Disclosed herein is a use of a composition, comprising a non-toxic polyanionic material or a salt thereof to dissociate a polymeric membrane. In addition, a method of dissociating a polymeric membrane is also presented, the method comprising the steps of providing a polymeric membrane; and dissociating the polymeric membrane by adding a composition comprising a non-toxic polyanionic material to the polymeric membrane.本文中揭示一種包含無毒多價陰離子性材料或其鹽之組成物用於解離一聚合膜的用途。另外,亦提出一種解離聚合膜之方法,該方法包含下列步驟:提供一聚合膜;及藉由對該聚合膜添加一包含無毒多價陰離子性材料之組成物來解離該聚合膜。