1. A STRAIGHTFORWARD METHOD FOR DETERMINATION OF Ba AND Sr TOTAL CONTENT IN NATURAL ZEOLITES BASED ON MICROWAVE-ASSISTED DIGESTION AND INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY. Authors: MARIN SENILA, OANA CADAR, LACRIMIOARA SENILA, ANCA BECZE, MARIUS ROMAN, BOGDAN ANGYUS, GABRIEL BRUJ.