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Influence of Speciation of Thorium on Toxic Effects to Green Algae Chlorella pyrenoidosa


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1

School of Public Health, University of South China, Hengyang 421001, China

2

Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

3

School of Physical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China





*

Authors to whom correspondence should be addressed.



Academic Editor: Guido R. M. M. Haenen

Abstract Thorium Th is a natural radioactive element present in the environment and has the potential to be used as a nuclear fuel. Relatively little is known about the influence and toxicity of Th in the environment. In the present study, the toxicity of Th to the green algae Chlorella pyrenoidosa C. pyrenoidosa was evaluated by algal growth inhibition, biochemical assays and morphologic observations. In the cultural medium OECD TG 201, ThNO34 was transformed to amorphous precipitation of ThOH4 due to hydrolysis. Th was toxic to C. pyrenoidosa, with a 96 h half maximum effective concentration EC50 of 10.4 μM. Scanning electron microscopy shows that Th-containing aggregates were attached onto the surface of the algal cells, and transmission electron microscopy indicates the internalization of nano-sized Th precipitates and ultrastructural alterations of the algal cells. The heteroagglomeration between ThOH4 precipitation and alga cells and enhanced oxidative stress might play important roles in the toxicity of Th. To our knowledge, this is the first report of the toxicity of Th to algae with its chemical species in the exposure medium. This finding provides useful information on understanding the fate and toxicity of Th in the aquatic environment. View Full-Text

Keywords: thorium; speciation; toxicity; green algae; Chlorella pyrenoidosa thorium; speciation; toxicity; green algae; Chlorella pyrenoidosa





Autor: Can Peng 1, Yuhui Ma 2,* , Yayun Ding 2, Xiao He 2, Peng Zhang 2, Tu Lan 2, Dongqi Wang 2, Zhaohui Zhang 1,* and Zhiyong Zhang 2,3,*

Fuente: http://mdpi.com/



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