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Wang F.,Zhejiang University | Yang J.,Zhejiang University | Li Y.,Zhejiang University | Yang X.,Huzhou Environmental Monitoring Center | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

Sediment derived phosphorus (P) is an important P source in waters. Simulation on the release of sediment P involved in most water quality models is oversimplified or lack of information, therefore couldn't effectively reflect the removal and transformation of the contaminants. In this study, a modified WASP model is developed to simulate the water quality in Tiaoxi estuary of Taihu Lake. The modification was based on sediment release dynamics under different hydraulic conditions. Results show that release rate of sediment P increased exponentially with the increase of flow velocity. Simulation results from our modified model are more accurate than the original model with default set. This study also suggests that much more attention should be paid to the release of sediment P in the simulation of water quality in the estuary. Source


Wang Y.,Tongji University | Qiu Y.-L.,Tongji University | Fei Y.,Huzhou Environmental Monitoring Center | Li L.,Tongji University | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2011

Concentrations of representative organochlorines (OCs), including organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in a batch of farmed mandarin fish from a cultivation pond in Wujiang City, Jiangsu Province, were determined with GC-ECD. Meanwhile, a preliminary human health risk assessment was conducted. Results showed that, the concentrations of dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs), hexachlorobenzene (HCB) and PCBs in the farmed mandarin fish were in the range of 1.3-4.57 ng/g, 0.13-1.24 ng/g, 0.07-0.44 ng/g and 0-5.22 ng/g, respectively, with an average value of 2.96, 0.40, 1.27 and 0.7 ng/g, respectively. These values were far below the corresponding residue limits set by China's Ministry of Health and the U. S. Food and Drug Administration, and at the low end of the global pollution bar. Referring to the reference values given by USEPA Integrated Risk Information System, calculated non-carcinogenic hazard ratios (HRs) of DDTs, HCB and PCBs were all <1 and carcinogenic HRs of DDTs, HCHs, HCB and PCBs were all >1.The results indicated that DDTs, HCHs and HCB in farmed mandarin fish did not have negative human health influence, but existed potential carcinogenic risk to humans. Compared to rural residents, urban residents were more vulnerable to DDTs, HCHs, HCB and PCBs threats. Source


Cheng B.,Tongji University | Qiu Y.,Tongji University | Li L.,Tongji University | Zhu Z.,Tongji University | And 4 more authors.
2010 4th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2010 | Year: 2010

South Taihu Lake used to get less attention in terms of environmental pollution study in the past Sediment and fish samples were collected from South Taihu Lake in 2009. Heavy met al.s were measured for both types of samples and potential health risks were evaluated. Concentration of Cu, Zn, Cr and Ni were determined for sediments samples, and Cu, Zn, Ni, Fe and Mn were determined for fish samples. It was found that the met al. levels in sediment were lower than the limits proposed by China National Environmental Quality Standard for Soils (GB 15618-95), but higher than the sediment background of Bohai Bay. Levels of determined met al.s varied significantly between male fish and female fish. Compared to Cu and Ni, Zn could accumulate easier in fish than in sediment. The determined met al. levels in fish were safe for human consumption. © 2010 IEEE. Source


Cao Y.,Key Laboratory of Yangtze River Water Environment | Cao Y.,Tongji University | Qiu Y.,Key Laboratory of Yangtze River Water Environment | Qiu Y.,Tongji University | And 11 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Concentrations and distribution of 20 organochlorines in the surface sediment of south Taihu Lake were studied and the relevant risk assessment was carried out. The results showed the concentrations of organochlorinated pesticides (OCPs) and polychlorinated biphenyls (PCBs) detected ranged from 1 to 31 ng·g-1(dw) and N.D. to 16 ng·g-1(dw), respectively, which was at a medium contamination level compared to the other fresh water sediments. The congener of CB194 and CB28 was the dominant pollutant among PCBs. Threshold effect concentration (TEC) and probable effect concentration (PEC) were used to evaluate the ecological risk of organochlorines. It was found that 90% of the sampling sites had a dichlorodiphenyltrichloroethanes (DDTs) value lower than the TEC, and PCBs values of all sites were lower than the TEC. The overall ecological risk of sediment in South Taihu Lake based on the studied organochlorines was low, whereas γ-HCH and HCB may pose a higher risk. © 2011 IEEE. Source


Wang Y.,Tongji University | Qiu Y.,Tongji University | Li L.,Tongji University | Cao Y.,Tongji University | And 5 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in a batch of aquatic organisms from Taihu Lake were determined with GC-ECD. Meanwhile, a preliminary human health risk assessment was conducted. The concentrations of hexachlorocyclohexanes (HCHs), dichlorodiphenyltrichloroethanes (DDTs), hexachlorobenzene (HCB) and PCBs were in the following ranking order: DDTs > HCHs > PCBs > HCB in snail and DDTs > PCBs > HCHs > HCB in white shrimp and silver fish, respectively. The levels of organochlorines (OCs) were in the following ranking order: snail < white shrimp < silver fish. The results may indicate the bioaccumulation of OCPs and PCBs in aquatic organisms. Referring to the reference values given by USEPA Integrated Risk Information System, calculated hazard ratios (HRs) based on contaminants' carcinogenic and noncarcinogenic health effects in adults in the general population were all <1. The results indicated that exposure of HCHs, HCB, DDTs and PCBs was unlikely to result in any adverse health effects. © 2011 IEEE. Source

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