JPS5968662A - Flow-system constant potential electrolytic cell - Google Patents
Flow-system constant potential electrolytic cellInfo
- Publication number
- JPS5968662A JPS5968662A JP17831282A JP17831282A JPS5968662A JP S5968662 A JPS5968662 A JP S5968662A JP 17831282 A JP17831282 A JP 17831282A JP 17831282 A JP17831282 A JP 17831282A JP S5968662 A JPS5968662 A JP S5968662A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- electrolytic cell
- constant potential
- flow
- air
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fuel Cell (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は流通式定電位電解セルに係り、特に、溶液中に
微量に含まれる被酸化性物質を定電位電解し流れた電流
を測定して検出するに適した流通式定電位電解セルに関
する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a flow-type constant potential electrolysis cell, and in particular, to a flow-type constant potential electrolysis cell, in particular, a cell that electrolyzes a trace amount of oxidizable substance in a solution at a constant potential and measures the current flowing. This invention relates to a flow-through type constant potential electrolysis cell suitable for detection.
従来、定電位電解法を採用した流通式クーロメトリ−検
出器では対極は作用電極と隔膜を介して対向配置され、
しかも、２つの電極で定電位電解を行なう（対極が参照
電極を兼ねる）ために対極を分極しないようにする目的
で特殊な対極用電解液が用いられている。それ故、単純
な電気活性物質の検出にすら対極液を流すポンプが必要
となり、装置を複雑にし、さらにはポンプからのノトズ
も加わって簡便に、しかも高感度に物質を検出する目、
的には不利であった。Conventionally, in flow-through coulometry detectors that use constant potential electrolysis, the counter electrode is placed opposite the working electrode with a diaphragm in between.
Moreover, since constant potential electrolysis is performed using two electrodes (the counter electrode also serves as a reference electrode), a special electrolytic solution for the counter electrode is used to prevent polarization of the counter electrode. Therefore, even simple detection of electroactive substances requires a pump to flow the counter electrode, which complicates the equipment.Furthermore, the noise from the pump is added, making it difficult to detect substances easily and with high sensitivity.
It was disadvantageous.
本発明の目的は、対極液なしで定電位電解を可能にする
流通式定電位電解セルを提供するにある。An object of the present invention is to provide a flow-through type constant potential electrolysis cell that enables constant potential electrolysis without a counter electrode.
すなわら、本発明は、上記流通式寛解セルにおいて、対
極に燃料電池に広く用いられる空気極（酸素極）を用い
るところに特許がある。空気中の酸素濃度は約２０％と
一定で、しかもＭｃ肩の′電極面積に対してＩ Ｉｌｌ
Ａ以下の電流を流すにＣよ充分すぎる位の、８．＃度
である。よって、対極として空気極を用い、１ｍＡ以下
の電流値で用いる分にはほとんど分極しないとみなせる
。それ故に、イオン伝導性の隔膜を介して作用電極と空
気極（対極）とを流れた電流による電圧降下（ｉｆ（、
ドロップ）が無視できる程に極めて近接させて対向配置
させ、それら２つの電極に一定電圧を印加することによ
ってほぼ定電位電解可能な流通式電解セルができる、空
気中の酸素が復極剤として働き、自然拡散により常に対
極表面に供給されるので、もはや対極液用送液ポンプも
必嶽としなくなる
〔発明の実施例〕
以下、本発明を実施例により詳細に説明する。In other words, the present invention is patented in that, in the above-mentioned flow-through remission cell, an air electrode (oxygen electrode) widely used in fuel cells is used as the counter electrode. The oxygen concentration in the air is constant at about 20%, and the area of the electrode on Mc's shoulder is
8. C is more than sufficient to flow a current of A or less. # degree. Therefore, when an air electrode is used as a counter electrode and a current value of 1 mA or less is used, it can be considered that there is almost no polarization. Therefore, the voltage drop (if(,
By placing these two electrodes so close together that they can be ignored, and applying a constant voltage to them, a flow-type electrolytic cell capable of almost constant potential electrolysis can be created.The oxygen in the air acts as a depolarizing agent. Since the counter electrode is constantly supplied to the counter electrode surface by natural diffusion, a liquid pump for the counter electrode is no longer required. [Embodiments of the Invention] Hereinafter, the present invention will be explained in detail with reference to Examples.
