titoli, abstracts, parole chiave >>>
Long-term influence of red mud on As mobility and soil physico-chemical and microbial parameters in a polluted sub-acidic soil

Garau, Giovanni and Silvetti, Margherita and Deiana, Salvatore Andrea and Deiana, Pietrino and Castaldi, Paola (2011) Long-term influence of red mud on As mobility and soil physico-chemical and microbial parameters in a polluted sub-acidic soil. Journal of Hazardous Materials, Vol. 185 (2-3), p. 1241-1248. eISSN 1873-3336. Article.

Full text not available from this repository.

DOI: 10.1016/j.jhazmat.2010.10.037

Abstract

In this study we evaluated the efficiency of red muds (RM, a bauxite residue) to immobilize the arsenic present in a polluted sub-acidic soil (UP-soil; total As 2428 mg kg−1) and to influence some chemical, biochemical and microbiological properties after 2 years since RM addition. The RM addition caused a pH increase, a striking decrease of total organic carbon and a significant increase of water-soluble C, N and P. The analysis of As mobility through sequential extraction showed a reduction of the water-soluble arsenic in the RM-soil compared to the UP-soil (3.44% and 5.59% of the total As respectively) and a remarkable increase of the residual (non extractable) arsenic fraction in the RM-soil (>300% compared to UP-soil). RM addition increased significantly the microbial abundance and the activity of selected enzymes (dehydrogenase, urease) with respect to UP-soil while had a major influence on the structure of soil microbial communities as evaluated by the Biolog Community Level Physiological Profile. The reduced As mobility, together with an increase of C, N and P labile-pool (likely originating from a “de-structuring effect” of RM on the soil organic matter) were identified as the key factors affecting the biological activity in the RM-treated soil.

Item Type:Article
ID Code:5494
Status:Published
Refereed:Yes
Uncontrolled Keywords:Arsenic-polluted soil, red mud, culturable microorganisms, enzymatic activities, community level physiological profile
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 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier
eISSN:1873-3336
Copyright Holders:© 2010 Elsevier
Deposited On:04 Mar 2011 16:28

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page