Determination of the iron oxide content in bauxite: comparing ICP-OES with UV–VIS and volumetric analysis

Ostojić, Gordana; Lazić, Dragica; Zeljković, Saša

doi:10.1007/s11696-020-01305-z

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…The beads average 50 nm in diameter 63 . The iron concentration of CD25 microbeads was determined by acid dissolution and established UV–VIS spectrophotometric method 25 , 64 . CD25 microbeads were measured at 2.24 mgFe/ml.…”

Section: Methodsmentioning

confidence: 99%

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Khurana

Martí

Powell

et al. 2022

Sci Rep

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The success of several cell-based therapies and prevalent use of magnetic resonance imaging (MRI) in the clinic has fueled the development of contrast agents for specific cell tracking applications. Safe and efficient labeling of non-phagocytic cell types such as T cells nonetheless remains challenging. We developed a one-stop shop approach where the T cell sorting agent also labels the cells which can subsequently be depicted using non-invasive MRI. We compared the MR signal effects of magnetic-assisted cell sorting microbeads (CD25) to the current preclinical gold standard, ferumoxytol. We investigated in vitro labeling efficiency of regulatory T cells (Tregs) with MRI and histopathologic confirmation. Thereafter, Tregs and T cells were labeled with CD25 microbeads in vitro and delivered via intravenous injection. Liver MRIs pre- and 24 h post-injection were performed to determine in vivo tracking feasibility. We show that CD25 microbeads exhibit T2 signal decay properties similar to other iron oxide contrast agents. CD25 microbeads are readily internalized by Tregs and can be detected by non-invasive MRI with dose dependent T2 signal suppression. Systemically injected labeled Tregs can be detected in the liver 24 h post-injection, contrary to T cell control. Our CD25 microbead-based labeling method is an effective tool for Treg tagging, yielding detectable MR signal change in cell phantoms and in vivo. This novel cellular tracking method will be key in tracking the fate of Tregs in inflammatory pathologies and solid organ transplantation.

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Section: Methodsmentioning

confidence: 99%

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Khurana

Martí

Powell

et al. 2022

Sci Rep

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“…Deep HDS requires supports with high surface areas, enhanced pore sizes, higher fraction of mesopores and small macropores, larger pore volumes allowing increased exposure of active sites and better dispersion of active components and their availability to large sulphur molecules. Due to these reasons, the conventionally used γ-alumina (γ-Al2O3) support is a far less efficient option compared to other supports like highly porous silicas, which are increasingly attractive [5][6][7][8][9][10]. Their main advantages for use as catalyst supports are: high surface areas of about 600-1300 m 2 /g and huge pore volumes; uniform topology providing high dispersion of metal nanoparticles and easy access of the reactants to the active sites; excellent mechanical properties and hydrothermal stability for demanding reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Desulphurisation of dibenzothiophene and 4,6–dimethyl dibenzothiophene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: kinetic parameters estimation and modelling

Prokić-Vidojević

Glišić

Pešić

et al. 2022

Hem Ind

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Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography?mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on ? and ? active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.

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“…2017, Birinci and Gok 2021), and a greater loss of alumina to red mud during the desilicification process (Smith 2009). Greater concentrations of impurities in the Bayer liquor, such as Fe, Ti, V and Ca adversely affect the aluminium hydroxide precipitation of the Bayer process (Ostojić and Zeljkovi 2021). For refractory grade bauxite, Fe 2 O 3 , SiO 2 and TiO 2 impurities lead to development of low melting phases during calcination and thereby degrade refractory properties (Nandi et al .…”

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confidence: 99%

A Single Step Acid Assisted Microwave Digestion Method for the Complete Dissolution of Bauxite and Quantitation of its Composition (Al₂O₃, Fe₂O₃, SiO₂, TiO₂, Cr₂O₃, MgO, MnO and V₂O₅) by ICP‐AES

Ankam

Rastogi

Thangavel

et al. 2023

Geostandard Geoanalytic Res

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The method was validated with respect to ruggedness, linearity, trueness, precision, limit of detection (LOD), limit of quantification (LOQ), working range and measurement uncertainties by analysing a bauxite reference material (Alcan BXT-12) and four certified reference materials (IPT-131, BXBA-4, NIST SRM 600, NIST SRM 697). The expanded uncertainties obtained for Al 2 O 3 (40.0%), Fe 2 O 3 (17.0%), SiO 2 (20.3%), TiO 2 (1.31%), Cr 2 O 3 (0.024%), MgO (0.05), MnO (0.013), and V 2 O 5 (0.60%), were 0.80, 0.40, 0.50, 0.033, 0.0008, 0.002, 0.0007 and 0.002 respectively, which are fit for the intended use to characterise bauxite. The developed method was also evaluated through participation in an interlaboratory comparison exercise organised by the Jawaharlal Nehru Aluminium Research Development and Design Centre (JNARDDC), Nagpur, India, using bauxite sample (BXT-JNA), with satisfactory z-scores achieved.

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Determination of the iron oxide content in bauxite: comparing ICP-OES with UV–VIS and volumetric analysis

Cited by 6 publications

References 16 publications

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Desulphurisation of dibenzothiophene and 4,6–dimethyl dibenzothiophene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: kinetic parameters estimation and modelling

A Single Step Acid Assisted Microwave Digestion Method for the Complete Dissolution of Bauxite and Quantitation of its Composition (Al₂O₃, Fe₂O₃, SiO₂, TiO₂, Cr₂O₃, MgO, MnO and V₂O₅) by ICP‐AES

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Determination of the iron oxide content in bauxite: comparing ICP-OES with UV–VIS and volumetric analysis

Cited by 6 publications

References 16 publications

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Cell sorting microbeads as novel contrast agent for magnetic resonance imaging

Desulphurisation of dibenzothiophene and 4,6–dimethyl dibenzothiophene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: kinetic parameters estimation and modelling

A Single Step Acid Assisted Microwave Digestion Method for the Complete Dissolution of Bauxite and Quantitation of its Composition (Al2O3, Fe2O3, SiO2, TiO2, Cr2O3, MgO, MnO and V2O5) by ICP‐AES

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A Single Step Acid Assisted Microwave Digestion Method for the Complete Dissolution of Bauxite and Quantitation of its Composition (Al₂O₃, Fe₂O₃, SiO₂, TiO₂, Cr₂O₃, MgO, MnO and V₂O₅) by ICP‐AES