CN217237864U

CN217237864U - PVC membrane type ion selective electrode

Info

Publication number: CN217237864U
Application number: CN202121265272.6U
Authority: CN
Inventors: 王相; 钟琮玮; 庞喜龙; 赵佳浩; 翟广军
Original assignee: Weihai Jingxun Changtong Electronic Technology Co Ltd
Current assignee: Weihai Jingxun Changtong Electronic Technology Co Ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-08-19
Anticipated expiration: 2031-06-04

Abstract

The utility model relates to an electrochemistry detection sensor equipment field especially relates to a PVC diaphragm type ion selective electrode, can realize the accurate division of electrode inner space, uses more reliably. The utility model provides a PVC membrane type ion selective electrode, includes the casing, be divided into work electrode room and the reference electrode room that each other does not communicate in the casing, be equipped with working electrode in the work electrode room, be equipped with reference electrode in the reference electrode room, the work electrode room is not with the outside intercommunication of casing, casing one end is equipped with the measuring chamber, working electrode extends to in the measuring chamber, and measuring chamber one side opening is equipped with the PVC membrane. A reference electrode chamber and a working electrode chamber are divided in the shell, a measuring chamber is further arranged at the end part of the shell, and the three cavities are independently arranged.

Description

PVC membrane type ion selective electrode

Technical Field

The utility model relates to an electrochemistry detection sensor equipment field especially relates to a PVC diaphragm type ion selective electrode.

Background

The basic principle of the ion selective electrode technology is to determine the ion activity or concentration in a solution by using a membrane potential, wherein the membrane potential is an interphase potential, namely different two phases are in contact to generate charged ion transfer, and when equilibrium is reached, the ion activity or concentration can be deduced from a potential difference generated between the two phases. An ion selective electrode is a type of indicator electrode whose electrochemically active element is a "membrane", called the active membrane or sensing membrane, which determines the properties of the electrode, with different ion selective electrodes having different sensing membranes. By means of this "membrane" a specific ionic activity in solution can be converted into a potential signal, the membrane potential. According to the common structure of the membrane, the membrane can be divided into a crystal membrane electrode and a PVC membrane electrode.

The patent of Chinese utility model No. ZL2013206242823 mentions an ion electrode structure, is the three composite electrode of ion measuring electrode, reference electrode and temperature measuring electrode, has kept apart external electromagnetic interference through the sleeve pipe mode, has solved the problem that the reading is beated or drifted. However, in the process of designing and developing the electrode, since the inside of the electrode needs to be filled with an electrolyte solution or an insulating material, etc., the space inside the electrode needs to be accurately divided, and each part is ensured to be independent, so that an ion-selective electrode with definite internal structure separation and high reliability is absent at present.

SUMMERY OF THE UTILITY MODEL

Not enough to the above-mentioned of prior art, the utility model provides a PVC diaphragm type ion selective electrode can realize the accurate division of electrode inner space, uses more reliably.

The utility model provides a scheme as follows:

the PVC membrane type ion selective electrode comprises a shell, wherein the shell is internally divided into a working electrode chamber and a reference electrode chamber which are not communicated with each other, a working electrode is arranged in the working electrode chamber, a reference electrode is arranged in the reference electrode chamber, the working electrode chamber is not communicated with the outside of the shell, one end of the shell is provided with a measuring chamber, the working electrode extends into the measuring chamber to measureOne side of the chamber is opened and provided with a PVC film. A reference electrode chamber and a working electrode chamber are divided in the shell, a measuring chamber is further arranged at the end part of the shell, the three cavities are independently arranged, the reference electrode chamber and the working electrode chamber are respectively used for placing a reference electrode and a working electrode, the measuring chamber is used for containing standard ionic solution, and the ionic solution to be measured is solution with fixed concentration, such as 10 ^-2 Or 10 ^-3 A solution with mol/l concentration, wherein when nitrate ions need to be detected, the measuring chamber is filled with the nitrate ion solution with the concentration; and measuring the chloride ions, and then containing the chloride ion solution with the concentration. During detection, the front section is placed into a solution to be detected, and the concentration of the fixed solution in the measuring chamber is separated or infiltrated according to the concentration of the solution to be detected, so that a potential difference is generated, and the concentration of ions is measured through the potential difference.

