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  • 1
    Electronic Resource
    Electronic Resource
    Use of the Kalman filter for multivariate calibration in a real system and its comparison with CLS and pure component calibration methods (1993)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 7 (1993), S. 267-275 
    Details
    ISSN: 0886-9383
    Keywords: Kalman filter ; Multivariate calibration ; Condition number ; Prediction error ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The usefulness of the Kalman filter as an algorithm for calibration in a real system is shown. Results are compared with classical least squares and pure component calibration. The prediction of four priority pollutant chlorophenols in binary, ternary and quaternary mixtures was also carried out by Kalman filtering. The condition number, standard deviation and prediction error have been employed to choose the most suitable wavelength range. Comparison of the standard error of prediction in the validation set shows significant differences between the evaluated chlorophenols, the best results being obtained with Kalman multivariate calibration.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180070405
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Selective determination of Triton-type non-ionic surfactants in different samples by on-line clean-up and FIA (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 337 (1990), S. 389-392 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A FIA method is proposed for the determination of non-ionic surfactants, applying spectrophotometric detection. The method is based on the formation of a “surfactant-K+-picrate” adduct and subsequent extraction into 1,2-dichloroethane. The method can handle samples containing large excesses of ionic and amphoteric surfactants, which are retained on ion-exchange columns inserted in the flow system. Beer's law is obeyed at 380 nm in the 0.02–1.2 mg·l−1 range for Triton-type non-ionic surfactants (X-100, X-405 and WR-1339). Relative standard deviation (n=10) is 0.3% at the 0.5 mg·l−1 level. The method has been applied to several samples and its applicability evaluated by ANOVA statistical comparison with two other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322217
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Voltammetric determination of 4-chloro-3-methylphenol at a glassy carbon electrode (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 193-196 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An electroanalytical study of the 4-chloro-3-methylphenol oxidation process at a glassy carbon electrode in aqueous solution has been carried out using different voltammetric techniques. The results obtained by differential pulse voltammetry allowed the development of a method for the determination of this antiseptic in the ranges 8.0×10−7 – 10.0×10−7, 1.0×10−6 – 10.0×10−6 and 1.0×10−5 – 7.0×10−5 mol l−1, using ΔE=50 mV. The coefficient of variation is 2.3% for a concentration of 5.0×10−6 mol l−1, with a limit of detection of 2.0×10−7 mol l−1. Good results were obtained by applying the proposed differential pulse voltammetric method to the determination of 4-chloro-3-methylphenol in pharmaceutical and cosmetric samples initially containing or spiked with this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324409
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Selective determination of benzo(ghi)perylene in β-cyclodextrin medium (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 337 (1990), S. 366-368 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A fluorimetric study of PAHs in β-CD medium has been carried out. Maximum emission of some PAHs is shifted to longer wavelengths and sensitivisation phenomena also occur. This allowed the development of methods for the determination of some PAHs. Benzo(ghi)perylene is determined in the presence of phenanthrene, chrysene, fluorene, acenaphthene and naphthalene, with errors being lower than 2% for a benzo(ghi)perylene:phenanthrene ratio below 1:100. The determination of other pairs is also possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322212
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    Paper (German National Licenses)
    Fulltext
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