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A foam-like mesoporous polymer of melamine-formaldehyde (mPMF) was synthesized and further deposited on disposable screen-printed electrodes (SPEs) for the electroanalysis of Pb(2+) ions in blood. Investigations indicate that the prepared mPMF is ultrastable in water, showing a mesoporous structure and an amine-rich composition, as characterized by electronic microscopy images and IR spectra. Importantly, it possesses a highly-selective chelating ability and a powerful absorbent capacity for Pb(2+) ions. By way of solid-state PbCl2 voltammetry, the mPMF-modified sensor could allow for the detection of Pb(2+) ions in one drop of blood with a high detection selectivity, sensitivity (down to about 0.10 μg L(-1) Pb(2+) ions) and reproducibility. Such a simple "one-drop-of-blood" electroanalysis method equipped with disposable SPEs and a portable electrochemical transducer can be tailored for the field-deployable or on-site monitoring of blood Pb(2+) levels in the clinical laboratory.

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“One-drop-of-blood” electroanalysis of lead levels in blood using a foam-like mesoporous polymer of melamine–formaldehyde and disposable screen-printed electrodes