Preferably, the shell comprises a cylindrical outer pipe and a cylindrical inner pipe which are sleeved, two ends of a space between the outer pipe and the inner pipe are sealed through end connectors to form a reference electrode chamber, and a working electrode chamber is formed on the inner side of the inner pipe. The reference electrode chamber and the working electrode chamber are coaxially arranged, so that the structure is more compact, and the two ends are convenient to seal and separate.

Preferably, the end connection spare is including the head connection spare that is located casing one end, head connection spare one end is equipped with the holding ring, the holding ring is located between outer tube and the inner tube, the outer tube suit is in the holding ring outside, and the holding ring suit is in the inner tube outside, there is the location arch holding ring inboard, location arch and inner tube contact, and the holding ring inboard is equipped with the baffle, and baffle one side is equipped with the grafting arch, the grafting arch is pegged graft with the inner tube, the baffle opposite side is the measuring chamber, the baffle is equipped with the through-hole, and one end intercommunication measuring chamber, one end run through the grafting arch. The partition plate partitions the measuring chamber, the annular bulge is used for sealing a cavity between the appearance and the inner tube, and the inserting bulge is used for sealing the space inside the inner tube to ensure that the reference electrode chamber and the working electrode chamber are kept sealed and partitioned.

Preferably, the end connecting piece comprises a tail connecting piece located at one end of the shell, the tail connecting piece is made of blocking cotton in an annular structure and located between the outer pipe and the inner pipe, and the tail connecting piece is connected with the outer pipe and the inner pipe in a sealing mode. The tail connecting piece can play a role in sealing through the blocking cotton.

Preferably, the reference electrode chamber is filled with a solution, and the solution is a potassium chloride saturated solution added with agar. The agar can make the potassium chloride saturated solution become viscous and not easily extend out, a small hole is arranged on the outer tube, the porous ceramic is filled in the small hole, and the solution can reduce the solution leakage at the porous ceramic.

Preferably, the reference electrode and the working electrode are silver wires, and the ends of the silver wires are plated with silver chloride.

Preferably, the tail end of the shell is provided with a detachable cover, and the cover is sleeved at the end of the shell. The lid can protect the PVC membrane under non-operating condition, and the lid can regard as the container that holds standard ionic solution liquid simultaneously for soak the PVC membrane head, keep detecting the precision, when solution long-term use leads to ion concentration to change in the measuring chamber, can make solution concentration return standard state through soaking in the lid.

A PVC membrane production method applied to the PVC membrane type ion selective electrode comprises the following steps:

s1: weighing solutes according to the weight percentage, including 1-10% of active substances, 1-2% of ionic additives, 29-32% of film forming substances and 58-66% of plasticizers, putting the solutes in a beaker, and adding a solvent, wherein the solvent is a tetrahydrofuran solvent, and the ratio of the solvent to the film forming substances is 1: 9-1: 19;

s2: placing the solute and the solvent in a magnetic stirrer, stirring for 0.5-1 h at the speed of 500r/s, introducing the obtained light yellow transparent colloidal solution into a glass dish with the diameter of 50mm, and naturally volatilizing for 24h at room temperature to obtain an elastic sensitive membrane;

s3: intercepting a sensitive film with the diameter of 12mm by using a puncher, sticking the sensitive film with the diameter of 12mm to the bottom end of the ion selective electrode by using a 5% PVC/THF solution, and placing the sensitive film in an ion solution to be detected with the concentration of 10-2mol/L for activation for more than 3 days after drying.

