1. SOIL AND SPRING WATER POLLUTION IN TWO PROTECTED NATURAL AREAS IN MARAMUREŞ DISTRICT. Authors: LAURA ARDELEAN, MARIA GOREA, ELENA CICAL, ANGELA MICHNEA.2. PVC MATRX IONIC - SURFACTANT SELECTIVE ELECTRODES BASED ON THE IONIC PAIR TETRA ALKYL-AMMONIUM -LAURYLSULPHATE. Authors: CRISTINA MIHALI, GABRIELA OPREA, ELENA CICAL.3. CONSIDERATIONS ON THE RELATIVE EFFICACY OF ALUMINUM SULPHATE VERSUS POLYALUMINUM CHLORIDE FOR IMPROVING DRINKING WATER QUALITY. Authors: ELENA CICAL, CRISTINA MIHALI.4. SEASONAL EVOLUTION AND DEPTH VARIABILITY OF HEAVY METAL CONCENTRATIONS IN THE WATER OF FIRIZA-STRÎMTORI LAKE, NW OF ROMANIA. Authors: ELENA CICAL, FIRUTA GOGA, CRISTINA MIHALI, THOMAS DIPPONG.