生态环境学报Issue(9)：1499-1504,6.DOI:10.16258/j.cnki.1674-5906.2015.09.012
珠江入海口海产品中总汞与甲基汞含量特征及食用风险
Concentration Characteristics and Edible Risk of Total Mercury and Methylmercury in Marine Products from the Pearl River Estuary
摘要
Abstract
Methylmercury is one of the bioaccumulation environmental contaminants and eating marine products is the main source to expose to methylmercury. Thus, 11 different kinds of marine products were captured from the Pearl River Estuary in spring, 2015. The concentrations of total mercury (THg) and methylmercury (MeHg) were determined using direct combustion-atomic absorption spectrometry and KOH/CH3OH digestion-gas chromatography (GC)-cold atomic fluorescence (CVAFS) to study the distribution characteristics of mercury in different kinds of marine products and to evaluate the risk of mercury exposure. The results showed that the concentrations of THg and MeHg in the marine products were 27.1μg·kg-1 to 231.4μg·kg-1 (dry weight, the same here after in this paper) and the THg ranged from 21.7μg·kg-1 to 197.0μg·kg-1 (dry weight, the same here after in this paper), and the proportion of MeHg in THg ranged from 70.2 % to 92.9%. Compared to marine products of other domestic districts, the THg and MeHg concentrations in fish of the Pearl River Estuary were significantly higher, while the THg and MeHg concentrations in shellfish presented in an intervallic way, and in crustacean were similar. The MeHg and THg concentrations in different marine products decreased as fish (152±75.1 μg·kg-1, 127±58.0 μg·kg-1) > crustacean (87.7±44.2 μg·kg-1, 63.4±34.1 μg·kg-1) > shellfish (29.7±7.2μg·kg-1, 24.3±3.2 μg·kg-1), probably because they were in different levels of the food chain. The results indicated that the concentrations of MeHg and THg in the same kinds of marine products were related to the water layer in which their preys lived, with a tendency that the fish which preyed in the lower-middle layer or bottom layer>the loligo (Loligo chinensis) which preyed in the upper-middle layer. The MeHg and THg concentrations in marine products did not exceed the maximum allowed level set by domestic or international organizations. By the consumption of marine products, the population of these areas was exposed to MeHg with a maximum of 0.2μg·g-1·d-1, which was lower than the reference dose (1.1μg·g-1·d-1) established by US EPA and the provisional tolerable weekly intake (equivalent to 1.6 μg·g-1·d-1) by WHO/FAO. Thus, human exposure to MeHg via consumption of marine products from the Pearl River Estuary was in a safe range.关键词
水生生物/总汞/甲基汞/暴露风险Key words
aquatic biology/total mercury/methylmercury/exposure risk分类
资源环境引用本文复制引用
高志强,张毅强,李杰,陈来国,刘明,赵伟,许振成..珠江入海口海产品中总汞与甲基汞含量特征及食用风险[J].生态环境学报,2015,(9):1499-1504,6.基金项目
国家环保公益性行业科研专项项目（200809011）；国家自然科学基金项目 （）
