Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1990-04-05
1992-05-26
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204416, 204418, 252 623Q, 252500, 357 8, 422 8203, 564291, 568 9, 521 25, G01N 2746
Patent
active
051164817
ABSTRACT:
An anion-selective electrode of the present invention comprises, as anion sensitive substance, a tetraalkyl type, quaternary phosphonium salt having four alkyl radicals, each having 8 to 24 carbon atoms; a combination of a tetraalkyl onium salt having four alkyl radicals each having 10 to 24 carbon atoms, and an onium salt having one alkyl radical with 1 to 20 carbon atoms and three alkyl radicals with the proviso that the number of carbon atoms contained in the three alkyl radicals each is larger than that contained in the one alkyl radical; or a tetraalkyl type, quaternary onium salt having an asymmetrical molecular structure. The anion-selective electrode has good properties including selectivity and measurement accuracy. An anion-selective, field effect transistor or a chemical analysis apparatus, provided with the anion-selective sensitive substance, is suitable for measuring an anion concentration with a high accuracy.
REFERENCES:
patent: 4349426 (1982-09-01), Sugahara et al.
patent: 4670127 (1987-06-01), Ritter et al.
patent: 4936975 (1990-06-01), Shibata et al.
Miyagi Hiroyuki
Oki Naoto
Ozawa Satoshi
Shibata Yasuhisa
Gorgos Kathryn
Hitachi , Ltd.
Niebling John
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