Radiometric Polarography

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In 1958, D.L. Love reported the "New techique in radiochemical determinations using polarographic method", in which he used a polarographic cell shown in Fig. 1. Mercury is placed in the side arm containing the platinum electrode and the cell with the stopcock closed is filled with carbon tetrachloride to just below the mercury pool electrode. The active solution is placed above the carbon tetrachloride and in contact with the electrode. The D.M.E. is placed in the solution. The purpose of the large volume of carbon tetrachloride in the other compartment is to keep the solution-carbon tetrachlo-ride interface at a constant height when the drops fall through the solution and are removed by turning the stopcock. The radiometric polarography thus introduced was improved and developed by Love-Greendale, the authors, Chmelar et al., and several other investigators. The design of the electrolytic cell depends on the nature of solvent in which mercury drops are collected. Several kinds of cells are shown in Fig. 1, 4, 5, and 6. The methods of cleaning the mercury collected, the minimum concentrations of several nuclides and the precision of the radiometric polarography are discussed. The derivation of the equation of radioactivity-potential curve is carried out and the method of calibration is stated. Five examples reported by Love and Love-Greendale are abstracted; 1. 60Co, 2. 95Zr-95Nb, 3. 106Ru-106Rh, 4. 99mTc, 5. 113Sn-113mIn. Experiments on 65Zn and 198Tl reported by the authors are introduced. It is pos-sible to take quantitative radiometric polarogram on 2.4×10-11M-198Tl. Schaap Wild-man worked on 10-16M-204 Tl. Coulometry has intimate connection with the radiometric polarography. Two examples, i.e. on 60Co and radioactive silver are abstracted. On two systems of polarographic wave of catalytic nature, i.e. Th4+-NO3 and ZrO++-BrO3+ systems, had been investigated by the authors. In both cases no catalyser metal does not deposit on mercury electrode at the potentials at which the catalytic waves appear. Radiometric polarography on 60Co concerning the Brdicka catalytic wave of hydrogen is reviewed. The authors recognized an analogous formed cpm/t-E pattern of histidine to the ordinary polarogram, but both of the grams disappear on adding gelatin. Catalytic waves due to serum, cystine with gelatin or mecthylcellulose have cpm/t-E patterns which shows single wave of cobalt only and no catalytic peak form. Chmelar, Bfezina and Kalous29 worked out on the "radiopolarography" on 60Co concerning the Brdicka reaction, and recognized the cpm - E patterns on cobalt wave and catalytic hydrogen peak form wave. On addition of sufficient gelatin, the cpm/t-E pattern is reduced to the same pattern as wave of cobalt, though there is no effect on the ordinary polarogram. The authors seem that the reason of cpm/t-E pattern corresponding catalytic wave of hydrogen is reduced to the induced reduction of 60Co as can be seen at the potential of reduction of supporting electrolyte in many examples and as 95Zn deposition at cadmium and cobalt waves. Colléns technique of isotope separation of 6Li and 7Li is introduced. The method, like Love's radiometric polarography, makes use of carbon tetrachloride to cathodic mercury, which is streaming through the electrolytic solution of lithium chloride.
日本ポーラログラフ学会の論文

Radiometric Polarography

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