book: The ability of Azolla caroliniana to remove heavy metals (Hg(II), Cr(III), Cr(VI)) from municipal...

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	• The ability of Azolla caroliniana to remove heavy metals (Hg(II), Cr(III), Cr(VI)) from municipal waste water ... R. Bennicelli, Z. Stepniewska, ... Elsevier, 2004 view larger image
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This digital document is a journal article from Chemosphere, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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The aim of this paper was to investigate the capacity of a small water fern, Azolla caroliniana Willd. (Azollaceae), to purify waters polluted by Hg and Cr. Many plants are capable of accumulating heavy metals (called hyperaccumulators) and one of them is the water fern A. caroliniana. During 12 days of the experiment the fern was grown on the nutrient solution containing Hg^2^+, Cr^3^+ and CrO"4^2^- ions, each in a concentration 0.1, 0.5 and 1.0 mgdm^-^3. The presence of these ions caused a 20-31% inhibition of A. caroliniana growth, the highest in the presence of Hg(II) ions, in comparison to the control. After day 12 of the experiment, metal contents the solution decreased to 0-0.25 mgdm^-^3, and this decrease comprised between 74 (Cr^3^+ 1.0 mgdm^-^3 treatment) and 100% (CrO"4^2^- 0.1 mgdm^-^3 treatment). The fern took a lesser quantity of the metals from 0.1 mgdm^-^3 treatments compared to 0.5 and 1.0 mgdm^-^3 treatments. In the A. caroliniana tissues the concentration of heavy metals under investigation ranged from 71 to 964 mgkg^-^1dm; the highest level being found for Cr(III) containing nutrient solution.

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