A new strategy for RRS-based determination of phosphate with a bifunctional Fe 3 O 4 magnetic nanoparticle surface molecularly imprinted polydopamine probe

• Published in: Analytical methods
• Main Authors: Wan, Wenxin, Yang, Jie, Wen, Guiqing, Liang, Aihui, Jiang, Zhiliang
• Format: Journal Article
• Language: English
• Published: England 21.05.2024
• ISSN: 1759-9660; 1759-9679
• DOI: 10.1039/D4AY00035H

In this paper, a magnetic nanoparticle surface molecularly imprinted polydopamine RRS probe Fe O @MIP was prepared using phosphomolybdic acid (PMo) as the template, Fe O magnetic nanoparticles as the substrate and dopamine hydrochloride (PD) as the monomer and crosslinking agent for the determination of PO . Under acidic conditions, phosphomolybdic acid is formed by the reaction of PO with ammonium molybdate (MSA), which can be imprinted with the Fe O @MIP probe surface and reduced to phosphomolybdic blue (PMoB) by ascorbic acid (Aa). Strong resonance Rayleigh scattering energy transfer (RRS-ET) occurs between the probe and PMoB, resulting in a decrease in the RRS signal value. A new, simple and selective RRS method for the determination of PO in water samples was developed. The linear range of this method is 1-22.5 μmol L , and the detection limit (DL) is 0.49 μmol L . Furthermore, the magnetic enrichment ability of Fe O @MIP is discussed. Experimental data show that even 0.2 μmol L of phosphate can be detected within a 20% error range.