JPS61250548A - Comparing electrode - Google Patents
Comparing electrodeInfo
- Publication number
- JPS61250548A JPS61250548A JP9147385A JP9147385A JPS61250548A JP S61250548 A JPS61250548 A JP S61250548A JP 9147385 A JP9147385 A JP 9147385A JP 9147385 A JP9147385 A JP 9147385A JP S61250548 A JPS61250548 A JP S61250548A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- liquid
- internal
- potential
- common electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は比較電極に係り、特に血液や河川水などの液体
中の電解質を電気化学的に測定する場合の基準電位を保
つために使用する気泡が入った場合でも安定な基準電位
を与えるのに好適な構造の比較電極に関するものである
。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a reference electrode, and in particular to a reference electrode used to maintain a reference potential when electrochemically measuring electrolytes in liquids such as blood and river water. The present invention relates to a reference electrode having a structure suitable for providing a stable reference potential even when the reference potential is present.
第7図は従来のこの種比較電極の構成説明図である。第
7図において、1は比較電極セル、2は内部電極、12
はコモン電極、4は内部液注入口、5は被検体液注入口
で、比較電極セル1には、内部電極2とコモン電極12
とが配置してあり、電極セル9にはイオン電極1oが配
置してある。いま、内部注入口4より内部液を流し、被
検体液注入口5から被検体液を流すと、合流点7で被検
体液と内部液とが合流し、イオン電極1oと内部電極2
との間に回路が構成され、被検体液に含まれるイオン濃
度に比例した量を電圧として取り出すことができ、これ
によりイオン濃度を測定できる。FIG. 7 is an explanatory diagram of the structure of a conventional comparison electrode of this type. In FIG. 7, 1 is a comparison electrode cell, 2 is an internal electrode, and 12
is a common electrode, 4 is an internal liquid injection port, 5 is a sample liquid injection port, and the comparison electrode cell 1 has an internal electrode 2 and a common electrode 12.
are arranged, and an ion electrode 1o is arranged in the electrode cell 9. Now, when the internal fluid is poured from the internal injection port 4 and the specimen fluid is poured from the specimen fluid injection port 5, the specimen fluid and the internal fluid merge at the confluence point 7, and the ion electrode 1o and the internal electrode 2
A circuit is constructed between the two and can extract an amount proportional to the ion concentration contained in the body fluid as a voltage, thereby making it possible to measure the ion concentration.
ところで、この場合、合流点7で被検体液と内部液との
合流状態により液間電位が生ずるため、一般には合流点
7にコモン電極12を設置し、コモ:”’ta12をア
ースポテンシャルKL−1C−おく。By the way, in this case, a liquid potential is generated due to the confluence of the subject body fluid and the internal fluid at the confluence point 7, so generally the common electrode 12 is installed at the confluence point 7, and the common electrode 12 is connected to the ground potential KL-. 1C-Save.
しかしながら、被検体液の濃度により流れが異なつたり
、拡散状態が変わったりするため、従来の構成のコモン
電極12では完全に極間電位を抑えることができないと
いう欠点があった。なお、第7図に示す比較電極に関係
するものとしては、実開昭59−29759号公報があ
る。However, since the flow and the diffusion state change depending on the concentration of the body fluid to be examined, the common electrode 12 having a conventional configuration has a disadvantage in that the interelectrode potential cannot be completely suppressed. Incidentally, as related to the comparison electrode shown in FIG. 7, there is Japanese Utility Model Application Publication No. 59-29759.
本発明は上記に鑑みてなされたもので、その目的とする
ところは、被検液体と内部液との合流点での液間電位の
不安定性がなく、安定な基準電位を与えることができる
比較電極を提供することにおる。The present invention has been made in view of the above, and its purpose is to provide a comparison that can provide a stable reference potential without instability of the liquid junction potential at the confluence point of the test liquid and the internal liquid. Our goal is to provide electrodes.
