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- W4328107726 abstract "Mercury (Hg) can enter a lake via processes such as air deposition and run-off. In lake water, Hg is converted into highly neurotoxic methylmercury (MeHg), primarily by bacteria, and the MeHg is then bioaccumulated and biomagnified along the food chain. The data and models used in risk assessment may be associated with uncertainty that can be incorporated into the analysis using a fuzzy approach. The objective of this research was to assess the integrated human health and ecological risks of MeHg in Lake Phewa, Nepal using a fuzzy approach. The concentration of MeHg in fish tissue was obtained by sampling fishes and their laboratory analysis using standard methods. The measured MeHg in fish tissue was used to estimate the concentration of MeHg in water by applying a bioaccumulation factor (BAF). MeHg concentration in rice was also estimated using data obtained from the literature. A questionnaire survey was conducted to estimate fish consumption rates among different occupations: fishermen, local people, hotel owners, government staff, army/police, and others (visitors). An integrated risk assessment (IRA) framework proposed by the World Health Organization (WHO) was applied to estimate health risk to humans and ecological risk to fishes. The results show that fish consumption contributed approximately 90% or higher to overall human health risk and the remaining risk was attributed to rice consumption. Hotel owners, fishermen, and others (visitors) in particular had potentially significant health risks from MeHg, with hotel owners being an even higher risk group. The higher health risk was primarily due to very high fish consumption rates. Moreover, the ecological risk to fishes was within acceptable levels. The risk estimate using the fuzzy approach approximates uncertainty in decision-making, building more confidence in decisions for risk assessors." @default.
- W4328107726 created "2023-03-22" @default.
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- W4328107726 date "2023-03-17" @default.
- W4328107726 modified "2023-10-02" @default.
- W4328107726 title "Fuzzy‐based Integrated Risk Assessment of Methylmercury in Lake Phewa, Nepal" @default.
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- W4328107726 doi "https://doi.org/10.1002/9781119569503.ch2" @default.
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