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. 2023 Dec 2;191(1):3. doi: 10.1007/s00604-023-06029-x

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Calibration performed in the microFIA at optimal conditions. (A) Analytical signal (λ = 525 nm) at different concentrations, (B) blank and (C) calibration plot. The equation of the calibration curve is Voltage = 0.00063 (± 0.00002) [Fe(III)]—0.12 (± 0.09) (r² = 0.996; n=5 in triplicate). Operational conditions are injection volume 25 µL, carrier flow rate 0.33 mL/min, diluent flow rate 0.39 mL/min, reagent flow rate 0.36 mL/min, and the ethanol flow rate 1.36 mL/min