The active substance has a response effect on specific ions, so that the ion exchange membrane has a selective effect on the ions, and the active substance can be trioctylmethylammonium nitrate or bathophenanthroline silver and is used for detecting nitrate ions;

tetradodecylammonium bromide can be selected for detecting bromide ions;

tetradodecyl ammonium chloride can be selected for detecting chloride ions;

one of triglycyl bisdibenzylamine, triglycyl bisbenzylamine, triglycyl bisdiphenylamine, tetraphenyl 24-crown-8, 1,1, 1-tris [1 ' - (2 ' -oxa-4 ' -oxo-5 ' -aza-5 ' -methyl) dodecyl ] propane, bis (12-crown-4-methyl) malonate, N ' -dibenzyl-N, N ' -diphenyl-1, 2-phenylenedioxydiethylamide, and [3, 4-bis [2- (dicyclohexylamino) -2-oxyethoxy ] phenyl ] octadecanoic acid methyl ester can be selected for detecting sodium ions;

one of valinomycin, calixarene, benzo 15-crown-5, benzo 18-crown-6, diazepine 18-crown-6, 4-tert-butyl-2, 2,14, 14-tetraethyl-substituted-2A, 14A, dioxybridged calix [4] arene-tetra-tert-butyl tetraacetate and pimelic acid bis [ (benzo-15-crown-5) -15-ylmethyl ] ester can be selected for detecting potassium ions;

one of nonactin, urea, thiazole-dibenzocrown ether and calix [6] arene-hexaethyl acetate can be selected for detecting ammonium ions.

The film forming material is used for forming a film, the film forming material is PVC, and PVDF or polypyrrole can be selectively added.

The plasticizer is used for assisting in forming a film, improving the elasticity of the film, simultaneously having a certain effect on improving the sensitivity of an exchange film and the like, and can be one of decanol (1-DA), dioctyl phthalate (DOP), dibutyl phthalate (DBP), O-nitrophenyl octyl ether (O-NPOE), diisooctyl phthalate (DEHP), dioctyl sebacate (DOS), tributyl phosphate (TBP), 3-nitro-O-dimethyl (NOX) and trioctyl phosphate (TEHP), or can be mixed in proportion to obtain a composite plasticizer.

The ionic additive is used for increasing the activity of the membrane, and the ionic additive is sodium tetraphenylborate.

The utility model discloses following beneficial effect has:

1. the parts in the utility model are independently separated and not communicated with each other, and the electrode chambers and the measuring chamber are not influenced with each other, so that the utility model has high use reliability, good sealing effect and easy leakage of electrolyte;

2. the electrolyte solution adopts a potassium chloride saturated solution added with agar, has higher viscosity and is less prone to leakage;

3. the cover can not only play a role in protecting the PVC film, but also can be used for containing a solution for soaking the PVC film, so that the measurement precision is kept;

and 4, the selectivity of the PVC membrane can be increased by adding different active substances, and the applicability is stronger.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the external structure of the present invention;

FIG. 2 is a schematic view of the external appearance and internal structure;

FIG. 3 is a schematic view of the internal structure of the present invention;

fig. 4 is a schematic sectional view of the head connector.

In the figure: 1-outer tube, 2-inner tube, 3-reference electrode chamber, 4-working electrode chamber, 5-head connecting piece, 6-tail connecting piece, 7-cover, 8-PVC film, 11-porous ceramic, 31-reference electrode, 41-working electrode, 51-measuring chamber, 52-opening, 53-positioning ring, 54-positioning projection, 55-clapboard, 56-splicing projection, 57-through hole and 61-blocking cotton.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in fig. 1 to 4, the present embodiment provides a PVC membrane ion selective electrode, which includes a housing, the housing includes a cylindrical outer tube 1 and a cylindrical inner tube 2 which are sleeved, two ends of a space between the outer tube 1 and the inner tube 2 are sealed by end connectors to form a reference electrode chamber 3, and an inner side of the inner tube 2 forms a working electrode chamber 4. Working electrode room 4 and reference electrode room 3 are each other not intercommunicated, are equipped with working electrode 41 in the working electrode room 4, are equipped with reference electrode 31 in the reference electrode room 3, and working electrode room 4 does not communicate with the casing outside, and casing one end is equipped with measuring chamber 51, and in working electrode 41 extended to measuring chamber 51, measuring chamber 51 one side was equipped with opening 52 and was equipped with PVC membrane 8.

