Analytical applications of picolinealdehyde salicyloylhydrazone

Gallego, Mercedes; Garcı́a-Vargas, Manuel; Valcárcel, Miguel

doi:10.1016/0026-265x(82)90020-0

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…As can be seen from the UV-Vis absorbance spectrum (Figure A3 in Appendix A), the maximum absorbance of the Fe(II)-SHPA complex was found in two different wavelengths: 389 and 645 nm. The former allows a more sensitive determination of Fe(II) concentration, but it is subject to interferences because other metal ion complexes show a peak at this wavelength [50][51][52][53]. The latter offers lower sensitivity but higher selectivity.…”

Section: Previous Studiesmentioning

confidence: 99%

“…The average pK values found are 3.5 ± 0.1 (associated with the protonation of the pyridine nitrogen atom) and 9.2 ± 0.1 (associated with the hydroxyl group) [49]. This reagent forms chromogenic complexes with different metal ions such as Al(III) (blue fluorescence), Fe(II) (green complex) [50], or Bi(III), Co(II), Cu(II), Pd(II), Ti(IV), V(V), and Zn(II) as yellow complexes [51][52][53]. This chromogenic group -N=C-C=N-NH-CO of the SHPA can act as a tridentate ligand, which interacts with Fe(II), forming an octahedral complex with four five-membered rings [54] (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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A Novel Polymer Inclusion Membrane-Based Green Optical Sensor for Selective Determination of Iron: Design, Characterization, and Analytical Applications

Sánchez-Ponce,

Casanueva-Marenco,

Díaz-de-Alba

et al. 2023

Polymers

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The design, characterization, and analytical application of a green optical sensor for the selective determination of Fe(II) ions is proposed. The sensor is based on the immobilization of the chromogenic reagent picolinaldehyde salicyloylhydrazone (SHPA) within a polymer inclusion membrane. To reduce solvent usage, the reagent was synthesized using a green mechanochemical procedure. The components for sensor preparation were optimized with a sequential simplex method and 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 min exposure time and 10 min short-term stability. The optical sensor showed a linear range from the limit of 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 allowed the design of a Fe(II)/Fe(III) speciation scheme. The methodology was successfully applied to the determination of iron in food preservatives, food additives, and dietary supplement. Additionally, the Fe speciation scheme was successfully applied to an agricultural fertilizer.

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Section: Previous Studiesmentioning

confidence: 99%