A STUDY ON THE CONTENTS AND SPECIES OF RARE EARTH ELEMENTS IN THE WATER BODY IN THE WUHAN SECTION OF THE CHANGJIANG RIVER
长江武汉江段水体中稀土元素的含量和形态

The contents and partitioning characteristics of rare earth elements (REE) in Wuhan section of the Changjiang River were analysed by neutron activiation analysis (NAA). The contents of solvable fraction of REE in the river was very limited,with the same results as other rivers. On the other hand.the contents of suspended fraction of REE in the river varied in a wide range. It varied with the variation of contents of suspended matter in the water.Contents of REE in the sediments were almost the same with those in the suspended matter. REE were accumulated in fine grained particles,and this showed strong relationship with minerals.The distribution modes showed strong accumulation in the light REE and relatively deficit in Eu. The partitioning charateristics of REE in the sediments and suspended matter were quite similar,With the main amount in residual forms. The amount of five forms obeyed the following order:residual> > bound to organic matter>bound to FeMn oxides> boune to carbonates> > exchangeable. Compared with light and heavy REE, the medium REE(Eu, Sm, Tb) had relatively low percentages in the residual form and high in the forms which are bound to organic matter and Fe-Me oxides. The water bodies of the Wuhan section of the Changjiand River had not been polluted by REE.