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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 30 (1990), S. 220-222 
    ISSN: 1612-1112
    Keywords: Chromatography ; Quantitative analysis ; Resolution of overlapped peaks ; Exponentially-modified Gaussian function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Based on the exponentially modified Gaussian (EMG) function, a new approach is presented for the quantitation of a partially overlapped peak pair. This approach can be employed in a wide range of peak area ratio and asymmetry, provided that the relative valley between the two peaks is not greater than 55%. The first peak area is calculated by the use of the ratio of the front half-width at height fraction 0.1 to that at heigt fraction 0.5. The second peak area is calculated by subtracing the first peak area from the total area which is provided by a microprocessor-based integrator. The relative error for the first peak never exceeds ±5%, but this is not always the case for the second peak. The relative error for the second peak depends not only on the accuracy of the total area and that of the first peak area but on area ratio as well.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 30 (1990), S. 400-404 
    ISSN: 1612-1112
    Keywords: Chromatography general ; Resolution function ; Skewed peaks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The widely used resolution criterion which is based on the individual base-line widths of two peaks is invalid in practical situations. In this paper, a simple resolution function is presented. All the necessary data for calculating the resolution are directly measurable from the experimental chromatogram. It is shown that this function can be used to characterize the resolution in non-ideal situations where the areas of the two peaks that overlap are different and/or the peaks are non-symmetrical.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 31 (1991), S. 595-599 
    ISSN: 1612-1112
    Keywords: Chromatography general ; Overlapping peaks ; Statistical moment analysis ; Deconvolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary By using a parameter determined from the leading half of the peak to describe the peak asymmetry, a method for the calculation of statistical moments of overlapping peaks is developed. This approach is also applicable to the deconvolution of partially overlapping peaks. The advantage of this method over the traditional summation method for the statistical moment analysis of overlapping peaks is significant.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Organophosphate pesticides ; Vegetables ; Pesticide residue analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and efficient multiresidue extraction procedure using ethyl acetate and sodium sulfate has been applied to the analysis of diazinon, methamidophos, chlorpyrifos, malathion, parathion, parathion-methyl, dimethoate and monocrotophos residues in many different kinds of vegetables. No cleanup step was required Concentrated extracts were analysed by gas chromatography with flame photometric detection in phosphorus mode. Recovery studies were performed in six kinds of matrices at two fortification levels. Recoveries were in the range 80–115%. The limit of quantification of the analytical method has been estimated as 0.01 ppm for diazinon, methamidophos and malathion, 0.03 ppm for chlorpyrifos, parathion, parathion-methyl and dimethoate and 0.1 ppm for monocrotophos. Experiments showed that potentially it should be possible to develop a rapid and universally applicable method for organophosphate pesticide residues in different matrices.
    Type of Medium: Electronic Resource
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