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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Spectrochimica Acta Part B: Atomic Spectroscopy 35 (1980), S. 177-192 
    ISSN: 0584-8547
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Spectrochimica Acta Part B: Atomic Spectroscopy 41 (1986), S. 27-38 
    ISSN: 0584-8547
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Carbon fibre-reinforced polyetheretherketone (CF-PEEK) substrates were coated with titanium by vacuum-plasma-spraying and chemically treated in 10 M sodium hydroxide (NaOH) solution. After NaOH treatment, the specimens were immersed in simulated body fluid (SBF) containing ions in concentrations similar to those of human blood plasma. Scanning electron microscopy, energy-dispersive X-ray analysis and diffuse reflectance Fourier transformed–infrared spectroscopy were used to analyse the NaOH-treated VPS-Ti surface and the calcium phosphate layer formed during immersion in SBF. It was observed that a carbonate-containing calcium phosphate layer was formed on the NaOH-treated VPS-Ti surface during immersion in SBF, whereas no calcium phosphate precipitation occurred on the untreated surfaces. It is therefore concluded that vacuum-plasma-spraying with titanium and subsequent chemical modification in 10 M NaOH solution at 60°C for 2 h is a suitable method for the preparation of bioactive coatings for bone ongrowth on CF-PEEK.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Plasma activation of polyetheretherketone (PEEK) surfaces and the influence on coating formation in a supersaturated calcium phosphate solution was investigated in this study. It was observed that plasma treatment in a N2/O2 plasma had a significant effect on the wettability of the PEEK surface. The contact angle decreased from 85° to 25° after plasma treatment. Cell culture testing with osteoblastic cell lines showed plasma activation not to be disadvantageous to cell viability. X-ray photoelectron spectroscopy (XPS) analysis was performed to characterize the chemical composition of the PEEK surfaces. It was observed that the O1s intensity increased with plasma activation time. At the C1s peak the appearance of a shoulder at higher binding energies was observed. Coating of PEEK was performed in a supersaturated calcium phosphate solution. Coating thicknesses of up to 50 μm were achieved after 24 days of immersion. Plasma activation followed by nucleation in a highly saturated hydroxyapatite solution had a positive effect on the growth rate of the layer on PEEK. Chemical analysis revealed that the coating consists of a carbonate-containing calcium phosphate.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 280 (1969), S. 115-120 
    ISSN: 1618-2650
    Keywords: Best. von Blei in Luftstaub ; Röntgenfluorescenz-Spektrometrie/Spektralphotometrie, Atomabsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die wellenlängendispersive Röntgenfluorescenz-Spektrometrie wurde angewandt zur Bestimmung von Blei in Zürcher Schwebestaub, welcher an Glasfaserfilter nach dem LIB-Verfahren gesammelt wurde. Zur Eichung des Spektrometers wurden jeweils 5 mit Schwebestaub beladene Filter verwendet. Die Flächenbelegung dieser Eichfilter an Blei wurde mittels Atomabsorption in einer Graphitrohrküvette bestimmt. Die Präzision der Bleibestimmung nach dem Luftfiltration/Röntgenfluorescenz-Verfahren wird durch die inhomogene Pb-Verteilung auf ca. 6% einfache relative Standardabweichung beschränkt.
    Notes: Abstract Wavelength dispersive X-ray fluorescence has been used for the determination of lead in atmospheric dust collected on glass fiber filters by the LIB filtration method. 5 filters loaded with atmospheric dust served as standards. The area concentration of lead on the standard filters was determined by atomic absorption using a graphite furnace atomizer. The precision of the determination of lead by the air filtration/X-ray procedure is limited by inhomogeneity of the distribution of lead to about 6% relative standard deviation.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 291 (1978), S. 193-199 
    ISSN: 1618-2650
    Keywords: Atomabsorption ; Empfindlichkeit, instrumenteile Linienverbreiterung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei der atomabsorptiometrischen Bestimmung vieler Elemente, wie z.B. Ni, Fe und Pd, werden die anfÄngliche Neigung und die Krümmung der Eichkurven durch die spektrale Bandbreite des Monochromators stark beeinflu\t, wenn dieser nicht oder schwach absorbierte Linien von der Resonanzlinie nicht zu trennen vermag. Die AbhÄngigkeit der optischen Dichte von der Konzentration und der spektralen Bandbreite wird mit Hilfe einer Funktion beschrieben, welche die Konzentration, die spektrale Bandbreite, die relative IntensitÄt der von der spektralen Strahlungsquelle emittierten Linien, die Absorptionskoeffizienten, sowie die AbstÄnde der Störlinien von der Resonanzlinie als Variablen enthÄlt. Ein Verfahren wird diskutiert, welches auf der Registrierung von Emissionsspektren in engen Bereichen an beiden Seiten der betreffenden Resonanzlinie beruht und alle Daten für die letztgenannten drei Grö\en liefert. Das Verfahren gibt zudem nützliche Informationen über den Zustand der Energiequelle.
    Notes: Summary In determinations of many elements, like Ni, Fe and Pd, by AAS the initial slope and the bending of the calibration curves are strongly affected by the spectral band width of the monochromator, if that cannot separate the resonance line from other not or weakly absorbed lines. The dependence of the optical density on the concentration and spectral band width is described by a function with the variables: concentration, spectral band width, relative intensities of lines emitted by the spectral source, absorption coefficients and the distances of disturbing lines from the resonance line. A procedure is discussed, which is based on the registration of emission spectra in a small spectral range on both sides of the resonance line in question and provides the data for the three quantities mentioned last. The procedure provides also useful information about the condition of the spectral source.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Quecksilber wurde mit der Zeeman-Atomabsorptions-Spektroskopie in Urin und Abwässern nach einer Matrixmodifizierung durch Zugabe von 0,1M HNO3, 0,05M KBr und 5 μl Br2/ml sowie nach seiner Extraktion aus Schlamm, Eisenschlamm und Ionenaustauschern mit einer Mischung der gleichen Zusatzstoffe bestimmt. Die gleichen Proben wurden auch nach der Kalt-Dampf-Methode nach dem Naßaufschluß in geschlossenen Teflonbomben analysiert. Das Verhältnis der betreffenden Konzentrationen betrug 1,21±0,39 (Standardabweichung), wobei der Konzentrationsbereich 0,1–50000 mg Hg/kg umfaßte. Die analytischen Leistungsfähigkeiten der beiden Verfahren wurden verglichen.
    Notes: Summary Mercury was determined by Zeeman Atomic Absorption Spectrometry after matrix modification of urine and waste water by addition of 0.1M HNO3, 0.05M KBr, and 5νl Br2/ml, and after its extraction from sludge, iron sludge and ion exchanger by a mixture containing the same additives. The same samples were also analysed by the cold vapour method after wet oxidation of the samples in closed teflon bombs. The ratio of the corresponding concentrations was 1.21±0.39 (SD) and the concentration range covered 0.1–50000 mg Hg/kg. The analytical powers of both procedures are compared.
    Type of Medium: Electronic Resource
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