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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 86 (1981), S. 221-225 
    ISSN: 1437-1596
    Keywords: 4-Hydroxycoumarin, identification ; Derivative spectroscopy, coumarin ; Cumarinderivate, Nachweis ; Derivativspektroskopie, Cumarin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Vorgestellt wird eine schnelle Nachweismethode für 4-Hydroxicumarine aus Organen oder Blutproben. Bei Verwendung eines Ultraschallhomogenisators ist die Analyse nach spätestens 30 min abgeschlossen. Die Identifizierung der Cumarinderivate erfolgt durch Derivativ-UV-Spektroskopie im Normalspektrum und dessen 1. Ableitung bei 340–240 nm. Als weiteres Nachweisverfahren kann zusätzlich die HPTLC angewendet werden.
    Notes: Summary Presented here is a rapid method of identifying 4-hydroxycoumarins in organs or blood samples. Using an ultrasonic homogenizer, a complete analysis is obtained in less than 30 min. Coumarin derivatives are identified by means of derivative UV spectroscopy in the normal spectrum and its first derivation at 340 to 240 nm. HPTLC can be employed as supplementary identification method.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 342 (1992), S. 950-956 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Using solid sampling with graphite furnace atomic absorption spectrometry (GFAAS), values for cadmium, copper, lead and zinc in six biological reference materials were obtained from up to four laboratories participating in three collaborative studies. These results are compared with those obtained with other methods used in routine analysis from laboratories of official food control. Under certain conditions solid sampling with GFAAS seems to be suitable for routine analysis as well as conventional methods.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 316 (1983), S. 306-308 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A determination of the valency of inorganic arsenic by the AAS method described will not meet with problems in cases where trivalent and/or pentavalent arsenic is present in a solution that is suitable for measurement by means of AAS. Since reference materials with a certified As(III) content are not available, organic material with admixtures of As(III) and As(V), respectively, was used in studies of the influence of methods of digestion upon the valency of arsenic. In the studies described, all methods of mineralization used were found to change the original valency of arsenic to a degree that was not reproducible. Mainly, processes of oxidation were observed.
    Notes: Zusammenfassung Die Feststellung der Wertigkeit anorganischen Arsens stellt mit der vorgestellten AAS-Methodik dann kein Problem dar, wenn dreiwertiges bzw. fünfwertiges Arsen in einer zur Messung mittels AAS geeigneten Lösung vorliegt. Da keine Referenzmaterialien mit zertifiziertem As(III)-Gehalt erhältlich sind, wurden Untersuchungen zur Beeinflussung der Wertigkeit des Arsens durch Aufschlußmethoden mit organischen Modellmaterialien, in die As(III) bzw. As(V) eingemischt wurden, durchgeführt. Alle angewandten Mineralisierungsverfahren veränderten in einem nicht reproduzierbaren Maß die ursprüngliche Wertigkeit des Arsens. Es wurden hauptsächlich Oxidationsprozesse beobachtet.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 449-452 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Within the research project “German Food Contamination Monitoring Programme”, selected foodstuffs have to be examined by the official food control laboratories. Contents of pesticides and heavy metals have to be determined by means of routine analysis. Biological reference materials are used in collaborative studies and in parallel investigations for analytical quality assurance. Using lead as an example, results obtained for three reference materials are discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 736-737 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The general and analytical strategy for a monitoring project for various chemical elements, nitrate and some halogenated organic compounds in milk, beef, pork, potatoes, lettuce, cabbage, apples and strawberries within the activities of official food control in the Federal Republic of Germany is outlined.
    Type of Medium: Electronic Resource
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