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Determination of Boron Trifluoride in Boron Trifluoride Complex by fluoride ion selective electrode

Transactions of Tianjin University 2016年第1期22卷 83-88页

作者：郎五可张卫江唐银徐姣张雷 School of Chemical Engineering and Technology Tianjin University College of Chemistry and Life Science Weinan Normal University School of Pharmaceutical Engineering Shenyang Pharmaceutical University

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.

关键词： boron trifluoride complex fluoride ion selective electrode sodium hydroxide aluminum chloride

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Determination of fluoride in Various Samples Using a fluoride selective electrode

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Journal of Analytical Sciences, Methods and Instrumentation 2020年第4期10卷 97-103页

作者： Kamal Shaiyad Miya Vinay Kumar Jha Central Department of Chemistry Tribhuvan University Kathmandu Nepal

fluoride is widespread in the environment, water, air, vegetation and Earth’s crust which can entre ground and surface water by natural process. fluoride in minute quantities is essential component for human health and help in normal mineralization of bone and formation of dental enamel. The determination of fluoride in some species was performed by using fluoride ion-selective electrode by direct measurement and standard addition method. The concentration of fluoride ion was determined in drinking water (from different place at Kathmandu), toothpaste, various brand of tea and coffees. The range of fluoride concentration in water sample was 0.16 to 0.39 mg/l, tea and coffee samples were 0.011 to 0.084 mg/l and its value of toothpaste was 0.026 to 0.75 mg/l. The concentration of fluoride ion obtain from different sample was compared with the legitimate value given by the world health organization.

关键词： fluoride TISAB Water Tea Coffee Toothpaste fluoride ion selective electrode Dental Carries

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