Method for analyzing free fluorine in solutions containing hydrofluoric acid solution, and apparatus for practicing the method
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United States of America Patent
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Mar 25, 2003
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N/A
app pub date -
Jul 5, 2000
filing date -
Jul 6, 1999
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Expired
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Abstract
Free fluorine is measured in a hydrofluoric acid-containing solution with a coexistent metallic ion based on a total fluorine concentration, a total acid concentration, a metallic ion concentration, the equilibrium constant of hydrofluoric acid, and equilibrium constants of metal fluoride complexes. It is possible to accurately analyze free fluorine in a hydrofluoric acid-containing solution without being affected by a coexistent metal and by the passage of time. This technique may be used to accurately control the concentration of free fluorine in a hydrofluoric acid-containing mixed acid pickling solution at the production site of a stainless steel so that improvement in descaling capability as well as reduction in the amount of chemical materials can be achieved.
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