Bennicelli R, Stepniewska Z, Banach A, Szajnocha K, Ostrowski J
Department of Biochemistry and Environmental Chemistry, Catholic University of Lublin, Al. Kraśnicka 102, 20-718 Lublin, Poland.
Chemosphere. 2004 Apr;55(1):141-6. doi: 10.1016/j.chemosphere.2003.11.015.
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 Hg2+, Cr3+ and CrO4(2-) ions, each in a concentration 0.1, 0.5 and 1.0 mg dm(-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 mg dm(-3), and this decrease comprised between 74 (Cr3+ 1.0 mg dm(-3) treatment) and 100% (CrO4(2-) 0.1 mg dm(-3) treatment). The fern took a lesser quantity of the metals from 0.1 mg dm(-3) treatments compared to 0.5 and 1.0 mg dm(-3) treatments. In the A. caroliniana tissues the concentration of heavy metals under investigation ranged from 71 to 964 mg kg(-1) dm; the highest level being found for Cr(III) containing nutrient solution.
本文旨在研究小型水生蕨类植物卡罗来纳满江红（Azolla caroliniana Willd.，满江红科）净化汞和铬污染水体的能力。许多植物能够积累重金属（称为超富集植物），其中之一就是水生蕨类植物卡罗来纳满江红。在为期12天的实验中，将这种蕨类植物种植在含有Hg2+、Cr3+和CrO4(2-)离子的营养液中，每种离子的浓度分别为0.1、0.5和1.0 mg dm(-3)。与对照组相比，这些离子的存在导致卡罗来纳满江红的生长受到20%-31%的抑制，在Hg(II)离子存在的情况下抑制作用最强。实验第12天后，溶液中的金属含量降至0-0.25 mg dm(-(3))，这种下降幅度在74%（Cr3+ 1.0 mg dm(-3)处理组）至100%（CrO4(2-) 0.1 mg dm(-3)处理组）之间。与0.5和1.0 mg dm(-3)处理组相比，蕨类植物从0.1 mg dm(-3)处理组中吸收的金属量较少。在卡罗来纳满江红组织中，所研究的重金属浓度范围为71至964 mg kg(-1) dm；在含Cr(III)的营养液中发现的含量最高。
