Browsing by Author "Florence, TM"

Now showing 1 - 8 of 8
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    Comparative survey of methods for the determination of uranium in ores
    (Australian Atomic Energy Commission, 1972-08) Florence, TM; Pakalns, P; Dale, LS
    Results are given for an inter-laboratory comparison of methods for the determination of uranium in ores. Four different uranium ores were carefully prepared and samples distributed to eleven participating laboratories. The ores were analysed by several techniques, including spectrophotometric, fluorimetric, X-ray fluorescence, radiometric, and titrimetric procedures. Statistical analysis of the results showed that there was no significant difference between the uranium values found using spectrophotometric, fluorimetric, or X-ray fluorescence methods. An Appendix contains some suggested modifications to the A.A.E.C. bromo-PADAP spectrophotometric method.
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    Direct determination of uranium in concentrates by spectrophotometric titration with ferric sulphate.
    (Australian Atomic Energy Commission, 1959-12) Florence, TM
    A direct method is presented for the determination of uranium in uranium concentrates by spectrophotometric titration with ferric sulphate, after a bismuth amalgam reduction. The oxidation of U (IV) by Fe (III) was found to be rapid and complete at room temperature, under suitable conditions. Copper, molybdenum and vanadium interfere to some extent, and their maximum permissible concentrations are discussed. A complete determination may be carried out in little over an hour with a precision of two to three parts per thousand. A "Uvispek" spectrophotometer was adapted for spectrophotometric titrations without modification of the instruments.
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    Estimation of traces of nickel in sodium metal.
    (Australian Atomic Energy Commission, 1958-02) Florence, TM
    A simple and sensitive method is described for the determination of traces of nickel in sodium metal. The nickel is complexed with potassium cyanide and the absorption measured spectrophotometrically at 268 mµ. Interference of iron and chromium is removed by precipitation of the hydroxides from homogeneous solution. This method should be applicable to a wide range of materials.
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    Quantitative studies in complex chemistry. Part 1 electrometric methods
    (Australian Atomic Energy Commission, 1961-07) de Bruin, HJ; Florence, TM
    Methods for the determination of stability constants are considered with particular reference to the method of pH titration. Mathematical derivations proposed by several authors are discussed and rationalised by using a common symbolism. The use of acid association constants is advocated in preference to dissociation constants. The authors' current work on the beryllium/oxalate system is used to illustrate the methods. Suggestions are made for the application of the fundamental data to problems in chemical processing and analytical chemistry.
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    Rapid determination of aluminium in beryllium metal by cathode ray polarography
    (Australian Atomic Energy Commission, 1961-07) Florence, TM; Izard, DB
    A rapid method is presented for the determination of aluminium in beryllium metal by cathode ray polarography using the dye Superchrome Garnet Y. A mercury cathode electrolysis is used to remove heavy metal impurities, but the need for a separation of aluminium from beryllium is avoided. A single determination requiring a 100 mg sample may be completed in little over an hour, with normal polarographic precision.
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    A rapid routine method for the determination of sub-microgram and microgram amounts of beryllium in filter paper
    (Australian Atomic Energy Commission, 1958-10) Florence, TM
    A rapid routine method for the determination of sub-microgram and microgram amounts of beryllium in filter paper smears is presented. Beryllium is determined fluorometrically with 3:5:7:2':4' - pentahydroxyflavone (MORIN). Many interfering elements are removed by adsorption on a strongly basic anion-exchange resin from 9M hydrochloric acid.
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    A specific method for the determination of uranium in ores by cathode ray polarography
    (Australian Atomic Energy Commission, 1959-04) Florence, TM
    A method is presented for the specific determination of uranium in ores by cathode ray polarography. The uranium is separated by a simple and rapid mercury-cathode electrolysis, then determined polarographically in a base electrolyte in which vanadium, titanium and tungsten do not interfere. Application of the method to the analysis of tens standard uranium ores is shown.
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    Spectrophotometric determination of calcium with glyoxal bis (2-hydroxy-anil)
    (Australian Atomic Energy Commission, 1961-03) Florence, TM; Morgan, J
    A selective method is described for the spectrophotometric determination of calcium using glyoxal bis (2-hydroxy-anil) as chromogenic agent. A comprehensive study of interferences and reagent variables is given.