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  • Electronic Resource  (6)
  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 223 (1966), S. 321-335 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei Verwendung von Isotopenverdünnungstechnik und massenspektrometrischer Isotopenanalyse läßt sich die quantitative Bestimmung von 0,1 μg Sr oder Ba bzw. 1 μg Ca in Natriumsalzen durchführen. Für den untersuchten Konzentrationsbereich von 1–1000 ppm betragen die relativen Verfahrensstandardabweichungen 1,2% bei Ca, 0,6% bei Sr und 0,7% bei Ba. Eine Untersuchung der Fehlerfortpflanzung ermöglicht die Einstellung der günstigsten Bedingungen für die Isotopenverdünnungstechnik. Die Bestimmung der Nachweisgrenzen wird angegeben.
    Notes: Summary Isotope dilution technique combined with isotope analysis by mass spectrometry is a preferable method for the determination of 0.1 μg of Sr and Ba, and 1 μg of Ca, resp., in sodium salts. For the concentration range of 1–1000 ppm the relative standard deviations are for Ca 1.2%, Sr 0.6% and Ba 0.7%. A discussion of the propagation of errors allows the selection of optimum conditions for this analytical procedure of isotope dilution. Limits of detection are calculated.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 216 (1966), S. 80-94 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die allgemeinen Begriffe, die zur statistischen Definition der Nachweisgrenze führen, werden erklÄrt und für verschiedene Arten analytischer Verfahren diskutiert. Nachweisgrenzen dürfen nicht für Analysenverfahren angegeben werden, die nicht genügend in allen Einzelheiten definiert sind. Der Begriff der Garantiegrenze für Reinheit wird auf inhomogene Proben ausgedehnt.
    Notes: Summary The general concepts, leading to the statistical definition of the “limit of detection” are explained and interpreted for different types of analytical procedures. Limits of detection must not be given for analytical methods which are not sufficiently defined in all details. The concept of the “limit of guarantee for purity” is expanded to inhomogeneous samples.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 209 (1965), S. 1-18 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The statistical definition of a “limit of detection” (by: “analytical signal” = 3 × “analytical noise”) requires many foregoing considerations which are explained. It is necessary to distinguish sharply between “reading”, “measured value” and “result of analysis”. The criterion for detection is discussed for different conditions, its character as a convention is pointed out. To describe adequately the negative outcome of a trace-analysis the new concept of “limit of guarantee for purity” is introduced. This limit is always higher than the limit of detection. The (conventional) choice of the number 3 as factor for the level of confidence is shown to be justified by practical reasons.
    Notes: Zusammenfassung Die in der statistischen Definition der Nachweisgrenze („analytisches Signal“ = 3 · „analytischer Störpegel“) liegenden Voraussetzungen werden eingehend untersucht. Es ist notwendig, zwischen „Anzeige“, „Meßwert“ und „Analysenwert“ scharf zu unterscheiden. Das Nachweiskriterium wird für verschiedene Fälle diskutiert, sein Charakter als Konvention wird hervorgehoben. Um den negativen Ausfall einer Nachweisanalyse angemessen zu beschreiben, braucht man den neuen Begriff einer „Garantiegrenze für Reinheit“; diese liegt höher als die Nachweisgrenze. Die Wahl des Sicherheitsfaktors 3 in den Definitionen der Grenzen wird begründet.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 160 (1968), S. 807-807 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 4 (1965), S. 900-900 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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