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  • 1
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Seven synthetic graphite powders of different grade of purity were analyzed by means of INAA, WDXRF, EDXRF, DC-OES directly and using ICP-MS, ICP-OES, ETAAS and FAAS in combination with various sample preparation techniques. On the basis of a statistical evaluation of the results obtained, for the trace elements Al, Ca, Cr, Cu, Fe, Mn and Ni, reference values were established and, for the elements As, Co, Mg, Mo, Pb, Sb, Si, Sr, Ti, V, Zn and Zr, informative values are given. The analyzed reference materials are commercially available.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 60 (1972), S. 591-595 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The apparatus for rapid nitrogen determination according toMerz has been modified. Between each two combustions, oxygen is flushed through the combustion tube and is vented before the reduction tube. Therefore, at the beginning of each analysis, the combustion chamber is filled with oxygen, providing a more favorable atmosphere for the rapid ignition. The alterations in the Hereaus apparatus and the preparation of an oxidation catalyst (cobalt oxide and tungsten oxide) are described.
    Notes: Zusammenfassung Einige Änderungen an der Apparatur zur Stickstoffschnellbestimmung nachMerz wurden vorgenommen. Dadurch wird erreicht, daß zwischen den einzelnen Verbrennungen Sauerstoff das Verbrennungsrohr durchspült und vor dem Reduktionsrohr nach außen tritt. Der Verbrennungsraum ist daher bereits zu Beginn jeder Analyse mit Sauerstoff gefüllt, wodurch günstigere Bedingungen für die schlagartige Verbrennung erzielt werden. Der Umbau der von der Firma Heraeus gelieferten Apparatur und die Herstellung eines Oxydationskatalysators (Kobaltoxid-Wolframoxid) werden beschrieben.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 32 (1982), S. 943-946 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1618-2650
    Keywords: Elementaranalyse, Datenverarbeitung ; Organisation eines Labors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird das Konzept eines Echtzeit-Datenverarbeitungssystems beschrieben, das in Kombination mit mechanisierten und automatisierten Analysenmethoden eine Verbesserung der analytischen Serviceleistung ermöglicht. Die Hardware setzt sich im wesentlichen aus einem 28 K-Worte Kleincomputer mit 2 Plattenspeichereinheiten, Bedienungskonsolen und Beleglesern zusammen. Die hauptsächlichen Funktionen dieses Teils der Anlage sind: Registrieren der Aufträge, Erstellen von Arbeitslisten für die Laboratorien, Überwachen der termingerechten Auftragserledigung, Sammeln, Speichern und Auswerten der anfallenden Resultate, Treffen einfacher Entscheidungen und schließlich Erstellen und Ausdrucken der Analysenbefunde. Darüber hinaus verfertigt der Computer täglich Berichte über den Stand der Auftragserledigung und speichert Daten für die Statistiken und Kostenabrechnungen. Zur Datenübertragung aus den Laboratorien stehen 36 Linien zur Verfügung. Dabei ist wesentlich, daß elektronisch vorverarbeitete Daten, also fertig berechnete Resultate übertragen werden. Dazu dienen on-line angeschlossene Tischrechner, Datenstationen und Belegleser sowie Datenverarbeitungseinheiten (Prozent-Box) eigener Konstruktion. Die Arbeitsplätze in den Laboratorien sind somit weitgehend autonom. Dieses hierarchische Datenverarbeitungssystem bringt arbeitstechnische Vorteile, gewährleistet aber vor allem die ständige Servicebereitschaft unserer Laboratorien, da auch bei Ausfall des Computers an den Analysengeräten unbeeinflußt weitergearbeitet werden kann.
