Premium
An extrapolation method for the fast evaluation of the fluoride ion‐selective electrode equilibrium potential in continuous flow analysis
Author(s) -
Wang Xue D.,
Shen Wei,
Cattrall Robert W.,
Nyberg Graeme L.,
Liesegang John
Publication year - 1995
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140070304
Subject(s) - fluoride , extrapolation , electrode , analytical chemistry (journal) , chemistry , ion , ion selective electrode , interfacing , flow injection analysis , tap water , inorganic chemistry , materials science , chromatography , detection limit , mathematics , selectivity , computer science , mathematical analysis , environmental science , biochemistry , organic chemistry , environmental engineering , computer hardware , catalysis
The fluoride ion‐selective electrode has been used in continuous flow analysis to determine the fluoride concentration in aqueous solution. The varying electrode potentials, E ( t ), were collected in the first 60 s by an interfacing computer, and the equilibrium potential of the electrode was predicted using an extrapolation method. This value agrees to within ±0.5 mV of the comparative value obtained by allowing sufficient time for the electrode to reach a steady state. Like flow‐injection (FI), continuous flow (CF) analysis with this extrapolation method significantly shortens the time required for routine fluoride concentration measurements, but it also achieves a higher sensitivity than FI. The method has been applied to the determination of fluoride in city tap water.