Moment analysis for evaluation of flow-injection manifolds

The applicability of the exponentially modified Gaussian (EMG) peak-shape model to a variety of flow-injection manifolds is explored. Using previously derived equations and manual calculations, the second moment (variance) is employed as the fundamental descriptor of flow-injection response curves....

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Bibliographic Details
Published in:Analytica chimica acta 1990, Vol.229 (1), p.35-46
Main Authors: Brooks, Stephen H., Dorsey, John G.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
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Summary:The applicability of the exponentially modified Gaussian (EMG) peak-shape model to a variety of flow-injection manifolds is explored. Using previously derived equations and manual calculations, the second moment (variance) is employed as the fundamental descriptor of flow-injection response curves. The applicability of the EMG model is verified over a wide range of flow rates (0.2–1.7 ml min −1 for coiled, knitted and Serpentine II manifolds, single-bead string reactors (SBSR) and a coiled reactor with a single confluence point. The Serpentine II reactor exhibits decreased dispersion at higher flow-rates. The determination of the variance of flow-injection response curves reveals that for the examined SBSR and Serpentine II manifolds, reagent consumpsion is decreased as the flow-rate is increased from intermediate (1.0 ml min −1 to high flow rates (1.7 ml min −1. Determination of peak variance is shown to yield unique information in the time domain which assists in the optimum design and evaluation of performance in flow manifolds.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)85107-7