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Linear dynamic range for (a) lidocaine and (b) verapamil, and typical spectra of lidocaine (c) and verapamil (d) with concentrations in blood of 20 ng mL−1 and 10 ng mL−1, respectively, obtained with Mini 11. Silica-coated paper (0.27 mm thick) with 9:1 dichloromethane/isopropanol.
