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  • Analytical Chemistry and Spectroscopy  (1)
  • Grundwasser, Leitungswasser, Vergleich mit AAS  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 474-478 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Solid-phase extraction, on-line derivatization, and measurement by ion trap mass spectrometry (ITD-MS) were used to investigate the biological degradation of pharmaceutical residues (clofibric acid, ibuprofen, diclofenac). The results of the single steps of sample pretreatment and analytical determination are reported. MS/MS measurements were performed on an ITD-MS by selecting collision induced dissociation of the molecular ions (M+) as parent ions to defined daughter ions. A pilot sewage plant and biofilm reactors operating under oxic and anoxic conditions were run as model systems with synthetic sewage water containing 10 to 50 mg/L dissolved organic carbon (DOC) and pharmaceuticals in concentrations of 10 μg/L. Clofibric acid displayed its persistent character in all cases. The pilot sewage plant and the oxic biofilm reactor showed comparable results for diclofenac and ibuprofen, which both were partly degraded. These results can explain the occurrence of these substances in sewage effluents and in the aquatic environment. A high degree of degradation was found especially for ibuprofen in the oxic biofilm reactor, which was attributed to adaptation of the biofilm to the residue. Two metabolites of ibuprofen could be identified on the basis of their mass spectra and comparison with literature data, viz. hydroxyibuprofen and carboxyibuprofen.
    Additional Material: 8 Ill.
    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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