[Soil decontamination by plants: possibilities and limits]
1995
Leumann, C.D. | Rammelt, R. | Gupta, S.K. (Eidg. Forschungsanstalt fuer Agrikulturchemie und Umwelthygiene (FAC), Liebefeld-Bern (Switzerland))
Soil decontamination remains a major problem, because up to now there is no technique for removing heavy metals from soil without affecting its fertility. The use of metal-accumulating plants for soil clean-up is being discussed. However, the decontamination time needed nowadays is too long, and means to reach a higher heavy metal uptake by plants are therefore looked for. Beside the selection of appropriate plant species the mobilisation of heavy metals in the soil is suggested as a way to increase plant uptake. Laboratory studies on zinc contaminated soils showed a significant increase of the mobile zinc fraction in the presence of the biodegradable chelating agent NTA. A similar effect was observed at a higher concentration of low-molecular-weight organic substances such as citric, oxalic and salicylic acid
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