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  • Articles  (862)
  • Analytical Chemistry and Spectroscopy  (862)
  • 1980-1984  (862)
  • Physics  (862)
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  • Articles  (862)
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  • 1
    Electronic Resource
    Electronic Resource
    An electronic modification of an automatic x-ray fluorescence spectrometer with sample loader to increase the flexibility of the measurement sequencePaper presented at the 10th conference on x-ray analytical methods, edinburgh, UK. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 2-4 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Philips PW 1450/00 or /10 automatic hardware-programmed X-ray spectrometer, when used in conjunction with the PW 1466 60 position sample loader, permits measurement of both standard and unknown using the same channel only when the ratio mode is selected. Further, a standard must be measured for every unknown. An electronic modification is described which overcomes both of these restrictions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090103
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  • 2
    Electronic Resource
    Electronic Resource
    Multielement x-ray fluorescence spectrometry of solutions (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 13-18 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The theoretical relationships between fluorescence intensity and concentration have been used for the calculation of correction constants of the Lachance--Traill and Rasberry--Heinrich equation for systems of solutions. The constants have also been calculated by means of the multivariate least--squares method. Those two alternatives have been tested on systems of Cu--Fe--Zn and Cu--Fe--Zn--Pb in 3.5% aqueous nitric acid and compared with the simple two-variable linear relationship between fluorescence intensity and concentration. The multivariate least--squares alternative gives for the Lachance--Traill method very accurate results (average relative deviation does not exceed 0.18%). In a theoretical discussion, the relationship between optimum sample concentration and solvent correction (enhancement) constant is shown. The optimum conditions for a background reading are also calculated.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090106
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray K absorption studies on some 1,10 phenanthroline-based cobalt complexes (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 77-80 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The X-ray K absorption edges of Co in some 1,10 phenanthroline-based complexes of cobalt have been recorded. The results have been discussed qualitatively in terms of the effective nuclear charge on the central metal atom and the nature of the ligand.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090210
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  • 4
    Electronic Resource
    Electronic Resource
    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 95-95 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090302
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  • 5
    Electronic Resource
    Electronic Resource
    The derivation of influence coefficients from experimental and calculated XRF dataPresented at the 11th conference on x-ray analvtical methods, durham, uk, 1978. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 96-100 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The use of the multiple linear regression program for the derivation of influence coefficients destroys the data bank in the Philips PW 1450/10 spectrometer computer and interrupts analysis. Consideration of the basis of α-coefficients as applied to relatively dilute solutions leads to methods of avoiding the use of this program. Linear regression involving a single independent variable and simple algebraic expressions can be used to derive the coefficients. The requirements for converting α-coefficients applicable to one solvent for use in a different solvent are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090303
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  • 6
    Electronic Resource
    Electronic Resource
    The discrimination and classification of small fragments of window and non-window glasses using energy-dispersive x-ray fluorescence spectrometryBased on a paper presented at the 8th international conference on atomic spectroscopy/xxi colloquium spectroscopicum internationale, cambridge, england, 1-6 july 1979. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 119-122 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Fifty pairs of window/non-window glasses, the samples in each pair being matched in refractive index to the fourth decimal place, have been analysed using energy-dispersive X-ray fluorescence spectrometry. The spectra, from 200μg fragments, were compared using a computer based multi-dimensional data processing system. Forty-three pairs of glasses were readily discriminated and forty-nine pairs showed significant differences at about the 5% level. The spectral data for the 100 glass samples were then examined graphically for trends in the elemental levels between the window and non-window glasses. This led to the construction of two linear combinations, namely the peak area ratio (to calcium) of iron with that of magnesium and the peak area of arsenic with refractive index. When plotted against each other these linear combinations and a selection rule allowed 95% of the glasses to be correctly classified.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090306
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  • 7
    Electronic Resource
    Electronic Resource
    Zur quantitativen mikrosondenanalyse von geologischen proben mittels kombiniertem EDS/WDS (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 134-137 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Description / Table of Contents: A method for quantitative microprobe analyses of geological samples (silicates and carbonates) is described. In the case of silicates for total analysis the need is to detect simultaneously more than 10 chemical main- and minor-constituents. For this purpose two experimental possibilities are available: (a) automatic control of the crystal scanners (sequence control); (b) combination WDS/EDS (wavelength-dispersive and energy-dispersive system). These two possibilities are discussed. Technical notes of the equipment and the analytical method are described in detail. High analytical precision can be obtained.
    Notes: Es wird eine quantitative Analysenmethode für geologische Proben (Silikate and Karbonate) mittels Röntgenmikrosonde beschrieben. Im Falle von Silikaten sind fur eine Totalanalyse mehr als 10 chemische Elemente simultan zu erfassen (Haupt-und Nebenelemente). Zwei experimentelle Moglichkeiten sind realisierbar: (a) Automatischer Sequenzbetrieb mittels Kristallspekrometern; (b) Kombination WDS/EDS (wellenlangendispersives und energiedispersives System). Diese beiden Möglichkeiten werden diskutiert. Technische Angaben und apparativer Aufwand werden beschrieben. Es wird dargelegt, auf welche Weise eine hohe analytische Genauigkeit erreicht werden kann.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090309
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of tube voltage rectification in X-ray fluorescence analysis without standards (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 143-145 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The spectral photon distribution from X-ray tubes operated at constant potential is compared to the distribution resulting from self rectification circuits. Kramers' equation is modified by calculating the average values of the photon flux during one period of voltage fluctuation and the results are used to transform Gilfrich and Birks' experimental tube spectra to those expected from a half-wave rectification circuit. The effect of using both constant potential and sine wave potential, as well as constant potential with overlaid sine wave ripple, is discussed. Results are shown by using experimental data from Ag-Au-Cu alloys and ‘no standard’ methods (data evaluation without reference specimens).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090311
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  • 9
    Electronic Resource
    Electronic Resource
    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 153-153 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090402
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  • 10
    Electronic Resource
    Electronic Resource
    Qualitative and quantitative analysis of technical aluminium phosphide (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 163-169 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The qualitative and quantitative composition of technical aluminium phosphide was studied employing X-ray electron spectrometry, X-ray fluorescence analysis and X-ray diffractometry as well as gravimetric and gas volumetric methods. In addition to aluminium phosphide, AIN (8%), Al(1%) and Al(OH)3 (10%) were found. Al(OH)3 is produced by the reaction of AlP with H2O. Models describing this reaction in humid air and allowing for quantitative analysis are presented.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090405
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