Fluoride-sensitive electrode

Details Fluoride-sensitive electrode Fluoride-sensitive electrode

G - Physics

01

N

G01N 27/333 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2426476

The invention concerns a fluoride-sensitive electrode and the use of said electrode for measuring the fluoride content of water, in particular fluoridated drinking water. A fluoride- sensitive electrode of the invention with a lower cross-sensitivity for hydroxyl ions than known electrodes and which allows more accurate measurement of the fluoride content in water with a high pH in particular at low fluoride ion concentrations without the need for supplementing the sample water with conditioning additives has a tubular electrode shaft, a lanthanum fluoride crystal which closes one end of the electrode shaft, an internal electrolyte sealed between the lanthanum fluoride crystal and a closure in the electrode shaft, and a contact wire that dips into the internal electrolyte, wherein the internal electrolyte has a pH of >= 9.0 and a fluoride concentration of >= 0.1 M.

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