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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 548-552 
    ISSN: 0935-6304
    Keywords: Glass capillary gas chromatography ; Immobilization ; OV-240-OH cyanopropylpolysiloxane ; Isomer specificity ; Polychlorinated dibenzo-p-dioxins ; Polychlorinated dibenzofurans ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glass capillaries were leached, dehydrated, persilylated with 1, 3-bis (3-cyanopropyl) tetramethyldisiloxane, and coated with OV-240-OH. After crosslinking and binding the phase to the glass surface the columns showed high separation efficiency, high temperature stability, and inertness comparable to persilylated apolar columns. Column performance is shown to be superior to liquid phase cyanopropyl columns such as SP 2330. The excellent separation capabilities together with the selectivity of the phase makes OV-240-OH coated columns a valuable tool for the determination of toxic isomers in complex mixtures of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). The order of elution of individual TCDD isomers was found to be similar to that described for SP 2330 or Silar 10c. The detection of PCDDs and PCDFs in a fly ash extract further illustrates the utility of OV-240-OH coated columns. The high temperature limit of these columns opens the way for the analysis of high boiling compounds such as mixed brominated/chlorinated dibenzo-p-dioxins and dibenzofurans.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 265-272 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Embrittlement conditions of ferritic chromium steels and influence on the corrosion fatigue behaviourThe corrosion fatigue behavior of two ferritic stainless steels, with 18% and 28% chromium respectively, embrittled by α'- or sigma-phase has been studied in this investigation. No effect of the α'-phase on the corrosion fatigue behaviour in a 0.5 N or 4 N air saturated soldium chloride solution at 80 °C has been found. In the 4 N solution corrosion fatigue cracking of the 18% chromium steel in the solutionized as well as in the α'-embrittled condition is initiated by pitting at nonmetallic inclusions. Sigma-phase not only decreases the mechanical properties of the 28% chromium steel by heavy embrittlement but also leads to crack initiation by pitting in the 4 N solution at the interface sigma/ferrite. The pronounced decrease of the corrosion fatigue properties of the 28% chromium steel could well be correlated with chromium depletion of the ferrite matrix by precipitation of sigma phase.
    Notes: Der Einfluß der versprödenden Phasen α' und σ auf das Schwingungsrißkorrosionsverhalten der beiden rein ferritischen Chromstähle 1.4522 und 1.4575 (18% bzw. 28% Chrom) wurde untersucht. Sowohl in der 0,5 N als auch in der 4 N Natriumchloridlösung konnte keine Beeinflußung der Korrosionseigenschaften durch α'-Ausscheidung festgestellt werden. In Luft und der 0,5 N Lösung bewirkt die Ausscheidung von α'-Phase bei beiden Stählen eine Erhöhung der Schwingfestigkeit. Der Abfall der Korrosionsschwingfestigkeit in der 4 N Natriumchloridlösung wird beim 18%-Chromstahl, im lösungsgeglühten und α'-versprödeten Zustand, durch Lochfraß an nichtmetallischen Einschlüssen herbeigeführt. Die durch die α'-Ausscheidung hervorgerufene, stärker lokalisierte Oberflächenverformung führt beim 28%-Chromstahl in der 4 N Lösung ebenfalls zur Erniedrigung der Korrosionsschwingfestigkeit. Die sigma-Phase verschlechtert einerseits die mechanischen Eigenschaften des 28%-Chromstahles und bewirkt in der 4 N Lösung Bildung von Lochfraß an der Grenzfläche sigma-Phase/Ferrit. Die Bildung von Lochfraß konnte eindeutig auf Chrom- und Molybdänverarmung in der'Ferritmatrix zurückgeführt werden.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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