Potentiometric MIP-Modified Screen-Printed Cell for Phenoxy Herbicides Detection

Camilla Zanoni, Stefano Spina, Lisa Rita Magnaghi, Marta Guembe-Garcia, Raffaela Biesuz and Giancarla Alberti ()
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Camilla Zanoni: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Stefano Spina: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Lisa Rita Magnaghi: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Marta Guembe-Garcia: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Raffaela Biesuz: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Giancarla Alberti: Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy

IJERPH, 2022, vol. 19, issue 24, 1-12

Abstract: In this study, a molecularly imprinted polymer (MIP)-based screen-printed cell is developed for detecting phenoxy herbicides using 2-methyl-4-chlorophenoxyacetic acid (MCPA) as the template. MCPA is a phenoxy herbicide widely used since 1945 to control broadleaf weeds via growth regulation, primarily in pasture and cereal crops. The potentiometric cell consists of a silver/silver chloride pseudo-reference electrode and a graphite working electrode coated with a MIP film. The polymeric layer is thermally formed after drop-coating of a pre-polymeric mixture composed of the reagents at the following molar ratio: 1 MCPA: 15 MAA (methacrylic acid): 7 EGDMA (ethylene glycol dimethacrylate). After template removal, the recognition cavities function as the ionophore of a classical ion selective electrode (ISE) membrane. The detected ion is the deprotonated MCPA specie, negatively charged, so the measurements were performed in phosphate buffer at pH 5.5. A linear decrease of the potential with MCPA concentration, ranging from 4 × 10 −8 to 1 × 10 −6 mol L −1 , was obtained. The detection limit and the limit of quantification were, respectively, 10 nmol L −1 and 40 nmol L −1 . A Nernstian slope of about −59 mV/dec was achieved. The method has precision and LOD required for MCPA determination in contaminated environmental samples.

Keywords: 2-methyl-4-chlorophenoxyacetic acid (MCPA); herbicides; screen-printed electrodes; molecularly imprinted polymers (MIP); MIP-based electrodes; potentiometric screen-printed cell; electroanalysis; analytical chemistry (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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