摘要
DUE to the unique chemical coherence and slight systematic difference properties, the REEs are extensively used as tracers for origin and evolution of the earth and its geology compositions （involved naturalwaters）. Soluble REE concentration in rivers is very low (10<sup>-12</sup>), and has a typical heavy REE enrichedpattern relative to the North American Shale Composite （NASC） than those of upper crust, suspendedmaterials and sediments. Negative Ce anomalies were widely observed in most of rivers. The behavior of REE in rivers can be affected by geology and chemical weathering of drainage basin,concentration and species of colloids and organs, major anions, pH, microbe action and so on. Especially pH is an important factor controlling the chemistry of water
