The influence of polynuclear zirconium species on direct titration of zirconium with edta

Pilkington, E. S.; Wilson, W.B.

doi:10.1016/s0003-2670(01)84949-7

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…Therefore, the average hydrodynamic radius of the solution species under various Zr-Ac concentrations was measured by DLS at several pH values. a report of Pilkington, et al 7 Unfortunately, no significant signal was obtained on DLS at a concentration of less than 0.1 mol dm -3 of Zr-Ac. Therefore, their sizes of zirconiumhydrolyzed polymers could not be clarified in this experiment.…”

Section: Effects Of the Phmentioning

confidence: 84%

“…6 Pilkington et al mentioned that accurate results in EDTA titration of zirconium could only be obtained after zirconium ions were converted to a depolymerized form. 7 Therefore, we studied a colloidal titration method as a means to measure the concentration of zirconium conveniently as it exists in the aqueous solution in a polynuclear configuration.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

et al. 2004

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Zirconium chemicals are used in a wide range of industries, and with advances in modern technology, the diversity of their applications has increased. 1 In particular, tetragonal zirconia is one of the most important zirconium compounds for ceramic use, with excellent mechanical properties, such as high structure toughness, strength, and hardness. 2 We have studied the effective use of some zirconium oxy-salts as a depressive and fluidizing material of ceramic slurries, 3,4 and have developed a new direct-casting method based on aqueous-acidic high solids loading alumina slurries stabilized with zirconium acetate. 5When the slurries were prepared, the concentration of zirconium oxy-salt was an important factor, and a simple and convenient determination of aqueous zirconium was required. However, the determination of zirconium is not very easy because zirconium(IV) has a marked tendency to form polynuclear hydroxy group-bridged zirconium species (polymerization) in aqueous solutions.6 Pilkington et al. mentioned that accurate results in EDTA titration of zirconium could only be obtained after zirconium ions were converted to a depolymerized form. Therefore, we studied a colloidal titration method as a means to measure the concentration of zirconium conveniently as it exists in the aqueous solution in a polynuclear configuration.Colloidal titration is an excellent measurement method for determining the concentration of natural and synthetic polyelectrolytes. [8][9][10][11][12] Titration is based on the reaction between a positively charged polyelectrolyte (polycation) and a negatively charged one (polyanion).When the charges of the polyelectrolytes are neutralized by the addition of oppositely charged polyelectrolytes, the two ployelectrolytes tend to associate and eventually precipitate. According to Terayama, who was the first proposer of colloidal titration, the colloidal titration method has been applied to several poly-charged species, such as proteins and cells. 8 However, their stoichiometries are still not clear. Regarding the reaction between oppositely charged polyelectrolytes, most of the reaction is accurately stoichiometric. As a typical case, an aqueous solution of poly(diallyldimethyl ammonium) chloride (PDADMAC) can be titrated with an aqueous solution of potassium poly(vinyl sulfate) (KPVS) of known concentration. The reaction between oppositely charged polyelectrolytes has been studied on stoichiometry, 9,13-16 the stability constant, 17,18 and the effect of the polymerization degree. 19 A few colloidal titrations were applied to measure metal ions in hydrolyzed, polymeric forms. Kikuchi and Kubota have investigated a chemical reaction of KPVS with a mixture of poly(aluminum chloride), PAC, ([Al2(OH)nCl6-n]m, n = 3, m = 2.5) as an inorganic macromolecule and [2-(diethylamino)ethyl]dextran hydrochloride.The general characteristics of the resultant polyelectrolyte complexes were also studied. 20 Tajima has reported that undeca(11-)tungstocobalt(II)phosphate, [PW11O39Co(H2O)] 5-, was a useful standa...

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Section: Effects Of the Phmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

et al. 2004

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“…Then, the acid treated samples of activated carbons (10 g) were added to a solution of zirconium oxynitrate (100 mL, containing 1.0 g of Zr, pH 1.6) and stirred for 72 h at 298 K. The resultant solids were filtered, washed with distilled water and dried in air to prepare zirconium species impregnated samples. Loading of Zr on the activated carbons was determined by measuring the concentration of Zr in the impregnation solutions before and after the treatment [21,22].…”

Section: Impregnation Of Zirconium Species On Activated Carbonsmentioning

confidence: 99%

Adsorption of Phosphate from Aqueous Solutions onto Zirconium Loaded Activated Carbons Derived from Lignocellulosic Residues

Shindo

Takao

Ikeuchi

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

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Activated carbons from raw materials of lignocellulosic residues such as rice straws, cedar bark, and waste cardboard sludge were prepared by carbonizing the raw materials under N 2 atmosphere at 673-1273 K for 1-12 h, followed by activation under CO 2 atmosphere at 973-1173 K for 0.5-6 h. Zr-loaded activated carbons were also prepared from them by a conventional impregnation method using zirconium oxynitrate solution. The obtained carbon samples were characterized by N 2 adsorption and XRD. Development of microporosity in the activated carbons was dependent upon the precursors and the activation conditions employed. The α s -plot and pore size distribution analyses exhibited that loading of Zr species on the activated carbons in this study did not give significant influences on the microporosity of the activated carbons. A quantitative adsorption of phosphate on the Zr-loaded activated carbons was achieved below pH 9. It was found that the adsorption of phosphate on both activated carbons and Zr-loaded samples was fitted satisfactorily to Langmuir adsorption isotherms. Phosphate adsorption capacities of Zr-loaded activated carbons from rice straws and waste cardboard sludge were evaluated to be 11.1 and 5.97 mg-P g -1 , respectively, which were larger than those of relevant activated carbons used as supports. Application of Dubinin-Radushkevich analysis to the phosphate adsorption isotherms indicates that the adsorption mainly proceeds through an ion exchange mechanism.

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“…Papers describing titrimetric determinations of zirconium deal largely with EDTA titrations with xylenol orange being one of the more popular if not the most popular indicator. Pilkington and Wilson (404) studied the effect of polynuclear zirconium species on the direct titration with EDTA using xylenol orange. Pribil and Veselyr (425) described the conditions for the direct titration of zirconium in 0.3 to 0.637 nitric acid and applied this method (424) to the determination of zirconium in the presence of thorium and titanium.…”

Section: Zirconium and Hafniummentioning

confidence: 99%

“…A "radio release" method for the determination of vanadium in water was used by Gillespie and Richter (164) (29,404,435,529); Th, zirconium Ti (424); Ni, Al (354); Al (556); zircon and ZrCh (61); Mo (452); plus hafnium Hf (148); high temperature materials (281); Zr + ZrC + ZrCL (275); siliceous material (526); Th, Al (477); following chromatographic separation (108); study of indicators (204); rare earths, Th, Ti (423) Arsenazo III: Mg, Al Iron II-permanganate: Mixed oxidation states of V (338); study of interferences (461, 464); Cr (437); steel, Fe (99), catalysts (522) Sodium nitrite-permanganate: Steel (352) Permanganate: Ammonium molybdovanadophosphate (426) Cerium(IV): Catalysts (167) Mercury-cerium(IV): Mo-V (116) Sodium-lead alloy-dichloromate or permanganate or cerium(IV):…”

Section: Vanadiummentioning

confidence: 99%

Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

Bachman¹,

Banks²

1967

Anal. Chem.

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The influence of polynuclear zirconium species on direct titration of zirconium with edta

Cited by 17 publications

References 15 publications

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

Adsorption of Phosphate from Aqueous Solutions onto Zirconium Loaded Activated Carbons Derived from Lignocellulosic Residues

Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

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