深圳近岸海域海洋动物稀土元素组成特征及配分模式研究

目的建立定量测定深圳近岸海域海洋动物稀土元素(REE)的方法,并对REE组成特征以及配分模式进行分析研究。方法在深圳近岸海域采集60份海洋动物样本,采用电感耦合等离子体质谱法(ICP-MS)测定钇、镧、铈、镨、钕、钐、铕、钆、铽、镝、铒、钬、铥、镱、镥等15种稀土元素,并选择国家一级标准物质茶叶(GBW10016)进行定量分析的质量控制。结果软体动物、藤壶、鱼类及虾类的REE平均测定值分别为(2.66±2.28)、(4.69±1.32)、(0.03±0.03)和(0.07±0.02)μg/g;所测海洋动物的稀土配分特征总体上都表现为轻稀土元素的富集。结论(1)球粒陨石标准化处理表明,藤壶、软体动物和虾类与南海北部陆坡海洋沉积物、香港土壤以及中国大陆土壤稀土平均值配分模式较接近,而鱼类的则有所差异;(2)双壳类软体动物由于体内REE总量较高而存在食用安全风险;(3)由REE富集能力、与海洋沉积物相似的REE配分模式以及附着生长特性等方面的特征显示,藤壶及牡蛎是较好的海洋环境REE指示动物。

Rare earth elements in marine organisms from Shenzhen coastal region

Objective A sensitive quantificational method was set up to determine the rare earth elements (REE) in marine organisms from Shenzhen coastal region. Characteristics of REE contents and distribution patterns of REE were analyzed. Methods A total of 60 samples of marine organisms were collected at six sampling sites in the Shenzhen coastal region. Concentrations of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Ho, Tm and Lu in the samples were determined by inductively coupled plasma-mass spectrometry (ICP-MS). The quantificational method was validated with standard reference material GBW 10016 (tea-leaf). Results The mean concentrations of total REE in mollusk, barnacle, shrimp and fish were (2.66 ± 2.28), (4.69 ±1.32), (0.03 ± 0.03) and (0.07 ± 0.02)μg/g, respectively. Enrichment of light REE (LREE) over heavy REEs (HREE) were observed for all tested marine organisms. Conclusion (1)The chondrite-normalized distribution of REE for mollusk, barnacle and shrimp showed a similar pattern with those of sediment in northern continent slopes of the South China Sea, soils of Hong Kong and the Mainland (mean), while small differences were observed for fish. (2)Consumers would be faced with risk to eat the bivalves. (3)Barnacle and oyster were suggested here as bio-marker for REE in maine environment due to the high potential of REE enrichment, similar chondrite-normalized distribution to marine sediment and adhering life style of the two kind of animals.