1. EX-SITU PORTABLE X-RAY FLUORESCENCE SPECTROMETRY FOR THE MAJOR ELEMENTS DETERMINATION IN SILICATE GEOLOGICAL SAMPLES USING MATRIX-MATCHING STANDARDS FOR CALIBRATION. Authors: ANAMARIA IULIA TÖRÖK, CLAUDIU TĂNĂSELIA, CECILIA ROMAN, FERENC PUSKAS, MARIN SENILA.2. OPTIMIZATION OF GOLD SORPTION FROM AMMONIACAL THIOSULPHATE SOLUTION ON ANION EXCHANGE FIBER USING TAGUCHI EXPERIMENTAL DESIGN. Authors: EMILIA NEAG, ANAMARIA IULIA TÖRÖK, ZAMFIRA DINCA, MARIN SENILA, CERASEL VARATICEANU, ERIKA ANDREA LEVEI, EKATERINA SHILOVA, FRANCOISE BODENAN.3. ASSESSMENT OF TOXIC ELEMENTS CONTAMINATION IN SURFACE WATER AND SEDIMENTS IN A MINING AFFECTED AREA. Authors: ANA MOLDOVAN, ANAMARIA IULIA TÖRÖK, OANA CADAR, MARIUS ROMAN, CECILIA ROMAN, VALER MICLE.4. NUTRIENT AND ORGANIC MATTER REMOVAL FROM CHICKEN MANURE LEACHATE USING CHLORELLA SPP. . Authors: ZAMFIRA DINCA, MARIA-ALEXANDRA HOAGHIA, ANAMARIA IULIA TÖRÖK, ENIKO KOVACS, OANA CADAR, EMILIA NEAG, CECILIA ROMAN.5. LEAD ISOTOPIC RATIO DETERMINATION IN CAVE SEDIMENTS USING TRIPLE-QUADRUPOLE INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY. Authors: CECILIA ROMAN, ERIKA ANDREA LEVEI, BOGDAN ANGYUS, ANA MOLDOVAN, CLAUDIU TĂNĂSELIA, ANAMARIA IULIA TÖRÖK.