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Application of an automatic titrator to sewage analysis.
A 84
Jownal
of Electroanalytical
Chemistry
Vol. 1
12691 CONDUCTIVITY METER WITHOUT ELECTRODES. M.Salamon. (Acetylene Chemical Research Institute, Novaky, Czechoslovakia.) Acta Imeko, 4 (1959) 401. The polarization and corrosion of electrodes, as well as the coatings which form on the electrodes, may cause difficulties in the continuous industrial measurement of conductivity with electrodes. The conductivity meter described functions without electrodes at mains frequency. An inductive coupling was applied between the electrolyte and the measuring instrument and the error caused by the temperature change of the electrolyte was eliminated by compensation. In its present form the instrument is suitable for measuring the conductivity of electrolytes which have a specific resistance smaller than 35 Ohm cm, with an accuracy better than 1%. E. Juh. t2791 APPLICATION OF AN AUTOMATIC TITRATOR TO SEWAGE ANALYSIS. J.C. Crowther. (The Houldsworth School of Applied Science, University of Leeds, Great Britain.) Chemistry & Industry, (1959) 327. The use of a Pye automatic titrator for the potentiometric titration of sewage effluents is described. Modifications were made to the burette and stirrers to prevent overshooting the end-point. D. S. Ru. t27Il THE BEHAVIOUR OF PLATINUM ELECTRODES. I. DISINTEGRATION OF THE PLATINUM ANODE IN ACID SOLUTION. AtusiMituya and Takeko Obayashi. (Dept. of Chemistry, St. Paul’s University (Rikkyo Daigaku), Tokyo, Japan. ) J. Research Inst. Catalysis, 7 (1959) 10. Disks of neutron-activated Pt were placed in a special electrolytic cell (see original text) and submitted to electrolysis with and without anodic polarization. From the gamma-ray spectra of the resulting solutions, the authors show that: (1) neither the metal nor its impurities dissolve or disintegrate in 0.1 N HCl under anodic electrolysis without polarization; (2) with an anodic polarization of 25 mV, only surface impurities go into solution, and (3) with an anodic polarization of 50 mV, an anode previously purified from its impurities does not dissolve or disintegrate. It is concluded that the objections of Frumkin to a previous work of Mituya can be rejected. Ca. Cas. [2721 SUB-MICROGRAM-SCALE TENTIAL. Louis Meites. U.S. A.) Anal. Chim. Acta,
ANALYSIS BY COULOMETRY AT CONTROLLED PO(Polytechnic Institute of Brooklyn, Brooklyn, N.Y., 20 (1959) 456.
The considerations which determine the success of controlled potential coulometric analyses on the sub-microgram level are discussed. It is shown that the ultimate sensivity of the method is governed by the accuracy with which the reQ f.i , quisite background corrections (sum of Qc, charging quantity of electricity, faradaic impurity quantity of electricity and Q f. c, , continuous farrrdaic quantity of electricity) can be determined. A method for the coulometric determination of Zn based on these considerations is shown to contain a limiting uncertainty of &-0.2 mu F, so that as little as 0.07 pg of Zn can be determined within about rt lo%, while quantities of Zn exceeding about 10 ug can be determined with an accuracy and precision off 0.1% or better. Possible techniques for the further extensionof controlled-potential coulometric analysis into the millimicrogram range are briefly discussed. P. Me.
Jownal
of Electroanalytical
Chemistry
Vol. 1
12691 CONDUCTIVITY METER WITHOUT ELECTRODES. M.Salamon. (Acetylene Chemical Research Institute, Novaky, Czechoslovakia.) Acta Imeko, 4 (1959) 401. The polarization and corrosion of electrodes, as well as the coatings which form on the electrodes, may cause difficulties in the continuous industrial measurement of conductivity with electrodes. The conductivity meter described functions without electrodes at mains frequency. An inductive coupling was applied between the electrolyte and the measuring instrument and the error caused by the temperature change of the electrolyte was eliminated by compensation. In its present form the instrument is suitable for measuring the conductivity of electrolytes which have a specific resistance smaller than 35 Ohm cm, with an accuracy better than 1%. E. Juh. t2791 APPLICATION OF AN AUTOMATIC TITRATOR TO SEWAGE ANALYSIS. J.C. Crowther. (The Houldsworth School of Applied Science, University of Leeds, Great Britain.) Chemistry & Industry, (1959) 327. The use of a Pye automatic titrator for the potentiometric titration of sewage effluents is described. Modifications were made to the burette and stirrers to prevent overshooting the end-point. D. S. Ru. t27Il THE BEHAVIOUR OF PLATINUM ELECTRODES. I. DISINTEGRATION OF THE PLATINUM ANODE IN ACID SOLUTION. AtusiMituya and Takeko Obayashi. (Dept. of Chemistry, St. Paul’s University (Rikkyo Daigaku), Tokyo, Japan. ) J. Research Inst. Catalysis, 7 (1959) 10. Disks of neutron-activated Pt were placed in a special electrolytic cell (see original text) and submitted to electrolysis with and without anodic polarization. From the gamma-ray spectra of the resulting solutions, the authors show that: (1) neither the metal nor its impurities dissolve or disintegrate in 0.1 N HCl under anodic electrolysis without polarization; (2) with an anodic polarization of 25 mV, only surface impurities go into solution, and (3) with an anodic polarization of 50 mV, an anode previously purified from its impurities does not dissolve or disintegrate. It is concluded that the objections of Frumkin to a previous work of Mituya can be rejected. Ca. Cas. [2721 SUB-MICROGRAM-SCALE TENTIAL. Louis Meites. U.S. A.) Anal. Chim. Acta,
ANALYSIS BY COULOMETRY AT CONTROLLED PO(Polytechnic Institute of Brooklyn, Brooklyn, N.Y., 20 (1959) 456.
The considerations which determine the success of controlled potential coulometric analyses on the sub-microgram level are discussed. It is shown that the ultimate sensivity of the method is governed by the accuracy with which the reQ f.i , quisite background corrections (sum of Qc, charging quantity of electricity, faradaic impurity quantity of electricity and Q f. c, , continuous farrrdaic quantity of electricity) can be determined. A method for the coulometric determination of Zn based on these considerations is shown to contain a limiting uncertainty of &-0.2 mu F, so that as little as 0.07 pg of Zn can be determined within about rt lo%, while quantities of Zn exceeding about 10 ug can be determined with an accuracy and precision off 0.1% or better. Possible techniques for the further extensionof controlled-potential coulometric analysis into the millimicrogram range are briefly discussed. P. Me.