于 1 995— 1 996年在厦门海域采集了 2 8种鱼类样品 ,用ICP MS法测定了 1 5种稀土元素 (REE)的含量 ,研究了鱼体稀土元素的组成和分布模式及与海水环境之间的关系。结果表明 ,厦门海域鱼体REE总量介于 1 2 4— 5 96 5ng/g ,平均为 (77 5± 2 8)ng/g。鱼体明显富集轻稀土 ,同时轻、重稀土之间则存在较大的分馏作用 ,说明轻稀土的生物学效应比重稀土更为显著。鱼类稀土元素分布模式总体上与海水REE分布模式接近 ,并且鱼类REE含量与近岸陆架海水REE含量之间有很好的相关性 ,说明海洋鱼类对稀土元素的利用遵从丰度规律。鱼类对稀土元素的富集系数在 1 0 3以上。稀土元素沿厦门海域食物链的迁移传递没有表现出明显的生物放大作用Rare earth elements (REEs) in muscle tissues of fish from Xiamen coastal area were determined with an inductively coupled plasma mass spectrometer (ICP-MS) in order to understand the REE distribution pattern and their relations to the aquatic environment. Twenty-eight species of fish were collected, including eight middle-to-upper layer species, eight middle-to-lower layer species and twelve benthic species. The total REE contents varied from 12.4ng/g for Mugil carinatus to 596.5ng/g for Harpodon nehereus, with an average of (77.5±2.8)ng/g. The contents of light REEs (LREE), heavy REEs (HREE) and total REE in middle-to-lower layer and benthic species were higher than those of middle-to-upper layer species, which is consistent with REE distribution of seawater. Enrichment of LREE in fish muscle suggests higher biological effects of LREE than those of HREE. Significant correlations were found between HREE, while correlations between HREE and LREE were poor, indicating large fractionation between them. The similarity between distribution pattern of REE in fish and those of coastal seawater, and significant correlations between REE contents in fish and REE concentrations in coastal seawater suggest that utilization of REE by fish followed the "abundance law". Enrichment coefficients of REE in fish muscle relative to seawater were over 10 3. Combined with REE data of benthic seaweeds, molluscs and crustaceans collected at the same time, the transfer of REE along the food chain in Xiamen coastal areas showed no obvious biomagnification.教育部博士学科点专项科研基金资助项目,960 3 84 1 2号;; 国家“九五”科技攻关项目 ,97 92 6 0 2 0 2
