Inhibitory Effect of Titanium Dioxide Nanoparticles on the Growth of Freshwater Algae
Document Type : Research Paper
Authors
1 Department of Fisheries, Islamic Azad University, Science and Research Branch, Tehran, Iran.
2 Department of Fisheries, Islamic Azad University, Science and Research Branch, P.O. Box: 14515-775, Tehran, Iran.
Abstract
In this research, the effect of titanium dioxide nanoparticles on 6 samples of freshwater algae specimens was studied. The experimental algae were recognized after purification by molecular methods and put under the effect of nano-titanium dioxide densities of 0/001, 0/01, 0/1 and 1 mgL-1. The results indicated that nano titanium dioxide has inhibitory effect on the growth of Chlamydomonas moewusii, Chlamydomonas sp., Chlorococcum oleofaciens (strain 1), Chlorococcum oleofaciens (strain 2) and Scenedesmus obliquus, whilst their lipid peroxidation was increased after at least 48 h exposure. In contrast, chlorophyll a of Chlorococcum oleofaciens (strain 3) was increased after 96 hours exposure with nano titanium dioxide, while its lipid peroxidation decreased. Finding of the present research indicated that different species could differently respond to nano titanium dioxide exposure that may result in changing of species dominance of water resources.
Keywords
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