第１図は本発明による流通式定電位電解セルの一実施例
を示す模型断面図である。同図において、電解セル容器
６の中に、ゴム板１をくり抜いて接着剤で固定されたカ
ーボンクロス２．空気極５とその電気リード線１４．イ
オン変換器８およびゴム板１３をくり抜いて同様に接着
剤で固定されたり′ラツシーカーホン製布電極（作用電
極）１２をこの順に入れ、蓋７を被せて図示しないボル
トとナツトで締め付ける。電解セル容器６には空気出メ
、口３および３′と空気極５の外部への電気接続のだめ
のリード線４が、また、蓋７には電解すべき成分を含む
溶液をセルに導くチューブ９と排出用チューブ１１が接
続さへ作用電極１２の電気リード線が設けられている。FIG. 1 is a schematic sectional view showing an embodiment of a flow-type constant potential electrolysis cell according to the present invention. In the figure, a carbon cloth 2.0 is cut out from a rubber plate 1 and fixed with adhesive in an electrolytic cell container 6. Air electrode 5 and its electrical lead wire 14. The ion converter 8 and the rubber plate 13 are hollowed out, and cloth electrodes (working electrodes) 12 made of lacy carphone, which are similarly fixed with adhesive, are inserted in this order, and the lid 7 is placed on and tightened with bolts and nuts (not shown). The electrolysis cell container 6 has an air outlet, ports 3 and 3', and a lead wire 4 for electrical connection to the outside of the air electrode 5, and the lid 7 has a tube for guiding a solution containing the components to be electrolyzed into the cell. An electrical lead wire for a working electrode 12 is provided to connect the discharge tube 11 to the working electrode 9 .
電解セル容器６と蓋７とをボルトとナツトで締め付ける
ことにより、イオン変換膜８．ゴム板１３および蓋に囲
まれる作用電＆槽が形成され、チューブ９から流入する
溶液は作用電極１２にしみ込んで流れチューブ１１を経
て外部に排出される。By tightening the electrolytic cell container 6 and lid 7 with bolts and nuts, the ion conversion membrane 8. A working electrode and tank is formed surrounded by a rubber plate 13 and a lid, and the solution flowing from the tube 9 soaks into the working electrode 12 and is discharged to the outside through the flow tube 11.
一方、同時にセル容器６．ゴム板１および空気極（対極
）５とで囲まれる部分にカーボンクロスが満たされた空
間が形成されるが、ここに空気が出入口３および３′よ
り出入する。このカーボンクロスは空気を保持する役割
と、空気極５をイオン変換膜８に押し付ける役目を同時
にはたしている。Meanwhile, at the same time, cell container 6. A space filled with carbon cloth is formed in the area surrounded by the rubber plate 1 and the air electrode (counter electrode) 5, into which air enters and exits through the inlets and outlets 3 and 3'. This carbon cloth simultaneously serves the role of holding air and pressing the air electrode 5 against the ion conversion membrane 8.
空気極５はカーボンクロス２側が多孔性テフロンシート
でイオン変換膜８側に白金黒を主成分とする触媒が塗布
固定されている。触媒電極への′Ｉｌ気接続は、電気リ
ード側１４．カーボンクロス２および外部への電気リー
ド＃Ｍ４によって々される。The air electrode 5 has a porous Teflon sheet on the carbon cloth 2 side, and a catalyst containing platinum black as a main component is coated and fixed on the ion conversion membrane 8 side. The connection to the catalyst electrode is on the electrical lead side 14. It is connected by carbon cloth 2 and electrical lead #M4 to the outside.
電気リード線４および１０間に、検出目的成分に合わせ
て一定電圧を印加しておいて、たとえば、液体クロマト
グラフィーの分離カラムからの流出液をチューブ９より
作用電極槽に導く。流出液中にカテコールアミン、ビタ
ミンＣなど酸化され易い物質が溶出されてくると、両極
間に流れる電流は増加し、それらの物質が検出される。A constant voltage is applied between the electric lead wires 4 and 10 in accordance with the target component to be detected, and, for example, the effluent from a separation column of liquid chromatography is guided through the tube 9 to the working electrode tank. When easily oxidized substances such as catecholamines and vitamin C are eluted into the effluent, the current flowing between the two electrodes increases and these substances are detected.
ここで電解セル容器６および蓋７はアクリル樹脂で製作
したものであるが、電気絶縁性でしかもある程度に耐薬
品性があればポリカーボネート、タイボン。Here, the electrolytic cell container 6 and lid 7 are made of acrylic resin, but polycarbonate or Tybon may be used if they are electrically insulating and have a certain degree of chemical resistance.
テフロン等なんでもよい。またカーボンクロス２のかわ
りに多孔性金属を使用したり、また空気極の電気リード
を直接とるのであれば網でもウールでも空気を保持でき
、対極５を軽く押し刊けるものであれば何でも使用でき
ることはいうまでもない。さらに、作用電極１２には金
属網を使用することができる。Anything like Teflon is fine. In addition, porous metal can be used instead of carbon cloth 2, and if the electrical lead of the air electrode is directly connected, a net or wool can hold the air, and anything can be used as long as it can lightly push the counter electrode 5. Needless to say. Furthermore, a metal mesh can be used for the working electrode 12.
