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  • 1
    Electronic Resource
    Electronic Resource
    Trace level vanadium determination using thermal lens spectrophotometry (1998)
    Springer
    Microchimica acta 128 (1998), S. 169-175 
    Details
    ISSN: 1436-5073
    Keywords: thermal lens ; vanadium analysis ; trace analysis ; spectrophotometry ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Trace level vanadium determination is reported using a dual beam thermal lens spectrometer. The thermal lens was generated using an argon ion beam laser (pump beam) which was focused into a sample cuvette. The thermal lens signal (TLs) was monitored with a He-Ne laser beam and a photodiode detector. Multichannel averager software was developed for processing the transient TLs. The optimal set up, ensuring maximum sensitivity and linear calibration graphs was obtained using experimental design techniques. Under optimized conditions, the detection limits for aqueous and ethanol-water (2+3 v/v) and (4+1 v/v) vanadium complex solutions were, respectively, 0.0071 mg/l, 0.0065 and 0.0039 mg/l.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243045
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of surfactant/water systems near the critical micellar concentration using thermal lens spectroscopy (1998)
    Springer
    Microchimica acta 130 (1998), S. 105-110 
    Details
    ISSN: 1436-5073
    Keywords: thermal lens spectroscopy ; micellar solutions ; surfactant CMC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel application of photothermal spectroscopy to the study of surfactant-water systems near the critical micellar concentration is reported. The thermal lens signal was induced by a slightly soluble dye and was measured with a dual-beam thermal lens spectrometer. For the two surfactants considered: nonyl phenol and Triton X-100, sharp variations of the thermal lens signal were observed at the critical micellar concentration (CMC), namely an increase for nonyl phenol and a decrease for triton X-100. These effects are arguably related to micelle formation. Our work serves as an initial assessment of the potential of the technique for the study of disperse systems of a higher complexity or dark systems where conventional techniques are impossible to apply.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01254598
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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