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  • 1
    Electronic Resource
    Electronic Resource
    Separation and determination of gold from iron rich matrices by an off/on-line preconcentration system coupled to ICP-AES (1995)
    Springer
    Microchimica acta 119 (1995), S. 265-276 
    Details
    ISSN: 1436-5073
    Keywords: separation of gold ; iron rich matrices ; off/on-line preconcentration ; coupling to ICP-spectrometer ; standard reference materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A preconcentration/separation method has been developed for the off/on-line determination by ICP-AES of gold in complex matrices, containing iron and manganese which cause severe spectral interferences on the two most sensitive Au-lines. The available automated preconcentration apparatus was modified using as absorbent the highly selective, for precious metals, chelating anion exchanger SRAFION NMRR. From the elution of this resin with 5% thiourea a nearly quantitative recovery of gold and its separation from iron, existing in percent range in the matrix, and from manganese was obtained. The validity of the developed method was tested by the determination of gold in standard reference materials from BCR, such as sewage sludge of domestic and mainly industrial origin and in a calcareous loam soil. The preconcentration procedure was synchronized with the ICP operating parameters in order to get an optimised on-line coupling of these two systems. The described process has been successfully applied to the determination of low gold contents in dissolved iron rich sediments using for the gold prospection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244006
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  • 2
    Electronic Resource
    Electronic Resource
    Application of an on-line preconcentration system in simultaneous ICP-AES (1992)
    Springer
    Microchimica acta 106 (1992), S. 191-201 
    Details
    ISSN: 1436-5073
    Keywords: ICP-AES ; preconcentration ; standard reference materials ; trace element analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A PC-controlled on-line preconcentration system (TRACECON) developed by Knapp et al. [11], was connected to a JY-70 Plus simultaneous ICP spectrometer to preconcentrate on-line seven trace elements (Cu, Fe, Zn, Cr, Ni, Mn, V) in biological and environmental samples. EDTrA-cellulose was used as column material. The elemental concentrations were determined by simultaneous ICP-AES. The effect of pH of the sample solution on the enrichment was studied. It was found that the recoveries of chromium and iron depend strongly on the pH of the sample solution. All the elements mentioned were recovered quantitatively at pH 4.0±0.1. The flow rates of sample solution and element solution were optimized. The enrichment factors for seven elements at 5 ml loading volume range from 3.9 for Cu to 7.9 for Zn. The detection limits of all seven elements were improved. The accuracy of the method was tested by the analysis of a number of CRMs of NIST, BCR and NIES. Most results are in good agreement with the certified values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242090
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