    Notes: Abstract To increase the efficiency of the analytical services the analytical methods have been improved by mechanisation and automation, and combined with a real-time data processing system. The hardware consists essentially of a 28 K-words minicomputer with 2 disc storage units, teletypes and optical mark readers. The main functions of this part of the system are as follows: registering the incoming requests, supplying work schedules for the various laboratories, controlling the completion of the work within the required time, collecting, storing, and processing the results, making simple decisions, and finally, editing and printing the analysis reports. Moreover, the computer produces daily reports on the state of progress of requests, and stores the data for usage in statistics and cost accounting. There are 36 lines available for the transfer of data from the laboratories. An important feature of the system design is the transfer of electronically preprocessed data, i.e. already calculated final results. For this purpose, on-line desk-top calculators, alphanumeric display data terminals, and data preprocessing units (percentage-box) designed and developed in our own laboratories are being used. The individual places of work in the laboratories are thus to a great extent autonomous. This hierarchical data processing system yields technical advantages, and most of all, guarantees a permanent service ability of our laboratories since even in the case of a breakdown of the computer, the analytical work can be continued without any interference.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 583-587 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The direct instrumental methods X-ray fluorescence spectrometry (XRFS) and instrumental neutron activation analysis (INAA), and, after digestion of the sample, inductively coupled plasma mass spectrometry (ICP-MS) were applied in sequence to analyse small single aerosol filters. XRFS detected up to 19, INAA up to 22, and ICP-MS up to 33 elements. In total, up to 45 elements were determined, and, for a number of additional elements limits of detection could be given. For many elements, the data quality could be checked by cross-comparison of the results of two or all three methods. These methods very meaningfully complement each other and, in the manner used, allow the determination of all elements of interest in a small aerosol filter sample.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 331 (1988), S. 51-54 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new method for the determination of iodine in biological samples is described. If series of samples of uniform matrix are to be analyzed no mineralization is required: water soluble iodide coprecipitated on a carrier and tissue-bound iodine are both collected on a filter and simultaneously determined by X-ray fluorescence thin layer technique. In the particular case of the determination of iodine in rat thyroids this procedure allows a satisfactory screening of drugs influencing the iodine balance. In the general case of trace iodine determination in quite different matrices the organic material is ashed prior to the precipitation and measuring step. The trace iodine content of several reference materials from NBS, BCR and IAEA obtained by this method is given.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 321 (1985), S. 587-591 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The lifetime of Cr(VI) as a function of pH, container material, initial concentration and temperature has been investigated in pure water solutions. The observated behaviour of the chromium species has been further checked on several waste water samples. Based on these results a recommendation for the preservation of samples for the determination of Cr(VI) in water and waste water is made: By means of a preservation solution containing carbonate buffer (pH 9) and EDTA [for masking Cr(III)] losses of Cr(VI) over 7 days could be reduced from 60–80% to less than 20%.
    Notes: Zusammenfassung Die Lebensdauer von Cr(VI) in Abhängigkeit von pH, Behältermaterial, Ausgangskonzentration und Temperatur wurde in reinen wäßrigen Lösungen untersucht. Das beobachtete Verhalten der Chrom-Species wurde weiterhin anhand einiger Abwasserproben überprüft. Aufgrund dieser Resultate wird eine Empfehlung für die Konservierung von Proben für die Cr(VI)-Bestimmung in Wasser und Abwasser angegeben: Mit Hilfe einer Konservierungslösung aus Carbonatpuffer (pH 9) und EDTA [zur Maskierung von Cr(III)] konnten Cr(VI)-Verluste über 7 Tage von 60–80% auf weniger als 20% vermindert werden.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 334 (1965), S. 312-320 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The thermal decomposition of H6TeO6 has been investigated using thermogravimetric analysis (reaction scheme see “Inhaltsübersicht”).At 406°C the compound Te2O5 (stable at room temperature; d = 4.14 g/cm3) has been found. Its existence is demonstrated by gravimetric analysis, Debye-Scherrer method and tensimetry.
    Notes: Die thermische Zersetzung der H6TeO6 wurde thermogravimetrisch verfolgt und die einzelnen Zersetzungsprodukte wurden untersucht. Das Schema der thermischen Zersetzung ist: .Durch die Zersetzung von H6TeO6 oder TeO3 bei 406°C wurde eine neue Verbindung Te2O5 gewonnen. Te2O5 (d = 4,14 g/cm3) ist bei normaler Temperatur an der Luft stabil. Die Existenz wurde durch die gravimetrische Analyse, Debye-Scherrer-Diagramm und tensimetrisch nachgewiesen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 1998-03-03
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
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