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Determination of Boron Trifluoride in Boron Trifluoride Complex by Fluoride Ion Selective Electrode 被引量:1
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作者 郎五可 张卫江 +2 位作者 唐银 徐姣 张雷 《Transactions of Tianjin University》 EI CAS 2016年第1期83-88,共6页
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... 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 p H value was limited and hardly related to F-concentration and boric acid. It is better to control p H 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 ℃ 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. 展开更多
关键词 boron trifluoride complex fluoride ion selective electrode sodium hydroxide aluminum chloride
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Kinetics of the Reaction Between Boron Trifluoride Methanol Complex and Sodium Methoxide to Produce Enriched ^(10)B Methylborate
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作者 郎五可 张卫江 +2 位作者 唐银 徐姣 张雷 《Transactions of Tianjin University》 EI CAS 2016年第2期139-143,共5页
The relation of boron trifluoride concentration with conductivity in boron trifluoride methanol solution(BF_3-CH_3OH)was power exponent fitted in low concentration range. The kinetics of the reaction between boron tri... The relation of boron trifluoride concentration with conductivity in boron trifluoride methanol solution(BF_3-CH_3OH)was power exponent fitted in low concentration range. The kinetics of the reaction between boron trifluoride methanol complex and sodium methoxide to produce enriched ^(10)B methylborate was proposed based on a detailed mechanism study, and was verified by acid-base titration method and conductivity method. It was found that this reaction is first order reaction and the rate constant is 0.022 min^(-1) at 338 K(65 ℃), the activity energy is 65 k J/mol. In addition, it was found that the conductivity method is more feasible to measure the kinetic curve than acid-base titration method. 展开更多
关键词 boron trifluoride methanol complex sodium methoxide CONDUCTIVITY KINETICS
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