Aqueous two-phase system(ATPS) is a green,environmentally friendly,new separation technology and is of wide application prospect,and becomes an advanced research hotspot in recent years.It is discussed about the application research situation in extracting and separating metal ions by ATPS,which is divided into three aspects according to different extracting agents:directly extracting metal ion without any extracting agent,extracting metal ion complex by forming anion complex(chelate) between metal cation a...