1. POTENTIOMETRIC ANALYSIS OF ANIONIC SURFACTANTS BY ION-SELECTIVE ELECTRODE CONTAINING METHYLTRICAPRYLAMMONIUM CHLORIDE. Authors: CRISTINA MIHALI, ELENA HOPÂRTEAN, GABRIELA OPREA.2. THE COPPER, LEAD AND ZINC RECOVERY OF THE MINERALS PARTIAL OXIDATED WITH CHELATING ACTION REAGENTS. Authors: GABRIELA OPREA, CRISTINA MIHALI.3. ULTRASOUND ASSISTED CATHODIC REDUCTION OF 4,4''-DINITRODIBENZYLE. Authors: VIRGINIA DANCIU, VERONICA COŞOVEANU, GABRIELA OPREA, C. BERNARD.4. INVESTIGATION OF ADSORPTION PRODUCTS OF OXYNE ONTO BLENDE AND SMITHSONITE BY IR SPECTROSCOPY. Authors: GABRIELA OPREA, CRISTINA MIHALI.5. REAGENTS WITH CHELATANT ACTION FOR ZN (II) AND THE POSSIBILITY OF USING THEM IN FLOTATION. Authors: GABRIELA OPREA, CRISTINA MIHALI.6. PVC MATRX IONIC - SURFACTANT SELECTIVE ELECTRODES BASED ON THE IONIC PAIR TETRA ALKYL-AMMONIUM -LAURYLSULPHATE. Authors: CRISTINA MIHALI, GABRIELA OPREA, ELENA CICAL.7. COMPARATIVE STUDY OF MERCURY DETERMINATION IN SOIL AND VEGETABLE BY METHODS BASED ON THERMAL DECOMPOSITION-AAS AND WET DIGESTION CV-AFS. Authors: CECILIA ROMAN, GABRIELA OPREA, OANA CADAR, LĂCRIMIOARA ŞENILĂ, ERIKA LEVEI, MARIN ŞENILĂ.