JP3808952B2 - Combined suction / distribution electrode - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite electrode capable of suction measurement and flow measurement.
[0002]
[Prior art]
As a flow measurement pH electrode, conventionally, for example, as shown in FIG. 5, one in which a flow path a of a sample solution is formed in a horizontal direction is known. In FIG. 5, b is a pH responsive membrane, c is a glass electrode inner electrode, d is a glass electrode inner liquid, e is a liquid junction, f is a reference electrode inner liquid, g is a comparison electrode inner electrode, and h is an output cable. It is.
[0003]
[Problems to be solved by the invention]
In the conventional pH electrode for flow measurement described above, the glass processing occupies a large proportion in the production process, requires skill, and is expensive. In particular, in the double tube structure as described above, it is difficult for a skilled person to process a thick and thick response glass tube, and only a thin capillary shape can be obtained. The length of the glass portion could not be made too long, and the degree of freedom in designing the glass portion was extremely low.
[0004]
In addition, when only a small amount of sample liquid can be obtained, it is desirable to easily perform suction measurement with a dropper, bellows, etc. However, as described above, the flow path a of the sample liquid is formed in the horizontal direction. Further, it is necessary to separately attach a suction means such as a curved tube to the suction side, and the operation is troublesome. In addition, if the channel a has a small diameter, it may be difficult to mount a suction means such as a dropper on the suction side.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a low-cost composite electrode that can easily perform either flow measurement or suction measurement.
[0006]
[Means for Solving the Problems]
In the present invention, means for solving the above-described problems are configured as follows.
The invention according to claim 1, and the inner tube forming a flow path of the sample solution, the inner pipe to form an annular space between the inner tube in the middle of the inner pipe branches the outer wall of the tube and an outer tube which surrounds the front SL and part formed pH or other ion response membrane of the inner tube is surrounded outside the tube, the glass electrode is filled in the space between the inner and outer tubes an internal solution, an outer cylinder surrounding the inner electrode provided on glass electrode internal liquid inside, the double pipe so as to form an annular gap between the more becomes double pipe inner and outer tubes , double tube and the reference electrode internal liquid filling between the outer tube, a liquid junction that is provided in a portion of the inner tube in contact with the comparison electrode internal liquid, compared electrode internal solution in It is characterized by comprising a provided a reference electrode in the pole.
[0007]
For example, a synthetic resin molded tube with moderate shape retention is used for the outer cylinder, and a simple structure using rubber packing or the like for joining the outer cylinder and a double tube formed integrally with glass. In addition, the flow path of the sample solution can be formed in the vertical direction along the outer cylinder, and suction measurement using a dropper, bellows, or the like becomes extremely easy.
[0008]
The processing of the glass double tube itself is relatively easy, and in order to integrate the pipe-like response membrane into a part of the inner tube, the joining work is performed by fusion welding with a burner. It can be done and does not require skill in glass processing. In addition, the diameter and length of the inner tube can be set to appropriate values, and the degree of freedom in designing the glass portion is significantly improved.
[0009]
In the invention described in claim 2, wherein the inner tube in the invention of claim 1 is characterized that you have been directly introduced into specimen container.
[0010]
In the invention described in claim 3, direct suction means within said tube in the invention of claim 1 is characterized that you have been instrumentation wear.
[0011]
The invention according to claim 4 is characterized in that the outer cylinder and the inner cylinder in the invention according to claim 1 are integrated by a seal member.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the combined electrode for suction / distribution of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of a combined electrode for suction / circulation, and FIG. 2 is a partially enlarged view thereof. In these drawings, reference numeral 1 denotes an inner tube that forms a flow path for a sample liquid, and 2 denotes an intermediate tube 1 It is an outer tube that surrounds the inner tube 1 so as to branch and form an annular space 3 between the inner tube 1 and a double tube 4 comprising the inner tube 1 and the outer tube 2 is integrated with glass. Is formed.
[0013]
Reference numeral 5 denotes a pipe-like pH responsive membrane connected and integrated with a part of the inner tube 1 by fusion welding with a burner, etc. The above-mentioned space 3 is filled with a glass electrode internal liquid 6, and the glass electrode An internal electrode 7 is provided in the internal liquid 6 so as to correspond to the pH responsive film 5.
[0014]
8 is an outer cylinder made of a synthetic resin molded product having a shape-retaining property, and surrounds the outer pipe 2 so as to form an annular gap 9 between the double pipe 4, and the gap 9 includes an internal portion of the reference electrode. A liquid junction 11 is provided in a part of the inner tube 1 that is filled with the liquid 10 and is in contact with the reference electrode internal liquid 10, and is compared with the liquid junction 11 in the comparison electrode internal liquid 10. An electrode inner electrode 12 is provided.
[0015]
13 is a packing (seal member) interposed between the inner tube 1 and the outer tube 8, 14 is a packing interposed between the outer tube 2 and the outer tube 8, and 15 is an inner tube 1 and the outer tube. 2, a lead wire 121 connected to the reference electrode inner electrode 12 is provided in the packing 14, and a lead wire 71 connected to the internal electrode 7 is provided in the packing 15. Are respectively inserted and held. Reference numeral 16 denotes a rubber plug that is removably fitted in a plug hole for internal liquid replenishment provided in the outer cylinder 8, and 17 is an output cable.
