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Citation: LANG Wuke, TANG Yin, SUN Jing. Thermodynamics Analysis of High Concentration F--Al3+ System for Fluorine Determination[J]. Chinese Journal of Applied Chemistry, ;2016, 33(7): 848-854. doi: 10.11944/j.issn.1000-0518.2016.07.150354 shu

Thermodynamics Analysis of High Concentration F--Al3+ System for Fluorine Determination

  • a.

    a. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China;

  • b.

    b. College of Chemistry and Environment, Weinan Normal University, Weinan, Shaanxi 714099, China;

  • c.

    c. College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, China

  • Corresponding author: LANG Wuke, 
  • Received Date: 9 October 2015
    Available Online: 1 February 2016

    Fund Project:

  • The species and equilibrium constants were assigned for F--Al3+ system in Visual MINTEQ software. The similarity between the simulated titration curves and experimental ones, and the accordance confirms this assignment. The masking effect of sodium hydroxide and masking mechanism was investigated according to the equilibrium distribution simulation of F-(0.01/0.1 mol/L)-Al3+(0.02 mol/L)-OH- system. Although the species and aluminum masking mechanism are different in these two systems, aluminum can be masked efficiently at pH 11~12. The larger discrepancy between the simulated titration curve and the experimental curve in the latter system is due to the slower reaction rate of the latter system. Furthermore, the permissible aluminum concentration at pH 11~12 was obtained by simulation. Considering the interference of OH- to fluoride ion selective electrode, pH is limited to 11.5±0.2 for the determination of fluoride at 0.01~0.1 mol/L, and the maximum aluminum concentration masked at pH 11.5 is 0.02 mol/L. This method suits for the determination of high F concentration in the F-Al system. The error analysis indicates that the standard calibration curve method is more accurate than standard addition method if the potential error is larger than the error of electrode slope constant.
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