Dissolved organic matter and aluminum oxide nanoparticles synergistically cause cellular responses in freshwater microalgae

Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Nan YeDe-Gao Wang

Abstract

This study investigated the impact of dissolved organic matters (DOM) on the ecological toxicity of aluminum oxide nanoparticles (Al2O3NPs) at a relatively low exposure concentration (1 mg L-1). The unicellular green alga Scenedesmus obliquus was exposed to Al2O3NP suspensions in the presence of DOM (fulvic acid) at various concentrations (1, 10, and 40 mg L-1). The results show that the presence of DOM elevated the growth inhibition toxicity of Al2O3NPs towards S. obliquus in a dose-dependent manner. Moreover, the combination of DOM at 40 mg L-1 and Al2O3NPs resulted in a synergistic effect. The relative contribution of Al-ions released from Al2O3NPs to toxicity was lower than 5%, indicating that the presence of the particles instead of the dissolved ions in the suspensions was the major toxicity sources, regardless of the presence of DOM. Furthermore, DOM at 10 and 40 mg L-1 and Al2O3NPs synergistically induced the upregulation of intercellular reactive oxygen species levels and superoxide dismutase activities. Analysis of the plasma malondialdehyde concentrations and the observation of superficial structures of S. obliquus indicated that the mixtures of DOM and Al2O3NPs showed no significant effect on membrane lipid peroxida...Continue Reading

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Citations

Apr 29, 2019·Applied Microscopy·Amall Ramanathan
Oct 2, 2021·Environmental Science and Pollution Research International·Minashree Kumari, Arun Kumar

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Methods Mentioned

BETA
transmission electron microscopy
electron microscopy
MDA

Software Mentioned

SPSS Statistics

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