When the gel permeation chromatography( GPC) method and ultraviolet and visible spectrophotometer( UV) method are used to detect absorption capacity of polycarboxylate superplasticizer( PCE),the interference effects generated by grinding aids such as triethanolamine,sodium acetate,stearic acid and sodium lignosulphonate are studied respectively.The result shows that PCE and grinding aids can be separated effectively by GPC chromatographic column when GPC method is used to determine the adsorption capacity o...