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Related Experiment Videos

Separation of fluoride from fluoroelastomers by diffusion in test tubes.

P Venkateswarlu1

  • 13M/Industrial Chemical Products Division, 3M Center, St. Paul, Minnesota 55144.

Analytical Chemistry
|February 15, 1992
PubMed
Summary

A simplified fluoride separation method uses test tubes, eliminating grease. This new technique accurately analyzes fluoride in various samples, including complex fluoroelastomers.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Conventional fluoride separation using Conway diffusion cells relies on grease, posing procedural complexities.
  • Hexa- (HMDS) and trimethylfluorosilane (TFS) are key compounds in fluoride analysis.

Purpose of the Study:

  • To develop a simpler, grease-free method for fluoride separation via diffusion.
  • To validate the new method for diverse sample matrices, including biological and polymer samples.

Main Methods:

  • Fluoride separation performed in 5-mL test tubes, avoiding grease.
  • Analysis of fluoride in water, urine, and bone samples.
  • Grinding fluoroelastomer samples in liquid nitrogen followed by methyl ethyl ketone-assisted perchloric acid diffusion.

Main Results:

  • Grease-free diffusion method yields results comparable to conventional techniques.
  • Accurate fluoride determination achieved in water, urine, and bone.
  • Effective separation of fluoride from both partly and fully cured fluoroelastomers.

Conclusions:

  • The developed test tube diffusion method offers a simpler and effective alternative for fluoride analysis.
  • This technique is suitable for a wide range of samples, enhancing analytical efficiency.

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