The nickel phytoextraction potential of some ultramafic soils as determined by sequential extraction
Identifieur interne : 000B80 ( Main/Exploration ); précédent : 000B79; suivant : 000B81The nickel phytoextraction potential of some ultramafic soils as determined by sequential extraction
Auteurs : B. H. Robinson [Nouvelle-Zélande] ; R. R. Brooks [Nouvelle-Zélande] ; P. E. H. Gregg [Nouvelle-Zélande] ; J. H. Kirkman [Nouvelle-Zélande]Source :
- Geoderma [ 0016-7061 ] ; 1999.
Abstract
Sequential extractions at three pH values were used to model the effect of successive harvests of Ni hyperaccumulator plants on the Ni availability of several ultramafic soils. All soils, with one exception, contained about 2000 μg/g Ni and all behaved in a similar manner. It was found that between 13 and 80% of the total Ni in the soil was potentially available to plants. The remainder could not be removed even after a large number of theoretical hyperaccumulator harvests. This necessarily limits the soils' potential for phytoremediation and phytomining. The concentration of residual soluble Ni after several extractions could be predicted mathematically. As it has been shown that the Ni concentration in hyperaccumulator plants is related to the soluble Ni fraction in the soils, an estimate was made on how many economic harvests of Ni could be obtained from each soil. It was found that between three (Dun Mountain, New Zealand) and 18 (Kouaoua, New Caledonia) economic Ni extracts could be obtained before the soil would need to be modified. Similar sequential extractions may be used to determine the bioavailability of other heavy metals in soils that are to be phytoremediated or phytomined.
Url:
DOI: 10.1016/S0016-7061(98)00062-7
Affiliations:
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<front><div type="abstract" xml:lang="en">Sequential extractions at three pH values were used to model the effect of successive harvests of Ni hyperaccumulator plants on the Ni availability of several ultramafic soils. All soils, with one exception, contained about 2000 μg/g Ni and all behaved in a similar manner. It was found that between 13 and 80% of the total Ni in the soil was potentially available to plants. The remainder could not be removed even after a large number of theoretical hyperaccumulator harvests. This necessarily limits the soils' potential for phytoremediation and phytomining. The concentration of residual soluble Ni after several extractions could be predicted mathematically. As it has been shown that the Ni concentration in hyperaccumulator plants is related to the soluble Ni fraction in the soils, an estimate was made on how many economic harvests of Ni could be obtained from each soil. It was found that between three (Dun Mountain, New Zealand) and 18 (Kouaoua, New Caledonia) economic Ni extracts could be obtained before the soil would need to be modified. Similar sequential extractions may be used to determine the bioavailability of other heavy metals in soils that are to be phytoremediated or phytomined.</div>
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