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Analytical chemistry v.89 no.2, 2017년, pp.1147 - 1154   SCI SCIE
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Calibrant-Free Analyte Quantitation via a Variable Velocity Flow Cell

Beck, Jason G. (Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, ); Skuratovsky, Aleksander ( Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, ); Granger, Michael C. ( Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, ); Porter, Marc D. ( Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, );
  • 초록  

    In this paper, we describe a novel method for analyte quantitation that does not rely on calibrants, internal standards, or calibration curves but, rather, leverages the relationship between disparate and predictable surface-directed analyte flux to an array of sensing addresses and a measured resultant signal. To reduce this concept to practice, we fabricated two flow cells such that the mean linear fluid velocity, U , was varied systematically over an array of electrodes positioned along the flow axis. This resulted in a predictable variation of the address-directed flux of a redox analyte, ferrocenedimethanol (FDM). The resultant limiting currents measured at a series of these electrodes, and accurately described by a convective–diffusive transport model, provided a means to calculate an “unknown” concentration without the use of calibrants, internal standards, or a calibration curve. Furthermore, the experiment and concentration calculation only takes minutes to perform. Deviation in calculated FDM concentrations from true values was minimized to less than 0.5% when empirically derived values of U were employed. Graphic Abstract


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