Issue |
E3S Web of Conferences
Volume 1, 2013
Proceedings of the 16th International Conference on Heavy Metals in the Environment
|
|
---|---|---|
Article Number | 08008 | |
Number of page(s) | 3 | |
Section | Heavy Metals in Soils II: Loaded Soils | |
DOI | https://doi.org/10.1051/e3sconf/20130108008 | |
Published online | 23 April 2013 |
Study of Cr+6 behavior in three agricultural soils
Department of Agroenvironmental Research, IMIDRA, 28800, Alcalá de Henares, Spain
a ana.elena.pradas@madrid.org
b carmen.lobo@madrid.org
c araceli.perez@madrid.org
Chromium is a heavy metal widely used in industry. Its two most stable oxidation states are Cr+3 and Cr+6. Cr+3 is less soluble and remains adsorbed or precipitated in soils, meanwhile Cr+6 is soluble and also a high toxic specie for living organisms. In natural environments, Cr+3 is the most common specie, but industrial sources of Cr(VI) could cause environmental problems in soils, especially in agricultural systems. To some extent Cr+6 could be reduced to Cr+3 by the action of low pH and organic matter. In order to evaluate the influence of soil characteristics on bioavalability and stability of Cr+6, three different agricultural soils from Madrid region (Spain) were spiked with K2O2O7 to reach a Cr+6 concentration of 250 mg·L−1 and incubated at 25°C in dark. After 14, 28 and 42 days of incubation, Cr+3 was measured in the following fractions: 1) water soluble fraction, 2) exchangeable fraction and 3) total in soil. Most of Cr+3 remaining in soil was found in the water soluble or exchangeable fraction, especially in the batch of basic soil. Results from this study confirm the environmental hazard caused by chromium spills in soils as it is available to plants and could be leachated to the ground water for long time.
Key words: Cr+6 / pH / organic matter / redox reaction / agricultural soils
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.