[0016]
As shown in FIG. 3, the inner tube 1 in which the flow path for the sample solution is formed and the pH response membrane 5 is integrated is formed in the vertical direction along the outer tube 8 as shown in FIG. By inserting suction means such as a syringe 18 or bellows 19 into the upper part of the tube 1 and introducing the lower part directly into the sample container, suction measurement can be performed very easily. More preferably, according to the size and shape of the sample container or standard solution container, for example, by attaching a suction adapter 20 to the distal end of the inner tube 1, the distal end is protected and suction measurement is performed more efficiently. Can be done.
[0017]
On the other hand, when the flow measurement is performed, as shown in FIG. 4, the tubes 21 and 22 for flowing the sample liquid are connected to both ends of the inner tube 1, respectively, and the sample (standard solution) is passed through the pump. Just do it. In this flow measurement, the outer cylinder 8 may be held vertically by an electrode stand (not shown) or may be horizontally placed. Alternatively, it may be inverted, and in that case, it can be prevented from being affected by the liquid in the reference electrode leaking from the liquid junction portion 11 into the sample liquid. Note that in both cases of vertical installation and inversion, it is easy for air bubbles to escape upward, making it less likely to be affected.
[0018]
Since the pipe-shaped pH response membrane 5 integrated with the inner tube 1 is covered with the reference electrode internal liquid 10 on the entire circumference, a high electrostatic shielding effect can be obtained and the electrostatic interference action can be effectively performed. Can be prevented. Further, since the liquid contact area of the pH responsive membrane 5 can be set large, it goes without saying that high detection sensitivity and quick response can be obtained.
[0019]
Such a glass double tube 4 including the pH responsive membrane 5 can be obtained relatively easily without requiring a skilled person. In particular, the diameter and length of the inner tube 1 are increased. Since it can be set, the degree of freedom of design is greatly improved, and it is also a great feature that it can flexibly cope with a wide range of required specifications, such as for large plants. The present invention is not limited to the composite electrode for pH measurement, but by using another ion-responsive membrane instead of the pH-responsive membrane 5, the composite electrode for measuring ions other than pH (for example, Na ⁺ etc.) can be used. Can also be applied, and similar actions and effects can be obtained.
[0020]
【The invention's effect】
As described above, according to the combined suction / circulation electrode of the present invention, a response film is integrally formed on a part of the inner tube of the glass double tube, and the response film is covered with the liquid inside the comparison electrode. As a result, a high electrostatic shielding effect can be obtained. In addition, by storing the glass double tube in the synthetic resin-molded outer cylinder via packing etc., the glass processing part is reduced, the configuration is simplified, the manufacturing becomes easy, and the cost is reduced. Can be planned. In addition, the diameter and length of the inner tube forming the flow path of the sample solution can be set large, and a wide range of required specifications can be flexibly dealt with.
[0021]
And, by arranging the flow path of the sample liquid vertically, the flow path inlet can be directly inserted into the sample container or the standard liquid container without connecting pipes such as tubes, and suction measurement is simplified. Moreover, in the flow measurement, by connecting a tube to both ends of the flow path, measurement can be performed in any of the vertical, horizontal, and inverted positions.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an embodiment of a composite electrode for both suction and distribution according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the main part.
FIG. 3 is an explanatory diagram of the same suction measurement.
FIG. 4 is an explanatory diagram at the time of the distribution measurement.
FIG. 5 is a cross-sectional view showing an example of a conventional flow-type pH electrode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inner pipe | tube, 2 ... Outer pipe | tube, 3 ... Space, 4 ... Double pipe, 5 ... Response membrane, 6 ... Glass electrode internal liquid, 7 ... Internal electrode, 8 ... Outer cylinder, 9 ... Gap, 10 ... Comparative electrode Internal liquid, 11... Liquid junction, 12.

Claims (4)

An outer tube surrounding the inner tube, the inner tube so as to form an annular space between the inner tube in the middle of the inner pipe branches the outer wall of the tube forming the flow path of the sample solution, before Kigai and part formed pH or other ion response membrane of the inner tube is surrounded by a tube, a glass electrode internal liquid filling the space between the inner tube and the outer tube, glass electrode internal liquid an internal electrode provided within an outer tube surrounding the double pipe so as to form an annular gap between the more becomes double pipe between the inner tube and the outer tube, the double tube and the outer tube a comparison electrode internal liquid filled between a liquid junction that is provided in a portion of the inner tube in contact with the comparison electrode internal liquid, compared electrode internal liquid in the comparison electrode in electrode provided on the suction and distribution combined composite electrode, characterized in that it comprises an. Suction and distribution combined composite electrode according to claim 1 wherein the inner tube is characterized that you have been directly introduced into specimen container. Suction and distribution combined composite electrode according to claim 1, directly suction means in said tube, characterized that you have been instrumentation wear.   2. The combined suction / distribution electrode according to claim 1, wherein the outer cylinder and the inner cylinder are integrated by a seal member.

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