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A Study on Ecotoxicological Effects of Nano-copper Oxide Particles to Portunus trituberculatus
Tiejun Li1, Hongmei Hu2, Chenghu Yang2
1College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
Background:
As an important nano-material, nano-copper oxide particles (CuO-ENPs) harbor a vast range of characteristics, including an electronic correlation effect, thermal stability, catalytic activity, sterilization, and other properties. At present, the mechanism of ecotoxicological effects of CuO-ENPs is unclear and has been inconclusive. Therefore, we aimed to explore the ecotoxicological effects of nano-copper oxide particles (CuO-ENPs) on Portunus trituberculatus.
Objective:
The crabs were exposed to seawater containing different concentrations of CuO-ENPs to conduct the acute toxicity test and chronic accumulation test.
Methods:
Acute toxicity, metal accumulation, and SOD activity in different tissues were determined.
Results:
We found that the lethal concentration of 50% 96 h LC50 of CuO-ENPs to Portunus trituberculatus belonged to low toxicity. The accumulation of CuO-ENPs in different tissues from high to low was: gill > haemolymph > muscle > hepatopancreas > heart and stomach, and decreased gradually with time after reaching the maximum.
Discussion:
Subsequently, it was in a relatively steady state after a certain period and showed an obvious concentration effect. With the increment of exposure time and concentration of CuO-ENPs, the SOD activities in different tissues were quite different. In conclusion, the 96 h LC50 of CuOENPs to Portunus trituberculatus was 49 mg/L, and its toxicity belonged to low toxicity.
Conclusion:
With the increment of exposure time and concentration of CuO-ENPs, the SOD activities in different tissues were quite different, which were increased remarkably in gill and hepatopancreas, but were suppressed at an early stage of exposure in muscle and haemolymph.
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