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作 者:Hussein Jaafar Kanbar Zeinab Matar Ghina Abed-AlHadi Safa Veronique Kazpard
机构地区:[1]Research and Aralysis Platform for Enuironmental Sciences(PRASE),Doctoral School of Sciences and Techrology(EDST),The Lebanese University,P.O.5,Rafic Hariri Campus,Hadat,Lebanon [2]Department of Chemistry,UmeàUniversity,SE-90187,Umeà,Sweden [3]Department of Earth and Life Sciences,Faculty of Sciences,The Lebanese University,Rafic Hariri Campus,Hadat,Lebanon [4]Laboratory of Georesources,Geosciences and Enuironment(1.2GE),Faculty of Sciences,The Lebanese University,Fanar,Lebanon
出 处:《Journal of Environmental Sciences》2020年第10期85-92,共8页环境科学学报(英文版)
基 金:financed by the research grant programs of the Lebanese University (le projet est soutenu par le programme de subvention de la recherche scientifique à l’Université Libanaise)。
摘 要:This study focused on metal release from technosols induced by synthetic root exudate(SRE).The effect of SRE composition on metal release was studied using six technosols.This was done by treating the technosols with SRE solutions having varying concentrations of low molecular weight organic acids (LMWOAs),namely oxalic,citric,and malic acids.Consequently,the physico-chemical parameters (p H and electric conductivity),Ca,Mg,Fe,Zn,and Cu release (by atomic absorption spectroscopy,AAS),chemical changes (by Fourier transform infrared,FT-IR),and organic parameters (by fluorescence) were investigated.Metal release showed to be dependent on the SRE composition and technosol characteristics.Citric acid selectively released Ca,Mg,Zn,and Cu from technosols in a concentration-dependent manner;oxalic acid showed a significant role in the release of Mg and Fe.Under relatively high LMWOA concentrations,particulate organo-mineral complexes precipitated.Additionally,technosol weathering was seen by the dissolution of humic substances and ferriallophanes,which in turn caused metal release.However,re-precipitation of these phases showed to re-sorb metals,thus underestimating the role of LMWOAs in metal release.Therefore,the selective metal leaching was highly dependent on the SRE composition and LMWOA concentrations on one hand,and on the mineral,organic,and organo-mineral components of the technosols on the other.The understanding of such processes is crucial for proposing and implementing environmental management strategies to reduce metal leaching or for the beneficial re-usage of metals (e.g.,for agromining) from technosols.
关 键 词:Technosols Oxalic acid Citric acid METALS DESORPTION Organo-mineral complexes
分 类 号:TF803.21[冶金工程—有色金属冶金]
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