Iron speciation in natural waters by sequential injection analysis with a hexadentate 3-hydroxy-4-pyridinone chelator as chromogenic agent

Miranda, Joana L. A.; Mesquita, Raquel B. R.; Nunes, Ana; Rangel, Maria; Rangel, António O. S. S.

doi:10.1016/j.talanta.2015.05.062

Cited by 20 publications

(10 citation statements)

References 14 publications

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“…Various extraction procedures for Fe species separation have been proposed, based generally on ion exchange resins [3,4], liquid-liquid and microextraction [5][6][7], cloud point extraction [8] and solid phase extraction (SPE) [9][10][11][12][13][14]. Highly selective ion imprinted polymers, incorporated as efficient sorbents in SPE procedures have been recently used in nonchromatographic speciation procedures.…”

Section: Introductionmentioning

confidence: 99%

Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

Mitreva

Dakova

Karadjova

2017

Microchemical Journal

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In this paper, we proposed a procedure for the determination of Fe(III) and total Fe(II)+Fe(III) in wine samples employing newly synthesized Fe(II) ion imprinted polymer (Fe(II)-IIP) as a sorbent incorporated in dispersive solid phase extraction. Cross-linked precipitation copolymerization using 4-vinylpyridine (functional monomer), trimethylolpropane trimethacrylate (cross-linking agent) and 2,2′-bipyridyl as a specific for Fe(II) ligand was used for the synthesis of Fe(II)-IIP. The optimization experiments showed quantitative sorption of both Fe(II) and Fe(III) on the surface of Fe(II)-IIP at pH 7, however selective sorption of only Fe(II) could be achieved in the presence of fluoride ions as a masking agent for Fe(III). The Langmuir adsorption isotherm best described the adsorption of Fe(II) on the surface of the sorbent on the at least two kinds of binding sites with higher and lower affinities as defined by Scatchard plot. The analytical procedure developed allows the determination of iron(III) and total Fe(II)+Fe(III) in wine samples, with limits of quantification 0.1 mg L-1. The relative standard deviation varied in the range 3-7% for Fe content 0.1-10 mg L-1 .

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Section: Introductionmentioning

confidence: 99%

Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

Mitreva

Dakova

Karadjova

2017

Microchemical Journal

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“…The membrane-based sensor may not be as ultrasensitive as other reported methods, 7,8 as shown in Table 2, but it offers a simple one-step procedure with an easy colorimetric readout. Most of the reported methods are multistep 4 that involve complex methodologies, 2,6 or device fabrication 18,19 that require a high-degree of expertise.…”

Section: Figure Of Meritsmentioning

confidence: 99%

“…[4][5][6][7][8][9] Even though most of these technique are highly selective as well as sensitive, but lack of easy operational protocols along with complex methodology limit their usage in field applications. The rapidly growing issues of water pollution make it an ambulatory necessity to design sensing devices that are easy to operate and read by non-technical personnel.…”

Section: Introductionmentioning

confidence: 99%

A Highly Structured 1,10-Phenanthroline Arrayed Hydrophobic Sulfone Membrane Platform for the Rapid Determination and Speciation of Fe2+/Fe3+ Ions in Water

et al. 2017

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An optical assay for the rapid determination and chemical speciation of Fe 2+ /Fe 3+ species has been proposed for the first time on a polyether sulfone (PES) membrane platform. The small pore size and low wettability (θ ~82 ) of the membrane disallowed the dissipation of analyte droplets on the surface, thus localizing it onto nanoliter arrayed 1,10-phenanthroline spots. Under optimized conditions and within ~5 min, an acceptable limit of detection (0.1 μg mL -1 ) and linear dynamic range (1 -100 μg mL -1 ) were achieved. The proposed method was also successfully applied for indirect determination of Fe 3+ ions in synthetic samples after reduction to Fe 2+ using SO2. The performance of the proposed sensor was validated for its robustness and stability. Due to high selectivity and accuracy, the method was satisfactorily applied for the analysis of Fe 2+ /Fe 3+ species in marine water samples. The proposed method is an easy and low-cost system coupled with good reproducibility and ruggedness, applicable for point-of-use testing.

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“…Photometric method is used in coupling with sorption preconcentration in order to improve its sensitivity and selectivity. Iron may be determined directly in the sorbent phase [ 16 – 21 ] or in the solution after desorption [ 22 – 24 ]. Sorbents based on ion-exchange resins [ 16 – 18 ], polymethacrylate matrixes [ 20 ], silica [ 19 , 24 ], cellulose [ 22 ], and naphthalene [ 23 ] are suggested.…”

Section: Introductionmentioning

confidence: 99%

Separation and Determination of Fe(III) and Fe(II) in Natural and Waste Waters Using Silica Gel Sequentially Modified with Polyhexamethylene Guanidine and Tiron

Didukh

Лосев

Borodina

et al. 2017

Journal of Analytical Methods in Chemistry

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Silica gel, sequentially modified with polyhexamethylene guanidine and pyrocatechin-3,5-disulfonic acid (Tiron), was suggested for sorption separation and determination of Fe(III) and Fe(II). It was found that quantitative extraction of Fe(III) and its separation from Fe(II) were attained at pH 2.5–4.0, while quantitative extraction of Fe(II) was observed at pH 6.0–7.5. An intensive signal with g = 4.27, which is characteristic for Fe(III), appeared in EPR spectra of the sorbents after Fe(II) and Fe(III) sorption. During interaction between Fe(II) and Tiron, fixed on the sorbent surface, its oxidation up to Fe(III) occurred. Red-lilac complexes of the composition FeL3 were formed on the sorbent surface during sorption regardless of initial oxidation level of iron. Diffuse reflectance spectrum of surface complexes exhibited wide band with slightly expressed maxima at 480 and 510 nm. Procedures for separation and photometric determination of Fe(III) and Fe(II) at the joint presence and total Fe content determination as Fe(II) in waste and natural waters was developed. The limit of detection for iron was 0.05 μg per 0.100 g of the sorbent. The calibration graph was linear up to 20.0 μg of Fe per 0.100 g of the sorbent. The RSD in the determination of more than 0.2 μg of Fe was less than 0.06.

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Iron speciation in natural waters by sequential injection analysis with a hexadentate 3-hydroxy-4-pyridinone chelator as chromogenic agent

Cited by 20 publications

References 14 publications

Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

A Highly Structured 1,10-Phenanthroline Arrayed Hydrophobic Sulfone Membrane Platform for the Rapid Determination and Speciation of Fe2+/Fe3+ Ions in Water

Separation and Determination of Fe(III) and Fe(II) in Natural and Waste Waters Using Silica Gel Sequentially Modified with Polyhexamethylene Guanidine and Tiron

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