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Galvanic cells sensitive to gaseous, liquid and solid substances (in French).
A 70
Journal
of Electroanalytical
Chemistry
VOL.
1
12251 QUANTITATIVE ANODIC CHRONOPOTENTIOMETRY AT THE PLATINUM ELECTRODE. J. D. Voorhies and J, S. Parsons. (Research Div., American Cyanamid co. , Bound Brook, N. Y., U.S.A.) Anal. Chem., 31 (1959) 516. The application of quantitative anodic chronopotentiometry at a platinum electrode to the analysis of 2-mercapto-benzothiazole (I) and toluene-2,4-diamine (II) is described. The influence of the pretreatment and shape of the electrode is discussed. The chronopotentiometric cell is a polarographic H-type cell modified with a ground-glass joint for insertion of a plug electrode in the bottom. Current electrodes are made of platinum wire fitted into teflon plugs. A block diagram of the apparatus is given. Solutions of (I) are deaerated in a borate buffer or in a phosphate buffer if (II) is analysed. The length of a run is about 5 minutes. Deviation is about 1% in a concentration range of 0.8 to.1.1 - 10T2 M. Kl. Gr. 12261 EINE DIELEKTRISCHE SPEZIALMESSZELLE FUR KLEINE SUBSTANIMENGEN. F. Oehme. Mitteilg. Inst. Entwicklg. Chem. -physikal. Analysen-Meth., Weilheim/ Obb., 111/1959, 67. Measurements of dielectric constants and dielectric losses are usually carried out in the frequency range upto 100 mc/sec, mostly with capacitive cells. Normally these cells have to be filled with about 5 to 15 ml of substance. The determination of dielectric figures of rare substances was handicapped by this large amount. The new cell of the type MFL l/m (WTW Weilheim/Obb.) only requires 0.5 ml of substance. It consists of a cylindrical condenser (nickel or gold plated) with an insulating jacket. A high class ceramic insulation of the hot electrode and a teflon packing provide excellent electric and anti-corrosive properties. The cell can be filled from below by the aid of a syringe or by connecting the cell to a continuous stream by means of a special capillary ground. Applications of the cells for controlling the elution of chromatographic columns and the distillation of small amounts of liquids are described. Fr. Oe.
w71 GALVANIC CELLS SENSITIVE TO GASEOUS, LIQUID AND SuLID SUBSTANCES (in French). A. Berton. (Centre Nationale de la Recherche Scientifique). Chim. anal. , 41 (1959) 351. An “aerialf’ galvanic cell (“osmopile”) is described which is sensitive to variations in the composition of the surrounding atmosphere. The cell is a liquid drop, supported by a ring and placed between two different electrodes (e.g. , Pb - H2C, Pt) .
The current intensity of the cell is measured when the cell is immersed in certain gases, vapours or aerosols which are soluble in the liquid drop and thus the composition of the liquid between the electrodes is changed. The liquid is water for ionisable substances, or oxydants, etc. when dissolved samples have to be transformed in order to produce a useful difference of the electrodes potentials. By this method it is possible to detect 0.1 - 1 p. p. m. of foreign gas in the air. In the paper some theoretical considerations are reported together with the cell description, some of its main applications to the analysis of substmces dissolved or dispersed in tne air and its use as a detector at the end of $is-chrumatographic columns. G. de .\n.
[2281
DETERMINATION OF NITRATE IONS IN MIXED ACIDS AND NITKIC ESTERS BY ELECTROMETRIC PROCEDURES. W. C. Easterbrook. (Research Dept. , Imperial Chemical Industries Limited, Stevenston, Ayrshire, Scotland. ) J. Appl. Chem. 9 (1959) 410.
Journal
of Electroanalytical
Chemistry
VOL.
1
12251 QUANTITATIVE ANODIC CHRONOPOTENTIOMETRY AT THE PLATINUM ELECTRODE. J. D. Voorhies and J, S. Parsons. (Research Div., American Cyanamid co. , Bound Brook, N. Y., U.S.A.) Anal. Chem., 31 (1959) 516. The application of quantitative anodic chronopotentiometry at a platinum electrode to the analysis of 2-mercapto-benzothiazole (I) and toluene-2,4-diamine (II) is described. The influence of the pretreatment and shape of the electrode is discussed. The chronopotentiometric cell is a polarographic H-type cell modified with a ground-glass joint for insertion of a plug electrode in the bottom. Current electrodes are made of platinum wire fitted into teflon plugs. A block diagram of the apparatus is given. Solutions of (I) are deaerated in a borate buffer or in a phosphate buffer if (II) is analysed. The length of a run is about 5 minutes. Deviation is about 1% in a concentration range of 0.8 to.1.1 - 10T2 M. Kl. Gr. 12261 EINE DIELEKTRISCHE SPEZIALMESSZELLE FUR KLEINE SUBSTANIMENGEN. F. Oehme. Mitteilg. Inst. Entwicklg. Chem. -physikal. Analysen-Meth., Weilheim/ Obb., 111/1959, 67. Measurements of dielectric constants and dielectric losses are usually carried out in the frequency range upto 100 mc/sec, mostly with capacitive cells. Normally these cells have to be filled with about 5 to 15 ml of substance. The determination of dielectric figures of rare substances was handicapped by this large amount. The new cell of the type MFL l/m (WTW Weilheim/Obb.) only requires 0.5 ml of substance. It consists of a cylindrical condenser (nickel or gold plated) with an insulating jacket. A high class ceramic insulation of the hot electrode and a teflon packing provide excellent electric and anti-corrosive properties. The cell can be filled from below by the aid of a syringe or by connecting the cell to a continuous stream by means of a special capillary ground. Applications of the cells for controlling the elution of chromatographic columns and the distillation of small amounts of liquids are described. Fr. Oe.
w71 GALVANIC CELLS SENSITIVE TO GASEOUS, LIQUID AND SuLID SUBSTANCES (in French). A. Berton. (Centre Nationale de la Recherche Scientifique). Chim. anal. , 41 (1959) 351. An “aerialf’ galvanic cell (“osmopile”) is described which is sensitive to variations in the composition of the surrounding atmosphere. The cell is a liquid drop, supported by a ring and placed between two different electrodes (e.g. , Pb - H2C, Pt) .
The current intensity of the cell is measured when the cell is immersed in certain gases, vapours or aerosols which are soluble in the liquid drop and thus the composition of the liquid between the electrodes is changed. The liquid is water for ionisable substances, or oxydants, etc. when dissolved samples have to be transformed in order to produce a useful difference of the electrodes potentials. By this method it is possible to detect 0.1 - 1 p. p. m. of foreign gas in the air. In the paper some theoretical considerations are reported together with the cell description, some of its main applications to the analysis of substmces dissolved or dispersed in tne air and its use as a detector at the end of $is-chrumatographic columns. G. de .\n.
[2281
DETERMINATION OF NITRATE IONS IN MIXED ACIDS AND NITKIC ESTERS BY ELECTROMETRIC PROCEDURES. W. C. Easterbrook. (Research Dept. , Imperial Chemical Industries Limited, Stevenston, Ayrshire, Scotland. ) J. Appl. Chem. 9 (1959) 410.