This series of monographs has grown out of the need for up-to-date compilations of ra.biochemical information end procedures. The Subcommittee has endeavored to present a series which will be of maximm use to the working scientist and which contatis the latest available information. Each monograph collects h one volume the pertinent information required for radiochemlcal work with an individual element or a group of closely related elements. An expert h the radiochemistry of the particular element has written the monograph, following a standard format developed by the Subcommittee. The Atoml.c Energy Commission has sponsored the printing of the series, The Subcommittee is confident these publications will be usefti not only to the radiochemlst but also to the research worker 'in other fields such as physics, biochemistry or medicine who wishes to use radiochemlcal techniques to solve a specific problem. W. Wayne Meinke, Chairman Subcommittee on Radiochemistry iii 6 Interest to Radiochemists General Properties Cesium Metal Halides Oxides Hydroxide Cesium Permanganate Chromate Permolybdate Sulfates Polysulfides Nitrogen Compounds Salts of Oxides of Phosphorous Carbonate Analytical Methods 6 6 8 19 IV. Dissolution of Samples Containing Compounds of Ces ium v. Counting Techniques Eor Use with Isotopes of Cesium 29 VI. Applications of Radioisotopes of Cesium 32 VII. Collection of Detailed Radiochemical Procedures 35 for Cesium TABLES I. Atomic and Physical Pro~erties of Cesium 7 v II. Properties of Cesium Halides III. Properties of Ceeium Pemanganate IV. Precipitation Metlmda v. Carrier-Free Methoda VI. Ion Exchange and Chranatographic Methoda VII.
It emerges from previous investigations that chromate forms complexes with both oxalic acid (and other dicarboxylic acids and hydroxycarboxylic acids) and alcohols, an important role in this being played by the presence of the nondissociated OH group. It appears that it is the redox transformation of the complex formed in the course of the condensation that leads to the mutual increase in the rates of the reactions, the oxalic acid too meanwhile being consumed. In contrast, if one of the substrates is not attached in this way (e.g. in the cases of iodide and thiocyanate ions), the oxalic acid consumption is not observed, but the rate of oxidation of the substrate increases considerably. In this case, the induction turns into catalysis ( 14).An explanation is required for the finding that a plot of the reciprocal of the reaction time necessary for attainment of a given conversion vs. the alcohol concentration yields a satisfactory straight line over a relatively wide alcohol concentration interval. The cause of this is probably the fact that the single-step three-electron oxidation (step 2) is the ratedetermining process, and further that identical amounts of "chromate" are consumed in the reaction by measurement of the change in the chromate concentration up to not too high conversions.
Excess enthalpies for the ternary systems 1-propanol-acetonitrile-benzene and 2-propanol-acetonitrlle-benzene and for the constituent binaries I-propanol-acetonitrile and 2-propanol-acetonitrile were measured at 25 O C by an Isothermal dilution Calorimeter. The experimental data were correlated by means of the association model of Nagata and Tamura, based upon mole fraction statistics.
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