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. 2025 Mar 31;417(14):3103–3111. doi: 10.1007/s00216-025-05850-y

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© The Author(s) 2025

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Fig. 3 — Absorbance at λ_max = 710 nm and 880 nm for mix standards with varying concentrations of PO₄³⁻ and a fixed concentration of 1 mM OPs. Error bars represent the standard deviation of duplicate experiments. If error bars are not visible, their size is smaller than the marker used to represent the data