Abstract

Perfluorooctanoic acid (PFOA) is considered a persistent environmental pollutant. The aim of this study was to assess the potential toxicity of PFOA to earthworms (Eisenia fetida) in artificial soil. The activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and glutathione S-transferase (GST) as well as the contents of malondialdehyde (MDA) were measured after exposure to 0, 5, 10, 20, and 40mgkg-1 PFOA in soils for 7, 14, 21, and 28days. The results showed that SOD activity increased at 14days and decreased from 21 to 28days; MDA levels were highest in the treatment with 40mgkg-1 PFOA after 28days of exposure. In contrast, CAT and POD activities increased after 14-21days of exposure and significantly decreased with long-term exposure (28days). GST activity increased significantly from 14 to 28days. Our results indicate that PFOA has biochemical effects on E. fetida, thereby contributing to our understanding of the ecological toxicity of PFOA on soil invertebrates.

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