Colorimetric Determination of Iron in Water With o‐Phenanthroline

Caldwell, David H; Adams, R.B.

doi:10.1002/j.1551-8833.1946.tb16130.x

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…Total dissolved iron (Fe (II) + Fe (III)) can also be determined by the orthophenonthroline complexometric method [45], which based on the reduction of Fe (III) to Fe (II) using the reducing agent hydroxylamine hydrochloride (NH 2 OH.HCl). To determine the amount of dissolved ferrous iron in solution, this reducing agent was omitted.…”

Section: 4 Iron Content and Morphology Of Beadsmentioning

confidence: 99%

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Hammouda

Fourcade

Assadi

et al. 2016

Applied Catalysis B: Environmental

110

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Fe-ABs were fabricated by simple gelation procedure at 25 °C. The incorporation of iron on beads was confirmed by EDS results. The Fe-ABs catalyst present good stability and can be used for at least four times without obvious decrease in activity. Mineralization pathways of indole was proposed. In this work the characterization and the performance of iron immobilized in alginate beads (Fe-ABs) as catalyst for heterogeneous electro-Fenton (EF) treatment of a malodorous compound, indole, was investigated. Experimental results demonstrated that indole was effectively removed through the electro-Fenton process; while in the considered experimental conditions, the performances of EF were only slightly improved by the addition of UVA radiation. The most efficient operating conditions were achieved at pH 3.0 in the presence of 200 mg.L-1 Fe-ABs catalyst (corresponding to an average iron concentration of 64 mg L-1) with a current density of 0.53 mA cm-2. Under these conditions, 60 min were sufficient to completely degrade 20 mg L −1 of indole, whose removal was found to obey the pseudo-first order model. In terms of organic carbon removal, about 90% mineralization yield was reached in the optimal conditions for 7 h heterogeneous electro-Fenton treatment time. UPLC-MS/MS analysis was applied to identify and follow the evolution of indole oxidation products. Five stable organics intermediates were observed and four of them were identified as dioxindole, isatin, oxindole and anthranilic acid. A reaction sequence was therefore proposed for indole degradation according to the detected products. Subsequent attack of these intermediates by •OH radicals led to the formation of short chain acids such as succinic, acetic, oxamic and oxalic identified by ion-exclusion chromatography.

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Section: 4 Iron Content and Morphology Of Beadsmentioning

confidence: 99%

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Hammouda

Fourcade

Assadi

et al. 2016

Applied Catalysis B: Environmental

110

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“…The relaxivities were plotted against the iron concentration and the relaxivities per concentration were determined from the gradient of the slope. Iron concentration was measured using the 1,10-phenanthroline iron quantification assay [39].…”

Section: In Vitro Relaxivity Measurementsmentioning

confidence: 99%

Facile aqueous, room temperature preparation of high transverse relaxivity clustered iron oxide nanoparticles

Hobson¹,

Weng²,

Thanh

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Chitosan T2-weighted Colloid Relaxivity A B S T R A C TClustering superparamagnetic iron oxide nanoparticles (SPIONs) is one method of providing the biomedical benefits of larger SPIONs [e.g. superior T2 weighted magnetic resonance imaging (MRI) contrast] without increasing particle size. The work presented herein, describes the facile synthesis of clustered SPIONs that are suitable for MRI applications, by using a chitosan based polymer: N-palmitoyl-N-monomethyl-N-N-dimethyl-N-N-N-trimethyl-6-O-glycolchitosan (GCPQ) and aqueous nanoprecipitation followed by probe sonication, in the absence of organic solvents or elevated temperatures. The resulting clustered SPIONs consist of individual 8 nm iron oxide nanoparticles clustered into a 150 nm particle with a positive zeta potential (+23 mV) at neutral pH. X-ray diffraction confirms the presence of crystalline magnetic iron oxide, while magnetometer experiments show the clustered SPIONs are superparamagnetic giving an overall M s of 63.5 ± 1.3 emu g −1 . Relaxometry analyses revealed that the clustered SPIONs (inclusive of coatings) had a high r 2 value of 294.8 mM −1 s −1 and an r 2 /r 1 of 21.1 making the clustered SPIONs suitable for T2 weighted (negative) MRI contrast imaging applications. The resulting clustered SPIONs demonstrate that highly sensitive T2 contrast agents may be produced in mild room temperature conditions, without the need for organic solvents or low molecular weight surfactants.

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“…Dissolved iron concentration [44] The concentration of dissolved iron ions (Fe(III)+Fe(II)) was measured by colorimetric determination with 1,10 phenantroline as complexic agent [16]. Its absorbance was measured at 510 nm by a Shimadzu UV-1280 spectrophometer.…”

Section: Hydrogen Peroxide Quantificationmentioning

confidence: 99%

Iron oxide nanoparticles as heterogeneous electro-Fenton catalysts for the removal of AR18 azo dye

Hafaiedh

Fourcade

Bellakhal

et al. 2018

Environmental Technology

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Iron oxides nanoparticle as heterogeneous electro-Fenton catalysts for the removal of AR18 azo-dye Heterogeneous electro-Fenton mineralization of Acid Red 18 (AR18) in aqueous solution was studied with magnetite Fe3O4 (MNPs) and hematite Fe2O3 (HNPs) nanoparticles as catalysts. High mineralization yields of AR18 were obtained with magnetite, 81% TOC removal after 180 min of electrolysis in 40 mg.L-1 Fe3O4, pH 3.0, at 50mA of current intensity and in 50 mM Na2SO4. In order to explain the obtained mineralization yield achieved with MNPs, the quantification of hydrogen peroxide (H2O2), hydroxyl radical (•OH) and iron leaching were performed at 50 and 100 mA. From the high iron concentration found in the bulk solution and the slight impact of the catalyst mass concentration on TOC removal, the formation of hydroxyl radicals occurs mainly through homogeneous process. In the presence of hydroxyl radical scavenger, degradation remained total after 15 min showing the involvement of a direct electrochemical oxidation of the dye at the electrode surface. The hydroxyl radical oxidation is responsible for at least 50% of mineralization.

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Colorimetric Determination of Iron in Water With o‐Phenanthroline

Cited by 24 publications

References 5 publications

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Facile aqueous, room temperature preparation of high transverse relaxivity clustered iron oxide nanoparticles

Iron oxide nanoparticles as heterogeneous electro-Fenton catalysts for the removal of AR18 azo dye

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