SU1495706A1 - Ion-selective electrode with hard contact - Google Patents

Abstract

The invention relates to a physico-chemical method of analysis and, in particular, to the preparation of solid ion-selective electrodes used for the analysis of liquid media under laboratory and industrial conditions. The aim of the invention is to improve the manufacturability and reduction of the membrane of the ion-selective electrode with solid contact. For this purpose, in the manufacture of a three-layer membrane as a intermediate layer, a layered transition metal chalcogenide MX _{N is used} , where M = TI, V, CR, MO, W, FE

X = S, SE

N = 2,3, and as the contact layer - fine metallic copper. This eliminates the use of precious metals, in particular silver.

Description

na gmtsklis yu

one

(21) 4234506 / 31-25

(22) 04/27/87 -. - (46) 23.07,89-oByul „K 27

(71) Leningrad State University

(72) Yuo G. Vlasov, K, Ao Bychkov, JSC V o Legin, Yu, E .; Ermolenko,

V.V. Kolodnikov to M.S. Milosgova (53) 543: 257 (088 „8)

(56) USSR author's certificate No. 1075135, clo. Gg 01 N 27/30/23-002о84о

USSR Copyright Certificate № 63057:, cl. С- 01 N 27/30, 30о10 „78о

(34) ION-SELECTIVE ELECTRODE WITH SOLID CONTACT

(57) The invention relates to the physico-Invention relates to physicochemical methods of analysis, in particular to a method for obtaining solid-state ion-selective membrane electrodes used for the analysis of liquid media in laboratory and industrial conditions.

The aim of the invention is to increase the manufacturability and reduce the cost of the ion-selective electrode membrane with a solid contact.

This goal is achieved by the fact that upon receipt of a three-layer membrane of an ion-selective electrode with solid contact as prochemical methods of analysis and, in particular, to obtain solid and selective electrodes used for the analysis of liquid media in laboratory and industrial conditions. The aim of the invention is to increase the manufacturability and reduce the cost of the ion-sensitive electrode membrane with solid contact. To this end, in the manufacture of a three-layer membrane, a transition metal chalcogenide MX is used as the intermediate layer, Fe; X - S, Se; n 2, 3, and in / as a contact layer - fine metallic copper. This allows {switch off the use of precious metals, in particular silver,

from h

interlayer using one transition metal chalcogenide

.МХ, where М - Ti, Y, St, Mo, W, Fe; X - S, Se; P 2,3, and as a contact layer - chalk. Coded metal is copper.

Example, To obtain a crystalline ion-selective electrode with a solid contact sensitive to copper (I) ions, take 0.5 g of an electrode-active substance, which is an opportunistic mixture of copper and silver sulfides, O, 2 g of disulfide titanium and 0.1 g of fine metallic copper (average grain size of 20-40 microns). For floor

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about

31495706

All three components of the ion-sensitive membrane are poured into successive layers in a mold and pressed under pressure of 500 Sha at 100 ° C for 3 min. To the resulting membrane in a hot state (to avoid cracking 1-sh) are soldered

А§, АÑС1 / КС1 // 1 СН05 // test solution // investigated electrode 0.1 М

us with

electrode

Calibration solutions are prepared from copper nitrate (I) for solid-contact copper electrodes, as well as ammonium nitrate for ammonium selective electrodes. The linear region of the electrode function is in the range (1-3) 10 M, and the limit the detection rate is Mo. The slope of the electrode characteristic is 28–30 mV, the response time is 2–15 s.

For an ammonium selective electrode film, the detection limit is 3 S, the response time is 10–60 s, the potential stability during the year is t8 mV.

Laminated chalcogenides of transition metals can be used as an intermediate layer for ion-selective electrodes with various types of solids, used a current drain, after which the active part of the membrane is degreased and glued into the end of a PVC tube.

The following electrochemical cell is used to measure electrode characteristics:

 as membranes and having ionic conductivity on silver or other cations. Solid contact electrodes do not require the use of a scarce precious metal, silver.

Claims (1)

Invention Formula An ion-selective electrode with a hard-i contact, containing an electrode-active solid, an intermediate layer and a contact layer with a metal current, which is so that, in order to improve processability} as an intermediate layer A layered transition metal chalcogenide, MH, is used, where M is Ti, V, Cr, Mo ,. W, Fe; X - S, Se; n 2,3 a as a contact layer - fine metal copper