Mobility of Pb, Zn, Ba, As and Cd toward soil pore water and plants (willow and ryegrass) from a mine soil amended with biochar

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:232

Article

Norini, Marie-Paule¹  Thouin, Hugues¹  Miard, Florie³  Battaglia-Brunet, Fabienne^1,2  Gautret, Pascale¹  Guegan, Regis¹  Le Forestier, Lydie¹  Morabito, Domenico³  Bourgerie, Sylvain³  Motelica-Heino, Mikael¹ 

[1] Univ Orleans, CNRS, BRGM, ISTO,UMR 7327, F-45071 Orleans, France

[2] Bur Rech Geol & Minieres, BP 36009, F-45060 Orleans 2, France

[3] Univ Orleans, INRA USC1328, LBLGC EA1207, F-45067 Orleans, France

关键词: Metals;    Mine soil;    Blochar;    Willow;    Ryegrass;    Soil pore water;   

DOI  :  10.1016/j.jenvman.2018.11.021

来源: Elsevier

【 摘 要 】

Mine soils often contain metal(loid)s that may lead to serious environmental problems. Phytoremediation, consisting in covering the soil with specific plants with the possible addition of amendments, represents an interesting way of enhancing the quality of mine soils by retaining contaminants and reducing soil erosion. In order to study the effect of an assisted phytoremediation (with willow and ryegrass) on the properties of soil pore water (SPW), we investigated the impact of amendment with biochar (BC) combined with the planting of willow and ryegrass on the behavior of several metal(loid)s (Pb, Zn, Ba, As, and Cd) in a mine soil. Data on the physicochemical parameters and concentrations of the different metal(loid)s in both SPW and in plant tissues of willow and ryegrass highlight the importance of BC for SPW properties in terms of reductions in soluble concentrations of Pb and Zn, although there was no effect on the behavior of As and Cd. BC also increased soluble concentrations of Ba, probably related to ion release by the BC. By improving major ions available in mine soil, BC improved the lifetime of plants and enhanced their growth. Plant development did not appear to significantly affect the physicochemical parameters of SPW. Willow and ryegrass growing on soil with BC incorporated Cd and Ba into their tissues. The influence of plants on the behavior of metal(loid)s was noticeable only for ryegrass growing in soil with 2% BC, where it modified the behavior of Pb and Ba.

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