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International Journal of Nanomaterials and Chemistry
An International Journal


Volumes > Volume 2 > No. 2


Uptake of Cadmium by the Green Alga Scenedesmus quadricauda in the Presence of Selenium Nanoparticles

PP: 47-52
Ahmed A. Issa, Mustafa A. Fawzy, Bahej El-Deeb,
The observed nanoparticles consisted of elemental selenium as determined by X-ray spectroscopy (XRD) analysis indicated corresponding three intense peaks in the whole spectrum of 2Ɵ values ranging from 20 to 70. The green alga Scenedesmus quadricauda was incubated with cadmium, selenium and Selenium nanoparticles (Se-NPs) singly and in combination. In all treatments Selenium (Se) has counteract the toxicity of cadmium. The uptake of Cd2+ was reduced by selenium nannoparticales (0.02, 0.04mM). The growth rate was inhibited by the treatment of S. quadricauda with Cd2+ alone, however, in all selenium or nanoparticles containing culture Scenedesmus exhibited higher rates of growth. The photosynthetic pigments (Chl. a) as well as other metabolites of S. quadricauda cells seem to be the determinant in this work. Se-NPs variably abolished the effects of the Cd toxicity. The maximal positive effect of Se-NPs was found at a concentration of 0.04 while with lower concentration (0.01) it was negligible. The study provides a new insight into the impact of Selenium nanoparticles on S. quadricauda, especially with regard to its detoxicification of Cd2+, bioaccumulation and bioremediation potential.

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