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  • 1
    Electronic Resource
    Electronic Resource
    Method for the determination of thorium and uranium in urine by ICP-MS (1997)
    Springer
    Microchimica acta 126 (1997), S. 263-266 
    Details
    ISSN: 1436-5073
    Keywords: ICP-MS ; thorium ; uranium ; urine ; body-fluid ; trace elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract ICP-MS (inductively coupled plasma mass spectrometry) is shown as a very sensitive method for quantitative determination of Th and U concentration and excretion analysis in urine without any sample pretreatment. The current standard method for incorporation monitoring applies alpha-spectrometry, a very tedious and time consuming technique. ICP-MS offers an attractive alternative for monitoring of thorium and uranium body burdens in occupationally exposed subjects and also larger groups of the general population. A limit of determination of 0.5 ng/L in aqueous solutions and 1 ng/L in urine samples for both elements was achieved, with a precision of about ± 10% in the concentration range of appr. 10 ng/L. Due to the lack of a suitable reference material, the accuracy of the method was tested by comparing some of the results with those obtained by α-spectrometry, especially for U. There was a sufficient agreement on both results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242331
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of p, p′-azodibenzoate from p-aminobenzoic acid on silver island films during surface-enhanced Raman scattering (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 19 (1988), S. 281-287 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Surface-enhanced Raman scattering (SERS) from p-aminobenzoic acid (PABA) adsorbed on silver island films was investigated. PABA reacted very quickly to form p,p′-azodibenzoate when exposed to atmospheric moisture and laser light. This was evidenced by the appearance of a strong band near 1460 cm-1 and a strong doublet near 1150 cm-1 that were characteristic of the azodibenzoate. Exposure to a drier environment such as in a desiccator or a vacuum inhibited the reaction. It was concluded that the reaction of PABA to form the azodibenzoate involved two steps, the first being the hydrolysis of the amine and the second dimerization during exposure to laser light.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250190412
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