本発明の特徴は、比較電極セルを絶縁物で構成し、内部
液と被検体液との合流状態によって生ずる液間電位をア
ースポテンシャルにするコモン電極はそれの先端の導体
部が上記内部液と上記被検体液との流絡部全体に接触す
るように大形に構成した点にある。The present invention is characterized in that the reference electrode cell is made of an insulator, and the common electrode, which turns the inter-liquid potential caused by the confluence of the internal fluid and the sample fluid into an earth potential, has a conductive portion at its tip that is connected to the internal fluid. The main feature is that it is constructed in a large size so as to come into contact with the entire flow junction with the body fluid to be examined.
以下本発明を第1図、第6図に示した実施例および第2
図〜第5図を用いて詳細に説明する。The present invention will be described below with reference to the embodiments shown in FIGS. 1 and 6 and the embodiments shown in FIG.
This will be explained in detail using FIGS.
第1図は本発明の比較電極の一実施例を示す構成説明図
でおる。第1図において、1は絶縁物で構成した比較電
極セル、2は内部電極、3はコモン電極、4は内部液注
入口、5は被検体液注入口り、内部液に先端導体が接触
しており、化学的に安定な状態に保っである。コモン電
極3は、白金を用いて構成してあり、シかも、その先端
導体部が内部液注入口4からの内部液と被検体液注入口
5からの被検体液との合流点7の液絡郡全体を覆うよう
に円筒状に構成してあり、先端導体部が液絡部に接触す
るように装着してあり、被検体液と内部液との合流状態
(拡散状態)による電位的な影響を受けないようにして
おる。8はコモン電極リード線である。9は電極セルで
、10は電極セルの被検体液流路11に挿入してあるイ
オン電極である。FIG. 1 is a structural explanatory diagram showing one embodiment of a comparison electrode of the present invention. In Fig. 1, 1 is a comparison electrode cell made of an insulator, 2 is an internal electrode, 3 is a common electrode, 4 is an internal fluid injection port, and 5 is a sample body fluid injection port, the tip conductor is in contact with the internal fluid. It is maintained in a chemically stable state. The common electrode 3 is constructed using platinum, and its tip conductor portion is connected to the liquid at the confluence point 7 of the internal liquid from the internal liquid inlet 4 and the subject body fluid from the subject body fluid inlet 5. It is configured in a cylindrical shape to cover the entire junction, and is attached so that the tip conductor comes into contact with the liquid junction, and the potential changes due to the state of confluence (diffusion state) of the body fluid to be examined and the internal fluid. I try not to be influenced by it. 8 is a common electrode lead wire. Reference numeral 9 represents an electrode cell, and reference numeral 10 represents an ion electrode inserted into the sample fluid channel 11 of the electrode cell.
次に、本発明に係る?較電極におけるコモン電極3の被
検体液と内部液との合流点7における働きを等何回路を
用いて従来法と比較しながら説明する。第2図は従来の
比較電極を用いたものの流路概略図、第3図はその等価
回路図、第4図は本発明に係る比較電極を用いたものの
流路概略図、第5図はその等価回路図で、第2図、第4
図において、第1図、第7図と同一部分は同じ符号で示
してある。また、第3図、第5図において、EJは合流
点7の電位、rlは合流点7の抵抗、r2はイオン電極
10の抵抗、a8は被検体液の全抵抗、Esはイオン電
極10の電位、RCはコモン電極12の抵抗、gcはコ
モン電極12の電位、E、は内部電極2の電位、R,は
内部電極2の抵抗、AI、A2.A3は増幅器、ECt
、ECzはコモン電極3の電位、RCI 、RC2は
コモン電極3の抵抗、Eoは出力電圧である。Next, what about the present invention? The function of the common electrode 3 in the reference electrode at the confluence point 7 of the body fluid to be examined and the internal fluid will be explained using an equal number of circuits and in comparison with the conventional method. Figure 2 is a schematic diagram of the flow path using a conventional comparison electrode, Figure 3 is its equivalent circuit diagram, Figure 4 is a schematic diagram of the flow path using the comparison electrode according to the present invention, and Figure 5 is its equivalent circuit diagram. The equivalent circuit diagrams are shown in Figures 2 and 4.
