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  • 1
    Electronic Resource
    Electronic Resource
    In- and off-laboratory sources of uncertainty in the use of a serum standard reference material as a means of accuracy control in cholesterol determination (1998)
    Springer
    Accreditation and quality assurance 3 (1998), S. 127-130 
    Details
    ISSN: 1432-0517
    Keywords: Key words Experimental design ; Analysis of variance (ANOVA) ; Determination of uncertainties ; Human serum ; Cholesterol ; Standard reference material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Repeated subsampling or a hierarchical design of experiments combined with an analysis of variance (ANOVA) is demonstrated to be a useful tool in the determination of uncertainty components in amount-of-substance measurements. With the reference material of human serum as investigated here for total cholesterol, besides several in-laboratory sources of uncertainty, a vial-to-vial effect which can be regarded as an off-laboratory source was found to be significant. This knowledge might be essential when the material is used for calibration and for the self-assessment of a laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690050204
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Display aspects in hierarchical clustering (1989)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 3 (1989), S. 537-540 
    Details
    ISSN: 0886-9383
    Keywords: Cluster analysis ; Display ; Interlaboratory test ; Ultrametrics ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultrametric inter-object distances found by hierarchical clustering may be used to generate and appropriate constellation of points in a plane. A configuration of points which reproduce the ultrametric distances in a low-dimensional space as closely as possible can be found by Torgerson's method of multidimensional scaling. The resulting display supports the cognition of clusters very well, and for this purpose it seems to be superior to, for instance, the frequently applied principal components display. In certain situations dedrograms are expected to become simpler to interpret when such complementary ‘cluster display’ is also consulted. An example from analytical chemistry is presented.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180030310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Statistical estimation of the influence of mineralization methods on the results of heavy metals determination in cereals by the DPASV method (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 327 (1987), S. 679-683 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The elements Cd, Cu, Pb and Zn have been determined in wheat, barley and oats by differential pulse anodic stripping voltammetry after wet mineralization, mineralization by dry ashing or mineralization in a PTFE bomb. The procedures are described. The results were evaluated by BASIC programs for one dimensional data evaluation, by principal components plot and by multidimensional analysis of variance. The influences of mineralization procedures on the results are low compared with the different contents in the three cereals particularly for Cd, but also for Pb and Zn. There are no significant differences, in the Cu content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00489161
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Application of partial least-squares regression for signal resolution in differential pulse anodic stripping voltammetry of thallium and lead (1990)
    Weinheim : Wiley-Blackwell
    Electroanalysis 2 (1990), S. 309-312 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This work addresses the problem of signal resolution by partial least-squares regression (PLS) for differential pulse stripping voltammograms. The performance of PLS is demonstrated for an example of calibration with mixtures of two analytes (Tl+ and Pb2+) with strongly overlapping voltammograms. The accuracy of the determination of concentrations for validation mixtures was found to be considerably higher with PLS than with simple evaluation using currents observed at two potentials (requiring resolution of a system of two linear equations with two unknowns). Hence, PLS is recommended for computer-assisted, on-line voltammetric analysis of multicomponent systems.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140020408
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    Paper (German National Licenses)
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