Preparative separation of arsenate from phosphate by IRA-400 (OH) for oxygen isotopic work

► New method was developed for separation of arsenate from phosphate. ► The adsorption properties of IRA-400 (OH) resin were identified for both of arsenate and phosphate. ► The optimal selective desorption agent for arsenate was discovered. ► The detailed information of the surface of IRA-400 (OH) during the whole experiments was clarified.