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1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China 2. College of Chemistry and Life Science, Weinan Normal University, Weinan, 714099, China 3. School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, 110016, China
刊物类别:Engineering
刊物主题:Chinese Library of Science
出版者:Tianjin University
ISSN:1995-8196
文摘
A method was proposed to determine boron trifluoride in boron trifluoride complex using fluoride ion selective electrode(ISE). Hydroxide was chosen to mask aluminum for the determination of 0.01—0.1 mol/L of fluoride. The simulation indicated that the permissible aluminum masked at a certain pH value was limited and hardly related to F-concentration and boric acid. It is better to control pH value below 11.5 and the aluminum concentration within 0.025 mol/L to minimize the interference of hydroxide to the fluoride ISE. The decomposition conditions of boron trifluoride by aluminum chloride were investigated. It is found that the F-detection ratio will approach 1.0 if the Al/F molar ratio is 0.3—0.7 and aluminum concentration is no more than 0.02 mol/L when heated at 80 °C for 10 min. In one word, hydroxide is quite fit to mask aluminum for samples which contain high content of fluoride and aluminum and the BF3 content can be successfully determined by this method.