In the figure, the same parts as in FIGS. 1 and 7 are designated by the same reference numerals. In addition, in FIGS. 3 and 5, EJ is the potential of the confluence point 7, rl is the resistance of the confluence point 7, r2 is the resistance of the ion electrode 10, a8 is the total resistance of the sample body fluid, and Es is the resistance of the ion electrode 10. potential, RC is the resistance of the common electrode 12, gc is the potential of the common electrode 12, E is the potential of the internal electrode 2, R is the resistance of the internal electrode 2, AI, A2. A3 is an amplifier, ECt
, ECz is the potential of the common electrode 3, RCI and RC2 are the resistances of the common electrode 3, and Eo is the output voltage.
第2図の被検体液と内部液との合流点7の電位EJは、
被検体液の濃度、合流点7における流れ、拡散の状態が
変わると、コモン電極12が棒状であス+X、舘3図に
示す等何回路となり、完全にコモン電極12でアー廁電
位に抑えることができず、第3図の出力電圧Eoが変化
し、測定の誤差の原因となる。The potential EJ at the confluence point 7 of the subject body fluid and internal fluid in FIG. 2 is:
When the concentration of the body fluid to be tested, the flow at the confluence point 7, and the state of diffusion change, the common electrode 12 becomes a rod-shaped circuit such as A + Therefore, the output voltage Eo in FIG. 3 changes, causing measurement errors.
これに対して、本発明に係る第4図においては、被検体
液と内部液との合流点7全体をコモン電極3で広く覆う
ようにしてあるため、その等何回路は第5図に示すよう
に、EJ 、RC2、ECz 。On the other hand, in FIG. 4 according to the present invention, the entire confluence point 7 of the body fluid to be examined and the internal fluid is widely covered by the common electrode 3, so the circuits shown in FIG. As, EJ, RC2, ECz.
状態に起因する合流点7の電位EJが緩和され、イオン
電極10の電位E8の変化が出力電圧E0として取り出
され、高精度の測定が可能となる。The potential EJ of the confluence point 7 caused by the state is relaxed, and the change in the potential E8 of the ion electrode 10 is extracted as the output voltage E0, allowing highly accurate measurement.
なお、第1図においては、コモン電極3の先端導体部を
合流点7の全体を覆うように円筒状に構成したが、第6
図に示すよう乙3流点7の全体に接触するように大きな
板状に構成するようにしてもよく、はぼ同一の効果を得
ることができる。In FIG. 1, the tip conductor portion of the common electrode 3 is configured in a cylindrical shape so as to cover the entire confluence point 7, but
As shown in the figure, it may be configured in a large plate shape so as to contact the entire flow point 7 of Otsu 3, and almost the same effect can be obtained.
以上説明したように、本発明によれば、被検体液と内部
液との合流点での液間電位をほぼ完全にアースポテンシ
ャルにすることができ、安定な基準電位を与えることが
でき、高精度の測定を可能にすることができるという効
果がある。As explained above, according to the present invention, the potential between the liquids at the confluence of the body fluid to be examined and the internal fluid can be made almost completely to the earth potential, and a stable reference potential can be provided. This has the effect of making it possible to measure accuracy.
第1図は本発明の比較電極の一実施例を示す構成説明図
、第2図は従来の比較電極を用いたものの流路概略図、
第3図はその等価回路図、第4図は本発明に係る比較電
極を用いたものの流路概略図、第5図はその等価回路図
、第6図は本発明の他の実施例を示す構成説明図、第7
図は従来の比較電極の構成説明図である。
1・・・比較電極セル、2・・・内部電極、3・・・コ
モン電極、4・・・内部液注入口、5・・・被検体液注
入口、7・・・合流点、8・・・コモン電極リード線。FIG. 1 is a configuration explanatory diagram showing one embodiment of the comparison electrode of the present invention, and FIG. 2 is a schematic diagram of a flow path using a conventional comparison electrode.
