• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electrode arrangement with liquid-metal electrode of controllable surface, comprising a liquid-metal reservoir (23), a capillary connected thereto through a controllable valve and contact means being in electric contact with the liquid-metal in the capillary. According to the invention at least one section (18) of the capillary is formed within a metal body (19) not reacting chemically with the liquid-metal, said metal body (19) constituting the contact means. Preferably, the metal body (19) is formed so that an elastic closing element (25) of the valve fits to a surface (26) of the metal body (19) surrounding an opening of the capillary section (18) formed therein.
    公开号:SU1745140A3
    申请号:SU884356657
    申请日:1988-10-04
    公开日:1992-06-30
    发明作者:Надь Геза；Тарцали Йожеф；Пунгор Ерне；Тот Клара；Карпати Вероника；Фехер Жофия；Хорваи Дьердь；Шаркани Петер；Бокор Иштван
    申请人:Мадьяр Тудоманьош Академиа Кутаташ-Еш Сервезетэлемзе Интезете (Инопредприятие)；
    IPC主号:
    专利说明:

    one
    (21) 4356657/25
    (22) 10/4/88
    (31) 4464/87
    (32) 10/05/87
    (33) HU
    (46) 06/30/92. Bul M 24
    (71) Mady r Tudomanos academy Kutatash- yes servsetelemze intezete (HU)
    (72) Geza Nagy. Jozsef Tartsali. Erne Punghor. Clara Toth, Veronica Karpati, Zofi Feher, Gyorgy Horvai, Peter Sharkani and Istvan Bokor (HU)
    (53) 543.253 (088.8)
    (56) USSR author's certificate
    Mg 172112, cl. G 01 N 27/34, 1962.
    USSR author's certificate number 87091. class. G 01 N 27/34, 1944.
    Peperson V.M. and before. At.la5. (Fairfield Connecticut. USA), 1974. No. 12, p.69.
    (54) ELECTRODE ASSEMBLY WITH LIQUID METAL ELECTRODE (57) The invention relates to an electrode assembly with a liquid metal electrode having a controlled surface area, and can be used to determine the concentration of ions and molecules. The purpose of the invention is to improve the accuracy and reliability of measurements. This goal is achieved in that the device comprises a unit for forming a drop of liquid metal of a given area, a thermostating unit for the liquid metal and a thermostating unit for the measuring cell. 4 hp f-ly, 3 ill.
    The invention relates to an electrode assembly with a liquid metal electrode having a controlled surface area that can be used to determine the concentration of ions and molecules.
    For classical polarographic measurements, mercury electrodes are used, constantly evolving droplets under the influence of hydrostatic pressure. In addition to the positive properties of drop-mercury electrodes, they have some drawbacks. As a result of a constant change in the surface area of the droplet, a condensation current flows through the electrode, creating an interference signal. In addition, a so-called capillary effect occurs as a result of dropping. These phenomena acquire particular significance mainly with analytical measurements performed in the low concentration range, where they reduce the sensitivity and reproducibility of the experiments.
    To eliminate these interfering phenomena, a repeatedly updated mercury electrode was developed, which provides a constant surface area during the experiments. This solution has significantly increased the efficiency of polarographic methods. Due to its development, it was possible to ensure a constant size of the mercury drop during measurements. Thus, the condensation current, appearing due to changes in surface area and interfering, no longer appears. It was possible to prevent an effect on the droplet size from the side of the electrode H SL
    Ј o
    with
    potential due to the effect on the surface tension. The size of the drop and its useful lifetime can vary over a very wide range. Such electrode assemblies are performed with needle or poppet valves.
    In the known electrode assembly having a disc valve, the overall structure is the same as in the assembly with a needle valve. In this case, the glass capillary is also connected to the mercury tank, however, the end of the capillary, facing the tank, is closed with a poppet valve including a closing element made of rubber. The disc valve is also actuated by a spring and an electromagnet. An annular film of conductive tin dioxide deposited on the surface of a glass capillary that interacts with the valve plate and faces the tank with mercury forms an electrical contact between the input line of the measuring device and a drop of mercury.
    The main reason for the drawbacks of the prototype is the use of a tin dioxide film as an electrical conductor. Tin dioxide is chemically unstable, in use it becomes inhomogeneous as a result of decomposition, its resistance increases and therefore it becomes unreliable as an electrical conductor. Another disadvantage is that the thin film simply wears out in a relatively short period of time due to movements of the closing element. which conductivity disappears. Another disadvantage of the known solution is that the sulfur, which is a component of the rubber from which the closure element of the poppet valve is made, reacts with mercury and contaminates it. In addition, the temperature of the mercury used as the electrode varies depending on the effects of the environment and at the same time the value of the Farad current, which is the measured signal, also changes, resulting in a reduced reproducibility of the measurements. The disadvantage is that, as an electrode material, only a metal that is in a liquid state at room temperature, i.e., can be used. mercury.
    The purpose of the invention is to improve the accuracy and reliability of measurements.
    Figure 1 shows the structure of the device; Figure 2 shows the structure of a metal electrode; FIG. 3 shows the construction of a measuring cell and a liquid metal electrode, section A-A in FIG.
