SU1002943A1

SU1002943A1 - Stationary indicator electrode for oxygen determination

Info

Publication number: SU1002943A1
Application number: SU813387013A
Authority: SU
Inventors: Яков Иосифович Турьян; Юрий Алексеевич Чирков; Геннадий Леонидович Лошкарев; Николай Константинович Стрижов
Original assignee: Всесоюзный Научно-Исследовательский И Проектный Институт По Переработке Газа; Краснодарский ордена Трудового Красного Знамени политехнический институт
Priority date: 1981-11-02
Filing date: 1981-11-02
Publication date: 1983-03-07

Description

1one

Изобретение относитс к электрохимическим методам анапиза, а именно к пол рографическому определению кислорода, Известны пол рографические чейки со стационарным индикаторным электродом , в которых электрод выполнен из ртути 1.The invention relates to anapic electrochemical methods, namely to the polarographic determination of oxygen. Polarographic cells with a stationary indicator electrode are known, in which the electrode is made of mercury 1.

. Известные пол рографические чейки со стационарным ртутным электродом требуют строгого соблюдени требований техники безопасности при работе со ртутью (выт жной шкаф, вентил ци , линопеумный пол, герметичность конструкции чейки и др.). Концентраци ртути в воздухе при 25°С над поверхностью ртути составл ет 0,65 мг/м, тогда как предельно- допустима концентраци (ПДК) ртути в воздухе рабочей зоны лаборатории , составл ет 0,01 мг/м. Дл исключени работы со ртутью были предложены чейки с твердыми индикаторными электродами . Однако такие электроды, по сравнению со ртутным, ввиду нестабильности физического и химического состо ни поверхности привод т к низкой вое - производимости результатов анализа.. The well-known polarized cells with a stationary mercury electrode require strict observance of the safety requirements for working with mercury (hood, ventilation, linopead floor, tightness of the cell design, etc.). The mercury concentration in air at 25 ° C above the mercury surface is 0.65 mg / m, while the maximum permissible concentration (MAC) of mercury in the air of the laboratory's working area is 0.01 mg / m. To eliminate mercury, cells with solid indicator electrodes have been proposed. However, such electrodes, as compared with mercury, due to the instability of the physical and chemical state of the surface, lead to a low degree of performance of the analysis results.

Наиболее близким к изобретению вл етс стационарный индикаторный электрод дл определени кислорода на основе ртути С2 .Closest to the invention is a stationary indicator electrode for the determination of oxygen based on mercury C2.

Однако вследствие применени ртути в качестве индикаторного электрода необходимы специальные меропри ти , предотвращающие попадание паров ртути в атмо. However, due to the use of mercury as an indicator electrode, special measures are needed to prevent mercury vapor from entering the atmosphere.

10 сферу.10 sphere.

Целью изобретени вл етс снижение токсичного воздействи на окружающую среду и сохранени при этом воопроизводимой поверхности электрода.The aim of the invention is to reduce the toxic effects on the environment and at the same time preserve the surface of the electrode produced.

1515

Поставленна цель достигаетс тем, что в стационарном индикаторном электроде дл определени , кислорода на основе ртути, индикаторный электрод выполнен из (2 + 0,1)%-ной амальгамы инди ..The goal is achieved by the fact that in a stationary indicator electrode for the determination of mercury-based oxygen, the indicator electrode is made of (2 + 0.1)% india amalgam.

Claims

Replacing a mercury electrode with an indium amalgam electrode reduces the partial pressure of mercury vapor and its concentration in the air of the working area of the cell to the limits of its MAC value. Consequently, the mercury exposure to the environment is reduced and the compliance with the requirements of the safety technique is improved. During the test, it was found that the electrode otsyaetsya liquid and does not change its surface during the analysis, i.e. Positive properties inherent in mercury electrode are maintained. Fig, 1 shows the proposed device; in fig. 2 - calibration charts for polarographic determination of the content of 0, O1 - 0.2% by volume of oxygen in argon under the same conditions with a stationary mercury electrode (direct 1) and a stationary electrode 1 of 2% ary indium amalgam (right 2 ); in fig. 3 is a graph of mercury content in air versus indium content in amalgam. The polarographic cell 1 contains a stationary indicator electrode 2 an electrode of reference 3 and a pipe 4 for supplying g for. Electrode 2 is made of 2% indium amalgam. Polygraphic cell works as follows. Cell 1 is filled with electrolyte, a certain potential relative to reference electrode 3 is installed on the cTatmoHapHOM electrode 2 from an external voltage source. The tube 4 serves the analyzed gas to the stationary electrode 2. Proportionally to the content of the electrochemically active component being analyzed, the component in the circuit generates a current, which is fixed. / m3 and reaches a minimum O value of 02 mg / m with a peak value of indium content in the amalgam of 2%. Even with a slight deviation from this peak, the elasticity of mercury vapor in the air begins to grow. The use of the proposed indicator electrode for the determination of oxygen reduces the toxicity of the analysis and improves the working conditions in production. Claims of the invention A stationary indicator electrode for the determination of oxygen based on mercury, characterized in that, with a circuit for reducing the toxic environmental impact and at the same time maintaining a reproducible electrode surface, the indicator electrode is made of (2 + 0.1)% indium amalgam. Sources of information taken into account in the examination 1. Geyrovsky I, Ruta Ya. Fundamentals of se rography. M., Mtip, 1965, “p. 41

2. Patent Czechoslovakia No. 88282, cl. G, O1N 27/48, publ. 1959.