Spectrophotometric Determination of Phosphate Anion Based on the Formation of Molybdophosphate in Ethylene Glycol-Water Mixed Solution

Katano, Hajime; Ueda, Tadaharu

doi:10.2116/analsci.27.1043

Cited by 15 publications

(4 citation statements)

References 25 publications

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“…Protonated amine groups readily bind molybdate anionic species (preferentially polynuclear as previously shown for chitosan-based sorbents, [48]); while increasing the pH, the deprotonation reduces the ability of these groups to bind molybdate species. The formation of phosphomolybdic species in acidic solutions is a well-known reaction that is frequently used for phosphate analysis [49]. Therefore, the sorption of molybdate species may proceed through the interactions of molybdate with phosphate groups and with protonated amine groups, under pH control (metal speciation, protonation/deprotonation of reactive groups).…”

Section: Table 2amentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3-4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g − 1 and 2.09 mmol Mo(VI) g − 1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30-40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5-3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).

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Section: Table 2amentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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“…[15][16][17][18][19][20][21][22][23][24] As we know, traditional analytical methods are highly accurate and widely used, however, they suffer from more or less inherent drawbacks which limit their practical applications such as, the need for a proficient user, infrastructure backup, laborious procedures, time-consuming processing and expensive instruments. There are various conventional methods for phosphate analysis such as electrochemical analysis, 25 chromatography, 26 spectrophotometry, 27 and enzymatic biosensors. 28 Also, conventional analytical approaches are insufficient when analytes are present together in a sample and this necessitates the development of selective receptors.…”

Section: Introductionmentioning

confidence: 99%

Disposable paper-based PET fluorescence probe linked with calix[4]arene for lithium and phosphate ion detection

et al. 2022

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“…The formation of the colored heteropolymolybdate species has been utilized in colorimetric and spectrophotometric assay of oxidanions [1][2][3] and in the color reaction of the reducing sugar assay. The Somogyi-Nelson reducing saccharide assay 4,5 is based on the reduction of Cu(II) to Cu(I) by the saccharides in an alkaline solution and the molybdenum blue formation by Cu(I) in a strongly acidic As(VI)-Mo(VI) solution.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric Determination of Glucosamine and Glucose Based on the Formation of Blue Molybdosilicate Anion and Its Application to the Assay of Saccharifying Enzyme

et al. 2013

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A simple and convenient method of reducing monosaccharide assay is proposed. A Si(IV)-Mo(VI) solution (pH 4.9) was yellow due to the formation of the 11-and/or 12-molybdosilicate(VI) anions. By the addition of a reducing saccharide, glucosamine, the mixture turned to blue gradually, indicating that the Mo(VI) species was reduced by the saccharide to form a blue molybdosilicate anion. The molybdenum blue formation occurred more quickly when a water-miscible organic solvent, dimethyl sulfoxide, was added to the Si(IV)-Mo(VI) solution. Thus, 0.01% level glucosamine can be determined colorimetrically with microtiter plate. Oligochitosan would not interfere with the determination of the glucosamine at the same concentration. Also, a remarkable blue color development of the Si(VI)-Mo(VI) solution was observed by the addition of glucose. On the other hand, maltose, cellobiose, and water-soluble starch at the same concentration level gave no significant coloration of the reaction mixture. Thus, the present monosaccharide assay can be applied advantageously to evaluate the saccharification to produce glucosamine and glucose.

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Spectrophotometric Determination of Phosphate Anion Based on the Formation of Molybdophosphate in Ethylene Glycol-Water Mixed Solution

Cited by 15 publications

References 25 publications

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Disposable paper-based PET fluorescence probe linked with calix[4]arene for lithium and phosphate ion detection

Colorimetric Determination of Glucosamine and Glucose Based on the Formation of Blue Molybdosilicate Anion and Its Application to the Assay of Saccharifying Enzyme

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