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  • Best. von Blei, Cadmium, Kupfer, Zink in Wasser  (1)
  • Organic Chemistry  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 77 (1994), S. 859-868 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactivity of singlet oxygen (O2(1Δg)) with edta and its metal complexes with Al3+, Cu2+, Fe3+, and Mn2+ was investigated. The emission of singlet oxygen at 1270 nm in D2O was measured in order to determine the quenching efficiency of edta and edta-metal complexes for different metal/edta ratios. The sum of the rate constant (kr + kq) of the chemical reaction between singlet oxygen and the acceptor (kr) and of the physical quenching of singlet oxygen by the acceptor (kq) was obtained by a Stern-Volmer analysis. Measurements of the oxygen consumption in H2O were used to determine quantum yields of the sensitized photooxidation, and the combined results of these experiments allowed the determination of kr and kq separately. A strong isotope effect was observed between the deuterated and the hydrogenated solvents. This effect was shown to be independent of the analytical procedure used. The isotope effect, as well as the reactivity of edta and its metal complexes, depend markedly on the complexed metal ion.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 302 (1980), S. 364-369 
    ISSN: 1618-2650
    Keywords: Best. von Blei, Cadmium, Kupfer, Zink in Wasser ; Voltammetrie, inverse ; Grundwasser, Leitungswasser, Vergleich mit AAS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die inverse Voltammetrie ist für Schwermetallbestimmungen in Grund- und Leitungswasser geeignet. Das wird durch die Qualitätskriterien der Werte und den Vergleich mit atomabsorptionsspektrometrischen Messungen gezeigt. Beim Grundwasser tritt die Art der Probenahme als wichtige Einflußgröße hervor. Stagniertes Wasser in Hausinstallationen zeigt bis zu 10fache Konzentrationen, verglichen mit den durch kräftiges Abfließen erreichbaren Minimalwerten. Die Wassertemperatur ist hierfür eine gute Beurteilungshilfe.
    Notes: Summary Heavy metals in ground water and tap water can be determined by differential pulse anodic stripping voltammetry (DPASV). This is shown by the quality criteria of the results and by comparison with AAS values. Concentrations down to 0.1 μg/l are detectable. The way of sampling turns out to be quite important for ground water results. Heavy metal content in tap water is influenced by the retention time in the domestic pipes. Stagnation values are up to ten times the minimum concentration measured after heavy discharge. Water temperature is shown to be a good criterion for heavy metal concentration in that case.
    Type of Medium: Electronic Resource
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