil using biochar and iron sulphate: Effects on As soil immobilization and accumulation in three Salicaceae species.
Biochar
Iron sulphate
Metal(loid)s
Populus euramericana clone I45/51
Salix purpurea
Salix viminalis
Journal
The Science of the total environment
ISSN: 1879-1026
Titre abrégé: Sci Total Environ
Pays: Netherlands
ID NLM: 0330500
Informations de publication
Date de publication:
25 Mar 2020
25 Mar 2020
Historique:
received:
25
10
2019
revised:
16
12
2019
accepted:
17
12
2019
pubmed:
12
1
2020
medline:
31
3
2020
entrez:
12
1
2020
Statut:
ppublish
Résumé
Metal(loid) accumulation in soils, is of increasing concern because of the potential human health risks. Therefore, metal(loid) contaminated sites need rehabilitation. It is becoming increasingly popular to use phytoremediation methods for the reclamation of sites containing metal(loid)s. However, plant establishment and growth on contaminated soils can be difficult due to high metal(loid) concentrations and poor fertility conditions. Consequently, amendments, like biochar and iron sulphate, must be applied. Biochar, obtained from plant biomass or animal wastes pyrolyzed under minimal oxygen supply, showed beneficial effects on soil properties and plant growth. Iron sulphate can effectively immobilize anions, thus mitigating metal(loid) toxicity and hence promoting plant development. This study aimed to assess the effect of two different modalities of biochar amendment application (top third of the tube and all tube height) combined with iron sulphate addition on the physico-chemical properties of a mining polluted soil and the growth and metal(loid) uptake of three Salicaceae species. A 1.5 year mesocosm experiment under field condition was conducted using a former tin mine contaminated by arsenic, amended with biochar and iron sulphate and vegetated with three Salicaceae species. Results showed that the combination of biochar and iron sulphate improved soil characteristics by increasing pH and electrical conductivity and reducing soil pore water metal(loid) concentrations. Between the two biochar application methods, the addition of biochar on the all tube height showed better results. But for such contaminated soil, biochar, in combination with iron sulphate, had no positive effect on plant growth, for all species tested and especially when incorporating on the top third of the tube. Finally, S. purpurea presented high root metal(loid) concentrations associated to the better growth compared to P. euramericana and S. viminalis, making it a better candidate for phytostabilization of the studied soil.
Identifiants
pubmed: 31926409
pii: S0048-9697(19)36199-6
doi: 10.1016/j.scitotenv.2019.136203
pii:
doi:
Substances chimiques
Soil
0
Soil Pollutants
0
Sulfates
0
biochar
0
Charcoal
16291-96-6
Iron
E1UOL152H7
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
136203Informations de copyright
Copyright © 2019 Elsevier B.V. All rights reserved.