波西亚时光switch存档 www.ohjsu.icu 祝賀環境與健康研究中心研三朱麗蕓同學（導師：張敬東教授、李飛副教授）參與的中心關于洪湖水家養魚中重金屬的遷移轉化機制與健康風險管理項目的合作研究成果被
Process Safety and Environmental Protection
Abstract:?Honghu Lake, which listed in the “Ramsar Convention”, is the seventh largest freshwater lake in China and is regarded as one of the biggest freshwater product output areas in China. The toxic element distribution in cultured and wild fish and the corresponding health risks through fish consumption from Honghu area were investigated. The mean concentration in the muscle of cultured and wild fish (Carassius auratus and Ctenopharyngodon idellus) decreased in the order: Zn (18.94) > Cu (0.8489) > Cr (0.2840) > Pb (0.2052) and Zn (16.30) > Cr (1.947) > Cu (0.4166) > Pb (0.0525) > Cd (0.0060) (mean; mg/kg, wet weight). Scales (Multi factor pollution index (MPI) = 3.342) and the liver (MPI = 1.276) were regarded as the main accumulation tissues for cultured fish, and the bladder (MPI = 0.640) and intestine (MPI = 0.477) were regarded as the main accumulation tissues for wild fish. There were no obvious health risks associated with the consumption of cultured and wild fish based on the calculated results of the target hazard quotient (THQ), carcinogenic risk (CR), and estimated weekly intake (EWI). Pb and Cr were recognized as the major health risk contributors for inhabitants through wild and cultured fish consumption. Cultured fish had a greater health risk than wild fish based on the calculation results of THQ and CR. Muscle consumption resulted in more health risks than mixed edible tissues for cultured fish, but for wild fish, the conclusion was the opposite. Mixed fish (cultured:wild = 1:1) muscle consumption had relatively lower risks than the consumption of cultured or wild fish muscle separately. Consuming no more than 465 g/day (wet wt) of cultured fish muscle, 68 g/day (wet wt) of wild fish muscle, 452 g/day (wet wt) of mixed cultured fish edible tissues or 186 g/day (wet wt) of mixed wild fish edible tissues from the Honghu area can assure human health.
Distribution, bioavailability and probabilistic integrated ecological risk assessment of heavy metals in sediments from Honghu Lake, China
Abstract:?Heavy metals (Cr, Cu,Zn, Pb, Cd) concentrations and fractions in surface sediments from Honghu Lake weredetected by an atomic absorption spectrophotometer and Simple Bioavailability Extraction Test (SBET) from 11 typical sites to explore their spatial distribution, bioavailability?and sources. Results showed the mean Igeosand ecological risk degrees decreased in the order of Cd＞Cu＞Cr＞Pb＞Zn and Cd＞Cu＞Pb＞Cr＞Zn. Themetals’ bioavailability estimated by SBET decreased in thegeneral order of Cu＞Pb＞Cd＞Zn＞Cr.Under integrated consideration of metal enrichment, ecological risk and bioavailability,it obviously made the decision-makers confusedto identify final priority pollutants and priority areas. Thus, a probabilistic integrated ecological riskassessment method (PIERA) was formulated based on the potential ecological risk index (PER), SBET and triangular fuzzynumbers for synthetically assessing metal enrichment,ecotoxicity and bioavailability. With the help of PIERA, Cd was finallyregarded as the risk priority metal due to the integrated potential eco-risk of Cd madethe average contribution of 86.4% to the integratedRIs. Moreover, theareas around S5 and S2 were regarded as the risk priority areas. The case applicationof PIERA revealed that this improved method is of a better resolvingability which scientifically supplies the integrated informationof enrichment, bioavailability and systematic uncertainty for decision-makers comparedwith the other prevalent indexes (SQGs, Igeo, PER). The consequenceof the Pearson correlation analysis, distribution analysis andfield investigation indicated that Cd mainly originated from both non-pointagricultural and industrial pollution sources.