九龙江河口区稀土元素地球化学特征

用电感耦合等离子体质谱（ICP-MS）对2007年10月航次采集的九龙江河口区溶解态、悬浮颗粒态、沉积物样品中的稀土元素（REEs）进行了测定,对REEs的地球化学特征进行研究.结果表明,REEs在各相态中的含量范围如下：溶解态的为0.1 ng/dm^3（Eu）～1.96μg/dm^3（Ce）,悬浮颗粒态的为0.28（Tm）～142.83（Ce）mg/kg,沉积物的为0.25（Tm）～99.65（Ce）mg/kg;溶解态、悬浮颗粒态及沉积物中REEs球粒陨石标准化配分曲线均表现为负斜率型,九龙江河口为LREE相对HREE富集型河口.九龙江河口溶解态、悬浮颗粒态、沉积物三相态中REEs含量受流域土壤、地表径流等源区因素影响较大.Ce异常值在各相态中表现为负异常.

Geochemical characteristics of rare earth elements in Jiulongjiang Estuary

The concentrations of rare earth elements（REEs） in estuarine water,suspended particulate materials and sediment samples collected from Jiulongjiang Estuary（24°00′～24°00′N,117°00′～118°00′E） in October,2007 were obtained by inductively coupled plasma mass spectrometry（ICP-MS）.The concentrations of REEs ranged from 0.1 ng/dm3（Eu）～1.96 μg/dm3（Ce） for dissolved total REEs in water,0.28（Tm） ～142.83（Ce） mg/kg for total REEs in suspended particulates,and 0.25（Tm） ～99.65（Ce） mg/kg for total REEs in sediments.The chondrite-normalized REE distribution patterns for estuarine water,suspended particulate matter,and sediment was characterized by a profile of light REEs enrichment when compared with heavy REEs and a negative slope.Negative Ce anomalies have been observed in areas of Jiulongjiang Estuary.