FIG. 3 is an equivalent circuit diagram thereof, FIG. 4 is a schematic flow path diagram using the comparison electrode according to the present invention, FIG. 5 is an equivalent circuit diagram thereof, and FIG. 6 is a diagram showing another embodiment of the present invention. Configuration explanatory diagram, 7th
The figure is an explanatory diagram of the configuration of a conventional comparison electrode. DESCRIPTION OF SYMBOLS 1... Reference electrode cell, 2... Internal electrode, 3... Common electrode, 4... Internal liquid inlet, 5... Subject fluid inlet, 7... Confluence point, 8... ...Common electrode lead wire.
Claims (1)
用いる比較電極セル内の内部液に接する内部電極と、前
記内部液と前記被検体液との合流状態によつて生ずる液
間電位をアースポテンシャルにするコモン電極とよりな
る比較電極において、前記比較電極セルを絶縁物で構成
し、前記コモン電極はそれの先端の導体部が前記内部液
と前記被検体液との流絡部全体に接触するように大形に
構成したことを特徴とする比較電極。 2、前記コモン電極の先端の導体部は、前記液絡部全体
を覆うように円筒状に構成してある特許請求の範囲第1
項記載の比較電極。[Scope of Claims] 1. An internal electrode in contact with an internal liquid in a comparison electrode cell used when electrochemically measuring an electrolyte in a sample body fluid, and a state in which the internal liquid and the sample body fluid join together. In a comparison electrode consisting of a common electrode that transforms the potential between liquids into an earth potential, the comparison electrode cell is made of an insulator, and the common electrode has a conductor at its tip that connects the internal liquid and the sample liquid. A comparison electrode characterized in that it is constructed in a large size so as to come into contact with the entire flow section between the electrode and the electrode. 2. The conductor portion at the tip of the common electrode is configured in a cylindrical shape so as to cover the entire liquid junction portion.
Reference electrode as described in section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9147385A JPS61250548A (en) | 1985-04-26 | 1985-04-26 | Comparing electrode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9147385A JPS61250548A (en) | 1985-04-26 | 1985-04-26 | Comparing electrode |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61250548A true JPS61250548A (en) | 1986-11-07 |
Family
ID=14027360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9147385A Pending JPS61250548A (en) | 1985-04-26 | 1985-04-26 | Comparing electrode |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61250548A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6345554A (en) * | 1986-08-13 | 1988-02-26 | Terumo Corp | Ion sensor |
JP2015206630A (en) * | 2014-04-18 | 2015-11-19 | 株式会社堀場製作所 | Measurement system |
US9784705B2 (en) | 2014-04-18 | 2017-10-10 | Horiba, Ltd. | Measuring electrode and measuring system for chemical liquid |
-
1985
- 1985-04-26 JP JP9147385A patent/JPS61250548A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6345554A (en) * | 1986-08-13 | 1988-02-26 | Terumo Corp | Ion sensor |
JPH0467911B2 (en) * | 1986-08-13 | 1992-10-29 | Terumo Corp | |
JP2015206630A (en) * | 2014-04-18 | 2015-11-19 | 株式会社堀場製作所 | Measurement system |
US9784705B2 (en) | 2014-04-18 | 2017-10-10 | Horiba, Ltd. | Measuring electrode and measuring system for chemical liquid |
US10352889B2 (en) | 2014-04-18 | 2019-07-16 | Horiba, Ltd. | Measuring electrode and measuring system for chemical liquid |
US10359389B2 (en) | 2014-04-18 | 2019-07-23 | Horiba, Ltd. | Measuring electrode and measuring system for chemical liquid |
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