Distribution of mercury in fishes and environmental media of a contaminated site and the influence of biological behavior
Date Issued
2006
Date
2006
Author(s)
Chen, Hui-hsin
DOI
zh-TW
Abstract
Fishery products will accumulate mercury via their food source in contaminated water bodies, and then be consumed by people, and causing the injury to human bodies. This study is aimed to develop the method predicting the mercury concentration in fish and the human risk. The bottom mud samples, water sample, fish, specimen were collected during September 2005 to March 2006.
The results showed that the total mercury concentrations of Elops machnata was up to 3.26±0.70ppm. The concentrations of total mercury for Mugil cephalus was only 0.30±0.06ppm. However, biomagnification is not obvious.
The result of δ15N analysis indicates no correlation with the trophic level base on the fish. The concentration of mercury in the fish`s body is independ of δ15N, however that the carnivorous fish of high trophic level contains higher concentration of mercury is confirmed.
The mercury concentration is related to δ15N in some individual fish, but varied with season. There is lower mercury concentration in winter. Comparing the fish's mercury concentration to the basic fish's character, we found that the mercury concentration is affected by the weight and length of fish.
The result of risk assessment suggest that Non-cancer Hazard Quotient (HQ) was lower than 1. There is no imminent hazard. However, the methyl mercury concentration in fish still exceeds the fish and shrimp's regulatory standard. Although the bottom residents which contains it is suggested, mercury has no danger immediate to local residents, that sealing this place and stopping harvesting the aquatic products is necessary.
Subjects
污染場址
汞
甲基汞
GC/MS
水產生物
營養階層
contamination site
mercury
methylmercury
fishery products
trophic level
Type
thesis
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