A coated-wire gold(III)-selective electrode based on the 1,2,4,6tetraphenylpyridinium tetrachloroaurate(II1) ion-pair is described. The response is Nernstian in the gold concentration range lo-'-3 X 10d (slope 59.0 mV/pAu). Of the 22 ions tested, only the interference of thallium(II1) is important.
Coated-wire ion-selective electrodes
β Scribed by L. Cunningham; H. Freiser
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 522 KB
- Volume
- 180
- Category
- Article
- ISSN
- 0003-2670
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β¦ Synopsis
Coated-wire
ion-selective electrodes were first developed in 1971, and comprise a film of polyvinyl chloride or other suitable polymeric matrix substrate containing a dissolved electroactive species, coated on a conducting substrate (generally a metal, although any material with conductivity substantially higher than that of the film can be used). Electrodes of this sort are simple, inexpensive, durable and capable of reliable response in the concentration range of 10-l to 10d M for a wide variety of both organic and inorganic cations and anions. The principles on which these electrodes are based, as well as their application to a variety of analytical problems, will be discussed.
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