COLL 216 |
| Winya Dungkaew1, Kenneth J. Haller1, Adrian E. Flood2, and John F. Scamehorn3. (1) School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand, (2) School of Chemical Engineering, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand, (3) Institute for Applied Surfactant Research, University of Oklahoma, Norman, OK 73019 |
| The phases produced from precipitation of aqueous sodium hydrogen arsenate with barium chloride solution were studied both in the absence and presence of poly(diallyldimethyl ammonium chloride). Barium to arsenate molar ratios of 1:2, 1:1, 3:2, 2:1, 5:2, and 3:1 and pH from 2.0-13.5 in steps of 0.5 pH units were used. White precipitates were obtained for pH 5.5 and higher for every molar ratio in both the absence and presence of polyelectrolyte. Pure BaHAsO4∙H2O, Ba5Cl(AsO4)3, and NaBaAsO4∙9H2O phases and mixed phases of BaHAsO4∙H2O/NaBaAsO4∙9H2O, BaHAsO4∙H2O/Ba5Cl(AsO4)3 and Ba5Cl(AsO4)3/NaBaAsO4∙9H2O were identified by powder x-ray diffraction. Energy dispersive x-ray fluorescence confirmed the presence of Ba, As, Cl, and Na consistent with the phase assignments. Fourier transform infrared spectroscopy showed the arsenate bands, and where indicated, water bands. |
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Posters: Fundamental Research in Surface and Colloid Chemistry
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |