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Stabilising metal(loid)s in soil with iron and aluminium-based products: microbial, biochemical and plant growth impact

Garau, Giovanni and Silvetti, Margherita and Castaldi, Paola and Mele, Elena and Deiana, Pietrino and Deiana, Salvatore Andrea (2014) Stabilising metal(loid)s in soil with iron and aluminium-based products: microbial, biochemical and plant growth impact. Journal of environmental management, Vol. 139 , p. 146-153. ISSN 0301-4797. eISSN 1095-8630. Article.

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DOI: 10.1016/j.jenvman.2014.02.024

Abstract

Four iron and aluminium-based products, including red mud (RM), hematite (Fe2O3), an iron-rich water treatment residual (Fe-WTR) and amorphous Al hydroxide (Al-OH), were evaluated for their effectiveness at stabilising As and heavy metals (i.e. Cd, Cu, Pb, Zn) in a circumneutral contaminated soil [As (2105 mg kg−1), Cd (18 mg kg−1), Cu (264 mg kg−1), Pb (710 mg kg−1), Zn (522 mg kg−1)]. Treatment impacts on soil microbial and biochemical features (i.e. microbial biomass-C, microbial counts, 16S rRNA PCR-TTGE of culturable bacteria, dehydrogenase, urease and β-glucosidase activity, Biolog derived parameters-AWCD and richness) as well as bean (Phaseolus vulgaris) and wheat (Triticum vulgare) growth were also assessed.
After 6 months equilibration, all the amendments (application rate 3% w/w) but RM reduced labile As while only Al-OH reduced the concentration of water-soluble heavy metals. Despite the highest bioavailability of contaminants, most of the soil microbial and biochemical features monitored (i.e. microbial biomass-C, total bacterial counts, dehydrogenase activity and AWCD) were significantly higher in the RM-soil. Bean germination was completely inhibited in RM-soil while wheat growth was similar to that of the control. The Al-OH treatment was best overall, promoting microbial abundance, diversity and activity while increasing bean and wheat growth and reducing As accumulated in plant shoots. Results suggest that Al-OH is a suitable candidate for field evaluations while the use of RM in the remediation of circumneutral or subalkaline contaminated soils should be reconsidered.

Item Type:Article
ID Code:9702
Status:Published
Refereed:Yes
Uncontrolled Keywords:Arsenic-polluted soil, iron and aluminium-based products, sequential extraction, soil microbial community, soil enzyme activity, plant growth
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0301-4797
eISSN:1095-8630
Deposited On:04 Apr 2014 09:16

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