RT journal article
T1 A Novel Polymer Inclusion Membrane-Based Green Optical Sensor for Selective Determination of Iron: Design, Characterization, and Analytical Applications
A1 Sánchez Ponce, Lorena
A1 Casanueva Marenco, María José
A1 Díaz de Alba, Margarita Isabel
A1 Galindo Riaño, María Dolores
A1 Granado Castro, María Dolores
A2 Química Analítica
K1 Iron determination
K1 Iron speciation
K1 Optical sensor
K1 Polymer inclusion membrane
K1 Picolinaldehyde salicyloylhydrazone
AB The design, characterization, and analytical application of a green optical sensor for theselective determination of Fe(II) ions is proposed. The sensor is based on the immobilization ofthe chromogenic reagent picolinaldehyde salicyloylhydrazone (SHPA) within a polymer inclusionmembrane. To reduce solvent usage, the reagent was synthesized using a green mechanochemicalprocedure. The components for sensor preparation were optimized with a sequential simplex methodand the optimal composition was found to be 0.59 g cellulose triacetate (base polymer), 0.04 g SHPA(chemosensor reagent), 4.9 mL dibutyl phthalate (plasticizer), and 38 mL dichloromethane (solvent).The conditions of iron analysis were also optimized resulting in pH 6 for aqueous solution, 90 minexposure time and 10 min short-term stability. The optical sensor showed a linear range from the limitof detection (0.48 µmol L−1) to 54 µmol L−1 Fe(II). The precision of the method was found to be 1.44%and 1.19% for 17.9 and 45 µmol L−1 Fe(II), respectively. The characteristics of the sensor allowedthe design of a Fe(II)/Fe(III) speciation scheme. The methodology was successfully applied to thedetermination of iron in food preservatives, food additives, and dietary supplement. Additionally,the Fe speciation scheme was successfully applied to an agricultural fertilizer.
PB Multidisciplinary Digital Publishing Institute (MDPI)
SN 2073-4360
YR 2023
FD 2023
LK http://hdl.handle.net/10498/31656
UL http://hdl.handle.net/10498/31656
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026