第２図は、本発明の電解セルの一使用形態を示す説明図
である。作用電極１２と空気極（対極）５との間に何ら
の電圧も印加しないで電流増幅器２１に直接接続し、そ
の出力を記録計２２に記録することを示している。これ
によれば、キノン類などとくに酸化され易い物質が選択
的に高感反（・こ検出される。FIG. 2 is an explanatory diagram showing one mode of use of the electrolytic cell of the present invention. This shows that the working electrode 12 and the air electrode (counter electrode) 5 are directly connected to the current amplifier 21 without applying any voltage between them, and the output thereof is recorded on the recorder 22. According to this, substances that are particularly easily oxidized, such as quinones, are selectively detected with high sensitivity.
以上述べたことから明らかなように、本発明によれば、
空気中の酸素を復極剤として用いることができるので特
殊な対極液など送液するポンプなしで流通式クーロメ）
ＩＪ−検出器（電気化学的検出器）を横地させること
ができるという効果を有する。As is clear from the above description, according to the present invention,
Oxygen in the air can be used as a depolarizing agent, so there is no need for a pump to pump a special counterelectrode, etc. (Flow-through type Coulome)
This has the effect that the IJ-detector (electrochemical detector) can be placed horizontally.
第１図は本発明による流通式定電位電解セルの一実施例
盆説明する模型的断…」図、第２図は上記実施例の一使
用形態を説明する回路図である。
１．１３・・・ゴム板、２・・・カーボンクロス、３．
３’・・・空気出入口、４，１０．１４・・・電気リー
ド給、５・・・空気極（対極）、６・・・パ１解セル答
器、７・・・電解セル蓋、８・・・・イオン変換膜、９
・・・試料液入口チューブ、１１・・・液排出用チュー
ブ、１２・・・作用電極（グラツシーカーボン布）。FIG. 1 is a schematic diagram illustrating an embodiment of a flow-through type constant potential electrolytic cell according to the present invention, and FIG. 2 is a circuit diagram illustrating one mode of use of the above embodiment. 1.13...Rubber plate, 2...Carbon cloth, 3.
3'...Air inlet/outlet, 4,10.14...Electric lead supply, 5...Air electrode (counter electrode), 6...P1 answer cell answerer, 7...Electrolytic cell lid, 8 ...Ion conversion membrane, 9
. . . Sample liquid inlet tube, 11 . . . Liquid discharge tube, 12 . . . Working electrode (glassy carbon cloth).
Claims (1)
しにくい対極と表面積の大きな作用電極とが対向配置さ
れた電解セルであって上記作用電極が収容された作用電
極槽内に被電解物質を含む液を流通させる定電位電解セ
ルにおいて、上記対極が空気極からなる流通式定電位電
解セル。 ２、上記空気極が空気を内部に保持できる多孔性の拐料
で上記隔膜に押しつけられている特許請求の範囲第１項
記載の流通式定電位電解セル。 ３、上記多孔性材料が電導性である特許請求の範囲第２
項記載の流通式定電位電解セル。[Scope of Claims] 1. An electrolytic cell in which a counter electrode that is difficult to polarize and a working electrode with a large surface area are arranged facing each other through a diaphragm through which conductive ions can pass during electrolysis, and the working electrode accommodates the working electrode. A flow-type constant potential electrolysis cell in which a liquid containing an electrolyte substance is passed through a tank, wherein the counter electrode is an air electrode. 2. The flow type constant potential electrolytic cell according to claim 1, wherein the air electrode is pressed against the diaphragm using a porous material capable of retaining air inside. 3. Claim 2, wherein the porous material is electrically conductive.
Flow-type constant potential electrolytic cell described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17831282A JPS5968662A (en) | 1982-10-13 | 1982-10-13 | Flow-system constant potential electrolytic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17831282A JPS5968662A (en) | 1982-10-13 | 1982-10-13 | Flow-system constant potential electrolytic cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5968662A true JPS5968662A (en) | 1984-04-18 |
Family
ID=16046272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17831282A Pending JPS5968662A (en) | 1982-10-13 | 1982-10-13 | Flow-system constant potential electrolytic cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5968662A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0326421A2 (en) * | 1988-01-29 | 1989-08-02 | Mitsui Engineering and Shipbuilding Co, Ltd. | An electroanalytical method |
-
1982
- 1982-10-13 JP JP17831282A patent/JPS5968662A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0326421A2 (en) * | 1988-01-29 | 1989-08-02 | Mitsui Engineering and Shipbuilding Co, Ltd. | An electroanalytical method |
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