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with transference where the fluoride transport number is 1. As transference of charge through the crystal is almost exclusively due to fluoride, the electrode is highly specific to fluoride. The only ion which significantly interferes is hydroxide (OH). Generally such "alkaline error" can be
286:
Some commercially available reference electrodes have an internal junction which minimizes the liquid junction potential between the sample solution and the electrolyte in the reference electrode (KCl). The internal electrolyte is at fixed composition and the electrode response is given by the
63:
vacancies. Such a crystal is an ionic conductor by virtue of the mobility of fluoride ions which jump between lattice vacancies. An electrochemical cell may be constructed using such a crystal as a membrane separating two fluoride solutions. This cell acts as a
226:
275:
137:
413:
Martin S. Frant and James W. Ross Jr. Electrode for
Sensing Fluoride Ion Activity in Solution. Science 23 December 1966:Vol. 154. no. 3756, pp. 1553 - 1555
376:
Light, Truman S.; Cappuccino, Carleton C. (1975). "Determination of
Fluoride in Toothpaste Using an Ion-Selective Electrode".
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In the lanthanum fluoride electrode, the sensing element is a crystal of
25:
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is an internal reference inside the fluoride selective electrode
28:
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The cell diagram of a typical experimental arrangement is:
195:
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69:avoided by buffering the sample to a pH below 7.
221:{\displaystyle {\ce {Hg|1/2Hg2Cl2 | KCl(sat)}}}
356:is the Faraday constant (9.6485309×10 C/mol).
8:
270:{\displaystyle {\ce {NaF,NaCl | AgCl,Ag |}}}
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132:{\displaystyle {\ce {Ag,AgCl|NaF|LaF3|}}}
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24:sensitive to the concentration of the
7:
365:is the activity of the fluoride ion.
228:is an external reference electrode
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423:Fluoride ion-selective electrodes
334:is the standard cell potential,
328:is the measured cell potential,
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98:
1:
378:Journal of Chemical Education
39:Lanthanum fluoride electrode
18:fluoride selective electrode
31:. A common example is the
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340:is the ideal gas constant,
139:fluoride analyte solution
22:ion selective electrode
346:is the temperature in
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53:europium(II) fluoride
234:
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390:1975JChEd..52..247L
282:Reference electrode
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66:concentration cell
45:lanthanum fluoride
33:lanthanum fluoride
398:10.1021/ed052p247
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417:Further reading
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289:Nernst equation
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51:), doped with
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384:(4): 247–50.
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20:is a type of
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73:Cell diagram
59:) to create
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17:
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35:electrode.
438:Electrodes
432:Categories
370:References
443:Fluorine
302: −
143:where:
26:fluoride
406:1133123
386:Bibcode
348:kelvins
321:where:
61:lattice
404:
402:PMID
253:AgCl
245:NaCl
95:AgCl
55:(EuF
47:(LaF
394:doi
310:ln
239:NaF
211:sat
204:KCl
112:LaF
103:NaF
29:ion
434::
400:.
392:.
382:52
380:.
304:RT
298:=
291::
259:Ag
187:Cl
174:Hg
155:Hg
89:Ag
16:A
408:.
396::
388::
363:F
360:a
354:F
350:,
344:T
338:R
332:E
326:E
317:,
315:F
312:a
308:F
306:/
300:E
296:E
263:|
256:,
249:|
242:,
214:)
208:(
200:|
191:2
178:2
168:2
165:1
159:|
125:|
116:3
107:|
99:|
92:,
57:2
49:3
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