Cecil L. Wilson

Some aspects of the polarographic behaviour of technetium and rhenium

The oxidation-reduction behavior of technetium was investigated polarographically by means of ultramicro methods. Rhenium was examined as a control and a guide. The behavior of technetium was found to be similar to that of rhenium more than to that of manganese. (C.J.G.)

The separation and identification of manganese, technetium, rhenium, ruthenium and molybdenum on the ultramicroscale

Abstract A scheme is presented for the separation and detection of manganese, technetium, rhenium, ruthenium and molybdenum on the ultramicroscale. A number of comfirmatory tests for these elements on this scale have been investigated and the results are reported. A survey of reagents suitable for the approximate estimation of technetium, rhenium and molybdenum has been carried out and these are combined in a separation scheme for these elements.

Spectrophotometric studies on technetium and rhenium

Abstract The behaviour of technetium and rhenium with three reagents, potassium ferrocyanide, sulphosalicylic acid, and α-picolinic acid is discussed. With the first reagent, technetium and rhenium in the presence of bismuth amalgam or stannous chloride, form coloured solutions which show maximum absorption at widely different wavelengths, thus permitting the spectrophotometric determination of both elements in the presence of one another. As little as 2 μg of technetium can be determined by this method. Sulphosalicylic acid with pertechnetate which has been reduced with stannous chloride produces an orange-red coloration suitable for the determination of the element. The method has the advantage that the element can be determined in the presence of fairly large amounts of rhenium, manganese and molybdenum. When pertechnetate is reduced with ascorbic acid, α-picolinic acid yields a yellow-red solution which provides a sensitive method for the spectrophotometric determination of the element. The types of complex formed with the reagents are discussed.

The analytical chemistry of the pyridine thiocyanates—III: The separation of rhodium, palladium and platinum

Abstract A procedure is described for the separation and subsequent colorimetric determination of rhodium, palladium and platinum through the formation of complex and ammine-type thiocyanates, using solvent extraction. Suggestions are put forward as to the nature of the complexes in solution.

Mixed chemiluminescent indicators

Abstract A 1:1 molar mixture of luminol and fluorescein in the presence of hydrogen peroxide has been shown to be a sensitive and reversible chemiluminescent indicator for acid-base titrations. The role played by the fluorescein and luminol is discussed.

The analytical chemistry of the pyridine thiocyanates—II: The separation of ruthenium and palladium

Abstract A procedure is described for the separation and subsequent colorimetric determination of ruthenium and palladium as complex and ammine-type thiocyanates respectively, using solvent extraction. Suggestions are put forward as to the nature of the ruthenium complex occurring in solution.

A systematic scheme for the identification of polyatomic anions by infrared spectroscopy

Abstract Using infrared absorption spectroscopy, a systematic scheme has been established for the identification of the following 16 anions: ferrocyanide, ferricyanide, thiocyanate, arsenite, periodate, salicylate, benzoate, bromate, iodate, silicate, oxalate, tartrate, phosphate, arsenate, chromate and sulphate.

Chemiluminescence of luminol and haemin

Abstract A study of the luminescence of haemin-luminol mixtures has shown that haemin is a chemiluminescent material, and a mechanism is proposed for the haemin-luminol reaction. The course of the reaction depends on the relative concentrations of the components and the alkalinity of the solution.

Inclusion of the less familiar elements in a small-scale non-H2S scheme of analysis

Abstract A recognised non-H 2 S bcheme for the separation and identification of the so-called “common” metallic elements has been extended so as to be applicable to materials containing the following elements : cerium, molybdenum, thorium, titanium, tungsten, uranium, vanadium, and zirconium.

Identification of polyatomic anions by infrared spectroscopy

Abstract Mixtures of ferrocyanide, ferricyanide and cobalticyanide, and of chromate, vanadate and sulphate, may be identified by the characteristic infrared spectra of the anions. The relation between the intensity of the band and the concentration of anion enables quantitative measurements to be made on microgram amounts.