Browsing by Author "Piper, NR"

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    The determination of strontium 90 in environmental materials.
    (Australian Atomic Energy Commission, 1967-02) Davis, PS; Piper, NR
    A method for determining strontium 90 in environmental materials is described. It consists of the ion-exchange separation of strontium from calcium at an elevated temperature by careful control of pH and the molar ratio of Ca:EDTA, followed by scavenging, Activity of the Sr-90 is determined by counting the yttrium 90 daughter. Recovery of strontium is determined with Sr-85 tracer. Typical recovery of strontium is 70-90 per cent. Procedures are given for analysis of milk, vegetation, meat and fish, rainwater, and oyster shell and reference is made to analysis of oyster flesh, soil and effluent.
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    Improved method for the determination of strontium-90 in oyster flesh.
    (Australian Atomic Energy Commission, 1967-07) Lahoud, A; Piper, NR
    The method for the determination of strontium-90 in environmental materials used in this laboratory has been found to be subject to interference from the large concentration of zinc in oyster flesh. This report deals with the development of a suitable solvent extraction procedure that will remove zinc without itself interfering in the determination. The method selected was the extraction of the thiocyanate complex of zinc from a hydrochloric acid solution into diethyl ether. This procedure removed greater than 95 per cent of zinc and produced no undesirable complications. Normal recovery of strontium was raised to better than 90 per cent.
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    Improved method for the determination of strontium-90 in soils and sands.
    (Australian Atomic Energy Commission., 1967-07) Lahoud, A; Piper, NR
    The method for the determination of strontium-90 in environmental materials used in this laboratory has been found to be subject to interference from large concentrations of iron and aluminium in soil extracts. This report deals with the development of a suitable solvent extraction procedure that will remove iron and aluminium without itself interfering in the determination. The method selected was the extraction of iron and aluminium acetylacetonates into chloroform at controlled values of pH. This procedure removed better than 95 per cent of both iron and aluminium and produced no undesirable complications. Normal recovery of strontium was better than 80 per cent.