The mystery surrounding high concentrations of Cr(III) in plants has been uncovered. It is attributed to the presence of low molecular weight
organic acids (LMWOA) in soil in which the plants are growing. Apart from that, the factors influencing solubility of Cr(VI) in soil have also
been investigated. It was found that the solubility of Cr(VI) species is governed by the presence of CO3
2− ions in a soil solution that resulted when
atmospheric CO2 dissolves in soil–water.
Concentrations of Cr(VI) and Cr(III) were determined in plants, collected on unpolluted soils in different geographical areas. It was found
that the concentration of Cr(VI) in plants correlated with the soluble fraction of Cr(VI) in soil, while Cr(III) concentration in plants is limited by
concentration LMWOA in soil. It can therefore be concluded that the high level of Cr(III) in plants is also due to the direct absorptions of the
species from soil rich in organic acids.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1000802 |
| Date | 20 July 2007 |
| Creators | Mandiwana, KL, Panichev, N, Kataeva, M, Siebert, S |
| Publisher | Elsevier |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | © 2007 Elsevier B.V. |
| Relation | Journal of Hazardous Materials |
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