The state of molybdenum (VI) in perchloric acid solutions

Freedman, Meyer L.

doi:10.1016/0022-1902(63)80244-4

Cited by 20 publications

(5 citation statements)

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“…In the acidic region, the existence of dimeric cations, HMo 2 O + 6 , H 2 Mo 2 O 2+ 6 , and Mo 2 O 2+ 5 , has been suggested (19,21,22,25) in the more concentrated solutions of molybdenum, [Mo] > 2 × 10 −3 M. Because, in the present study, the concentration of molybdenum in the aqueous phases was smaller than 2 × 10 −3 M, the monomer-dimer interconversion can be neglected.…”

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 80%

“…The formation of heptamolybdate ion, Mo 7 O 6− 24 , has been studied in the range (10,15) (10,15,(19)(20)(21)(22)(23)(24)(25)(26) in the region of pH < 1. As shown in Equation (1), the formation of nonstoichiometric polymers proceeds with an increase of [H + ], but in more acidic solutions at pH < 1, polymers dissociate into cationic species, HMoO 3 + , and H 3 MoO + 4 , which are considered to be dominant (24,25).…”

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

“…The chemistry of molybdenum(VI) in aqueous solutions has been an area of intense activity since the late 1950s (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27). Because of the existence of anionic, cationic, and polymeric species, the behavior of molybdenum in the extraction experiments is complicated to understand.…”

Section: Introductionmentioning

confidence: 99%

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EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Fujii

Yamana

Watanabe³

et al. 2001

Solvent Extraction and Ion Exchange

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The extraction behavior of molybdenum(VI) under the conditions of transuranium extraction (TRUEX) process was studied by using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide. The extraction behavior of molybdenum(VI) under the condition of PUREX process was also investigated for comparison. The extraction of molybdenum with the copresence of uranium(VI), dysprosium(III), and the effect of oxalic acid were examined. Under the PUREX conditions, molybdenum was less extractable, while under the TRUEX process conditions, a higher distribution ratio of molybdenum was observed. Under the TRUEX conditions, the addition of oxalic acid was effective in depressing molybdenum extraction. It was concluded that, at the concentration of nitric acid ORDER REPRINTS 128FUJII ET AL.around 1 mol dm −3 or higher, Mo(VI) is extracted predominantly as cationic species, while at lower concentration of nitric acid, the coextraction of anionic molybdenum as a mixed complex with other metal, that is, UO 2+ 2 , occurs.

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Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 80%

Section: Aquatic Chemistry Of Molybdenum(vi)mentioning

confidence: 99%

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EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Fujii

Yamana

Watanabe³

et al. 2001

Solvent Extraction and Ion Exchange

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“…In recent years, a statistical method, called factor analysis, has been introduced into the field of analytical chemistry and applied to the separation of the overlapped spectra to get each spectra based on the individual species ions (11)(12). Some isopolymolybdate ions have been also found in the acidic solutions (13)(14)(15)(16)(17)(18)(19)(20)(21). These isopolymolybdate ions are in equilibrium in the solutions and give overlapped spectra.…”

mentioning

confidence: 99%

“…The FIA methods proposed so far for the determination of this analyte in different samples and with different types of detection (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) show the potential of FIA for analysis of S02. The interferents in the determination of this analyte in wines are eliminated by using a gas-diffusion cell (15,22) or the stopped-flow technique (21).…”

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confidence: 99%

Studies of Raman spectra and equilibria of isopolymolybdate ions in aqueous acidic solutions by factor analysis

Ozeki¹,

Kihara²,

Hikime³

1987

Anal. Chem.

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Anal. Chem. 1907. 59. 945-950 945 of systematic error associated with interferences either in the determination of metals in one or more of the fractions or in the sequential extraction procedure itself.Precision was assessed by performing sequential microwave extractions on replicate (n = 31) sediment samples from California Gulch, CO (5CA). These samples were extracted in seven separate batches of four to six replicates by three technicians who had little or no experience working with this system. Data from these experiments are presented in Table I11 for major elements of Ca and Fe and minor elements Mn, Pb, and Zn. Excluding the exchangeable fraction, the average percent relative standard deviation (% RSD) for any particular fraction was about 11 % . The average % RSD for total metals as determined from the sum of the metals in each of the fractions was about 5%. In the exchangeable fraction Fe and P b average below the detectable limit for the determination of those metals by flame AAS, while the other three elements have rather large %RSD's ranging from 60% to 100%. This large variation is due in part to the fact that concentrations of metals in the exchangeable fraction are frequently being measured near the detectable limit for this procedure. This work shows that microwave heating techniques can be valuable in the study of the speciation of metals within binding fractions of sediments. Use of the microwave technique reduces the time required for fractionation from about 24 h to about 4 h, while at the same time producing results that are comparable to the conventional procedure. Recovery of iron from the residual fraction is virtually complete if the aqua regia/HF digestion is used rather than HNO,/HCl alone. The procedure appears to give the best results for minor and trace elements since the extraction rate experiments suggest that the efficiency of separation of these elements from one fraction to another is much greater than for major matrix elements. This paper reports results obtained from metal determinations made by flame AAS using direct calibration after correction of the absorbance for the signal from an appropriate reagent blank. Other than the correction for reagent blank, no special effort was made to identify and compensate for interferences. Accuracy and precision could possibly be improved by using the method of standard additions. ACKNOWLEDGMENTThe authors thank the following undergraduate students at USC who also contributed to this work Cheryl Passarelli, Weliershaus, S.; Forstner, U. Environ. Techno/. Lett. 1982, 3, 199. Farmer, John G.; Gibson, M. J.; Loveli, M. A. Miner. Environ. 1983, 5 , 57. Brannon, J. M.; Engler, R. M.; Rose, J. M.; Hunt, P. G.; Smith, I., U.S.

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Molybdenum species in acid solution

Jenkins¹,

Wain²

1963

J. Biochem. Toxicol.

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The state of molybdenum (VI) in perchloric acid solutions

Cited by 20 publications

References 4 publications

EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

EXTRACTION OF MOLYBDENUM FROM NITRIC ACID BY OCTYL(PHENYL)-N,N-DIISOBUTYLCARBAMOYLMETHYL-PHOSPHINE OXIDE

Studies of Raman spectra and equilibria of isopolymolybdate ions in aqueous acidic solutions by factor analysis

Molybdenum species in acid solution

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