Assessing the Potential Risks of Microplastics in Aquatic Ecosystems through Different Biological Models
學生姓名:
陳姿蓉
指導教授:
凌明沛
學期:
111上
摘 要:
Since the ubiquity and massive number of microplastics (MPs) in ocean have been revealed, more attention has given to the contribution of freshwater systems as main emitting sources of MPs. Previous studies had pointed out that MPs were prone to accumulate in freshwater fish and had negative interactions in organisms, the extent of the MPs-induced potential health impact on freshwater fish in freshwater should be further explored. Therefore, the purposes of this study are to use the species sensitivity distribution (SSD) model and the toxicokinetic/toxicodynamic (TK/TD) model to analyze the risk quotient (RQ) and exceedance risk (ER) to assess the potential ecological risk and metabolic disturbance induced by MPs exposure in freshwater fish. The results showed that the pollution of MPs in surface water was
affected by human population density, industrialized activity, and tributary input. MPs which entered the organism were affected by the particle size and the concentration of MPs. Regarding the risk assessment, the first study showed MPs which found in the two sampling sites (S11 and S13) sampled from nearby tributaries at the urban center showed high risk (RQ>1). The second study demonstrated that Asian freshwater fish posed the highest risk. When the ER was 50%, it indicated that the MPs increased the superoxide dismutase (SOD)
activity of Asian zebrafish to 0.42 fold and the activity of 7-benzyloxy-4-trifluoromethyl coumarin o-dibenzyloxylase (BFCOD) of Asian red tilapia was 1.32%. The RQ were all greater than 1, indicating that the MPs-contaminated freshwater environment on these three continents
were likely to pose a health risk to freshwater fish. However, there were uncertainties in the risk assessment results of either the first or the second study. To conclude, this study provides the pollution of MPs in environment and preliminary risk results, helping to reduce pollution of environmental MPs and reduce the risk of human MPs exposure from fish consumption.
affected by human population density, industrialized activity, and tributary input. MPs which entered the organism were affected by the particle size and the concentration of MPs. Regarding the risk assessment, the first study showed MPs which found in the two sampling sites (S11 and S13) sampled from nearby tributaries at the urban center showed high risk (RQ>1). The second study demonstrated that Asian freshwater fish posed the highest risk. When the ER was 50%, it indicated that the MPs increased the superoxide dismutase (SOD)
activity of Asian zebrafish to 0.42 fold and the activity of 7-benzyloxy-4-trifluoromethyl coumarin o-dibenzyloxylase (BFCOD) of Asian red tilapia was 1.32%. The RQ were all greater than 1, indicating that the MPs-contaminated freshwater environment on these three continents
were likely to pose a health risk to freshwater fish. However, there were uncertainties in the risk assessment results of either the first or the second study. To conclude, this study provides the pollution of MPs in environment and preliminary risk results, helping to reduce pollution of environmental MPs and reduce the risk of human MPs exposure from fish consumption.
專題討論20221005_陳姿蓉_摘要.pdf