00000ctm a22000003a 4500 UP-8027390931313964778 Buklod 20160824141537.0 m |o d | ta 160824s2016 xx d r |||| u| (iLib)UPVIS-00042666959 Gift 5/11/16 VML/ess eng LG 995 2016 C5 V35 Valera, Jessebel Patchicoy Physico-spectrochemical characterization and antibacterial property of humic acid (HA) from Sta. Barbara artesian wellwater. Jessebel Patchicoy Valera. Miagao, Iloilo CAS, University of the Philippines Visayas 2016. 73 leaves computer print-out Special Problem (M.S. Chemistry) -- Miagao, Iloilo : University of the Philippines Visayas, April 2016. The coloration of Sta. barbara artesian well-water is due to humic acid (HA). HA is a complex organic compound formed in soils, sediments, and natural waters by biochemical and chemical reactions during the decay and transformation of plant and microbial remains. It was extracted through acid precipitation, centrifugation, and freeze-drying method, consecutively and was found to be present at 76.50 (4.48) mg/l. Scanning electron micrographs with 50x up to 35,000x magnification reveal that HA is an amorphous organic compound having no definite shapes and sizes. HA is seen as chipped granules tending to aggrefate to each other and with some crystalline salts bound to its structure. Humic acid. Physico-chemical. Scanning electron microscope. Spectroscopic. Antibacterial. Topor, Vivian Azucena Director, Graduate Program. Sadaba, Resurreccion Dean, College of Arts and Sciences. Martizano, Jay O. Adviser, Special Problem Committee. Cabrera, Rose Margaret A. Co-adviser, Special Problem Committee. UPVIS UPV-ML LG 995 2016 C5 V35 Thesis