In the presence of ammonium sulfate,the extraction behavior of Cd~(2+) was studied by potassium iodide-propanol aqueous two-phase in the presence of ammonium sulfate,and the optimal conditions of phase separation were selected.The reaction conditions,such as the selection of complexant,the amount of KI and (NH_4)_2SO_4,pH value,on the extraction rate were investigated.Results showed that,without the need of chromogenic agent,CdI_4~(2-) can be extracted into the upper layer of propanol by the formation of io...