End connection spare is including the head connection spare 5 that is located casing one end, 5 one ends of head connection spare are equipped with holding ring 53, holding ring 53 is located between outer tube 1 and inner tube 2, outer tube 1 suit is in the holding ring 53 outside, holding ring 53 suit is in the inner tube 2 outside, holding ring 53 inboard has location arch 54, location arch 54 and the contact of inner tube 2, holding ring 53 inboard is equipped with baffle 55, baffle 55 one side is equipped with grafting arch 56, grafting arch 56 pegs graft with inner tube 2, the junction sets up retardant cotton. The other side of the partition 55 is a measuring chamber 51, the partition 55 is provided with a through hole 56, one end of the through hole is communicated with the measuring chamber 51, and the other end of the through hole penetrates through the inserting projection 56. The PVC membrane covers the open outside of the measurement chamber 51.

The end connecting piece comprises a tail connecting piece 6 located at one end of the shell, the tail connecting piece 6 is blocking cotton 61 of an annular structure and located between the outer pipe 1 and the inner pipe 2, and the tail connecting piece 6 is connected with the outer pipe 1 and the inner pipe 2 in a sealing mode.

The reference electrode chamber 3 is filled with a solution, and the solution is a potassium chloride saturated solution added with agar. The end part of the outer tube 1 is provided with a small hole, and porous ceramics 11 are placed in the small hole. The working electrode chamber 4 is filled with an insulating material for fixing the electrode, and silica gel is used in this embodiment. The reference electrode 31 and the working electrode 41 are silver wires, and silver chloride is electroplated on the ends of the silver wires.

The tail end of the shell is provided with a detachable cover 7 which is sleeved at the end part of the shell.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A PVC membrane type ion selective electrode is characterized in that: the measuring device comprises a housing, be divided into the working electrode room and the reference electrode room that do not communicate each other in the casing, be equipped with working electrode in the working electrode room, be equipped with reference electrode in the reference electrode room, working electrode room not with the outside intercommunication of casing, casing one end is equipped with the measuring chamber, working electrode extends to in the measuring chamber, and measuring chamber one side opening is equipped with the PVC membrane.

2. The PVC membrane ion selective electrode of claim 1, wherein: the shell comprises a cylindrical outer tube and a cylindrical inner tube which are sleeved, two ends of a space between the outer tube and the inner tube are sealed through end connectors to form a reference electrode chamber, and a working electrode chamber is formed on the inner side of the inner tube.

3. The PVC membrane ion selective electrode according to claim 2, wherein: the utility model discloses a casing, including casing, tip connecting piece, locating ring, baffle, fixing ring, locating protrusion, inner tube, end connecting piece is including the head connecting piece that is located casing one end, head connecting piece one end is equipped with the holding ring, the holding ring is located between outer tube and the inner tube, the outer tube suit is in the holding ring outside, and the holding ring suit is in the inner tube outside, there is the location arch the holding ring inboard, location arch and inner tube contact, and the holding ring inboard is equipped with the baffle, and baffle one side is equipped with the grafting arch, the grafting arch is pegged graft with the inner tube, the baffle opposite side is the measuring chamber, the baffle is equipped with the through-hole, and one end intercommunication measuring chamber, and one end runs through the grafting arch.

4. The PVC membrane ion selective electrode of claim 2, wherein: the end connecting piece comprises a tail connecting piece located at one end of the shell, the tail connecting piece is made of blocking cotton of an annular structure and located between the outer pipe and the inner pipe, and the tail connecting piece is connected with the outer pipe and the inner pipe in a sealing mode.

5. The PVC membrane ion selective electrode of claim 1, wherein: and a solution is filled in the reference electrode chamber, and the solution is a potassium chloride saturated solution added with agar.

6. The PVC membrane ion selective electrode of claim 1, wherein: the reference electrode and the working electrode are silver wires, and silver chloride is electroplated at the end parts of the silver wires.

7. The PVC membrane ion selective electrode according to claim 1, wherein: the shell tail end is provided with a detachable cover, and the cover is sleeved at the end of the shell.