    The device comprises a base 1 to which measuring cell 3 is attached by means of a holder 2 into which the liquid metal electrode 4 is immersed, a reference electrode 5, an auxiliary
    electrode 6. At the base there is a container 7 for liquid metal and a drop-splash 8, and the container 7 for liquid metal is connected to the liquid metal electrode 4 by means of a pipe 9. The liquid metal electrode 4 (figure 2) contains a reservoir 10 for liquid metal, to the bottom which through the closing element 11 of silicone rubber attached metal body 12,
    pressed to the tank 10 by the end nut 13. A capillary hole 14 is made in the metal body, into which a glass capillary 15 is inserted. A rod passes through the tank 10 for liquid metal
    valve 16, which rests on the lower end of the closing element 11, and the upper end is fixed in the electromagnetic coil 17, fixed by means of a holder 18 in the upper part of the tank 10 dl
    liquid metal. To adjust the stroke of the valve stem 16, a spring 19 is installed in its upper part, the compression of which is adjusted by adjusting screws 20 and 21. The reservoir 10 is for liquid
    the metal is divided by a guide disk 22 in which holes are made for moving the liquid metal and the valve stem 16. The contact area of the metal body 12 and the valve stem 16 is placed in a thermostatic unit 23 with a heating element 24 and a temperature sensor 25. In this case, the thermostatic unit is placed in the reservoir 10 for the liquid metal. The measuring cell 3 is placed in a thermostatic unit 26 with a heating element 27 and a temperature sensor 28. The measuring cell 3 is closed by a lid 29. A droplet spreader 8 is attached to the body 1 or to the glass capillary 15, consisting of a pusher 30. an electromagnetic coil 31 and a spring 32. The electrodes 4-6 are electrically connected to the measuring device 33. Thermostatic blocks 23 , 26 and electromagnetic coils
    17 and 31 are electrically connected to the control device 34, and the blocks 33 and 34 together with the data processing and control device form an electronic unit 35.
    The device works as follows.
    The sample to be analyzed is poured into the measuring cell 3, covered with a lid 29, electrodes 4-6 are immersed, the sample is thermostated using a thermostating unit 26. The liquid metal placed in the tank 10 is thermostatted using a thermostating unit 23. After thermostating the sample and the liquid metal block 34 generates a command to lift the valve stem 16 and the liquid metal, flowed through the capillary 15, acts as a drop at the end of the liquid metal electrode 4. The action of the spring 19 and the adjusting screws 20 and 2 1, the droplet area can be controlled. In order to drop a drop, the regulating unit 34 generates a command to turn off the electromagnetic coil 31 and, by the action of the spring 32, the pusher 30, hit the glass capillary 15, drops a drop of liquid metal. The measurement cycle is repeated. The level of the liquid metal in the tank 10 is maintained by the flow of the liquid metal from the tank 7 through the nozzle 9. The signals received by the block 33 are the basis for the block 35 to generate the signals of the block 34.
    The device allows you to increase the measurement time, use other metals besides mercury.
    权利要求:
    Claims (5)
    [1]
    Claim 1. Electrode assembly with a liquid metal electrode having a controlled surface area, containing a reservoir with liquid metal to which a glass capillary, which is lowered into an electrically controlled valve with a rubber closing element, is connected to
    a measuring cell equipped with a reference electrode, and an electronic unit, with the fact that, in order to increase the accuracy of analysis and reliability of the device, it additionally contains a body made of a metal that is not chemically interacting with the liquid metal, in which At least one capillary channel with an internal diameter of 200 to 600 µm, the body being installed in contact with a valve element made of silicone rubber in the upper end, a glass capillary with internal fibers is inserted into the capillary channel in the body the morning diameter is from 50 to 300 microns, and the zone of contact of the body and the tank with the liquid metal is placed in a thermostat electrically connected to the electronic unit.
    [2]
    2. Assembling according to claim 1, about tl and h and y and the fact that the measuring cell is placed in
    additional thermostatic unit electrically connected to the electronic unit.
    [3]
    3. Assembly according to claim 1, characterized in that it is additionally inserted into a drip jaw made in the form of a pusher connected to an electromechanical device electrically connected to the electronic unit and mechanically attached to the body or to the glass capillary.
    [4]
    4. Assembly according to claim 1, characterized in that it additionally contains a container with a liquid metal, hydraulically connected to a reservoir for the liquid metal.
    [5]
    5. Assembly according to claim 1, characterized in that the electronic unit contains a system for supplying a constant electric
    potential on the liquid metal electrode.
    and
    OP9t
    A-l
    26
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    同族专利:
    公开号 | 公开日
    DK555188A|1989-04-06|
    HUT48028A|1989-04-28|
    US4939410A|1990-07-03|
    EP0310927A3|1991-02-06|
    DD282988A5|1990-09-26|
    DK555188D0|1988-10-04|
    HU198795B|1989-11-28|
    EP0310927A2|1989-04-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3579011A|1969-01-08|1971-05-18|Hughes Aircraft Co|Liquid metal cathode with single capillary flow impedance|
    US4260467A|1978-01-26|1981-04-07|Princeton Applied Research Corporation|Static drop mercury electrode|US4846955A|1988-03-08|1989-07-11|The Research Foundation Of State University Of New York|Controlled-growth mercury drop electrode|
    PL288902A1|1990-01-31|1991-10-07|Ladislav Novotny|Method of making a miniature pic-up and apparatus therefor|
    US5578178A|1995-03-06|1996-11-26|Analytical Instrument Systems, Inc.|Mercury drop electrode system|
    US5957167A|1997-12-18|1999-09-28|Pharmacopeia, Inc.|Article for dispensing small volumes of liquid|
    FR2862239B1|2003-11-14|2007-11-23|Commissariat Energie Atomique|DEVICE FOR RECEIVING A SAMPLE OF FLUID, AND ITS APPLICATIONS|
    CN102253106B|2011-06-30|2014-02-12|中南大学|Device and method for multi-component online polargrafic detection of metallurgical feed liquid|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    HU874464A|HU198795B|1987-10-05|1987-10-05|Arrangement of electrodes with liquid-metal electrode with surface regulation|
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