ChemInform Abstract: PREDICTION OF STABILITY CONSTANTS. I. PROTONATION CONSTANTS OF CARBOXYLATES AND FORMATION CONSTANTS OF THEIR COMPLEXES WITH CLASS A METAL IONS

Smith, Robert M.; Martell, Arthur E.; Motekaitis, Ramunas J.

doi:10.1002/chin.198535056

Cited by 82 publications

(145 citation statements)

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“…An analogue of ED3A, N-methylethylenedinitrilotriacetic acid, is known, 40,41 although binding constants with Pb(ii) and Ag(i) have not been reported. 42 The response of the QCM in the region represented by A-B (Fig. 1) was dependent on (i) the presence of the ED3A-silica and (ii) the concentration of lead(ii) in the solution.…”

Section: Resultsmentioning

confidence: 99%

Detection of lead(II) and silver(I) in aqueous solution using a piezoelectric device

Cox¹,

Hill²,

Gahan³

1999

Analyst

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The gold surface of a quartz crystal microbalance was modified by the attachment of silica particles derivatised with N- [(3-trimethoxysilyl)propyl]ethylenediaminetriacetic acid. The device was employed to study the kinetics of the interaction of aqueous solutions of lead(ii) nitrate and silver(i) nitrate with the surface and for the selective separation of the metal ions.The quartz crystal microbalance (QCM) consists of a thin, circular, quartz crystal with circular gold electrodes placed centrosymmetrically on opposite faces. 1-5 Application of an electric field across the crystal, using an electronic oscillator, results in vibration of the crystal at its resonant frequency. The frequency of the oscillating crystal is decreased by deposition of mass on its surface and it has been shown that in the gas phase the change in frequency for a quartz crystal is related to change in mass by the Sauerbrey equation. 6 These devices are radially sensitive, i.e., it is the area under the gold electrode surface which is the most sensitive part, and the quartz surface projecting radially from the centre becomes less sensitive to mass deposited. 7 The mass sensitivity of the QCM has been exploited in both the vapour phase and in liquids, and there are numerous reported applications. [1][2][3][4][5][8][9][10][11][12][13][14][15][16] Two areas of the application of QCM devices are of immediate interest. The first involves the monitoring of biomolecular reactions in the liquid phase, in particular kinetic immunoassays which can be followed by the change in frequency as the mass on the surface of the crystal increases. 17 The piezoelectric device offers an alternative to the measurement of reaction kinetics of heterogeneous systems involving biomacromolecular interactions using the BIAcore TM instrument, although in the latter case the kinetic analyses have been more extensively investigated and developed. 18-20 Second, we are interested in the development of piezoelectric devices for the detection and determination of metal ions in solution, 14,[21][22][23][24][25][26][27] where sorbents chemically attached to the crystal are employed in order to obtain the selectivity required to determine one metal ion in the presence of others.We describe an application of the QCM which combines the two areas. The QCM device described in this work is not employed specifically as a mass sensor, in line with recent studies which question this aspect of their use, 28,29 but more so as an event sensor. A QCM device, derivatised with an aminopolycarboxylate ligand covalently attached to spherical silica particles, is employed in the search for selective substrates and/or conditions under which it would be possible to separate metal ions under flow conditions. A combination of the determination of an adsorption isotherm and investigation of association and dissociation phase kinetic parameters has been employed to permit the prediction of the behaviour of two metal ions on the derivatised silica substrate.

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Section: Resultsmentioning

confidence: 99%

Detection of lead(II) and silver(I) in aqueous solution using a piezoelectric device

Cox¹,

Hill²,

Gahan³

1999

Analyst

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“…Krupka and Serne (2002) searched the stability constant database of Smith et al (1997) to determine if data existed to calculate the thermodynamic distribution of Tc aqueous species containing any of these complexing ligands. The database by Smith et al (1997) contains the Tc(VII) and Tc(IV) oxidation states, and does not list any stability constants for Tc(VII) and Tc(IV) aqueous complexes with EDTA, HEDTA, NTA, citrate, hydroacetic acid (or glycolate), TBP, or cyanide. It is important to keep in mind that the lack of thermodynamic data for such complexes in an extensive, well-accepted database, such as by Smith et al (1997), 4 does not mean that such complexes are not important.…”

Section: 22mentioning

confidence: 99%

“…The database by Smith et al (1997) contains the Tc(VII) and Tc(IV) oxidation states, and does not list any stability constants for Tc(VII) and Tc(IV) aqueous complexes with EDTA, HEDTA, NTA, citrate, hydroacetic acid (or glycolate), TBP, or cyanide. It is important to keep in mind that the lack of thermodynamic data for such complexes in an extensive, well-accepted database, such as by Smith et al (1997), 4 does not mean that such complexes are not important. The lack of tabulated thermodynamic constants may simply indicate that the formation of such complexes has not been studied from the perspective of determining their thermodynamic constants and/or that data available for such complexes are suspect and require additional study and independent determination.…”

Section: 22mentioning

confidence: 99%

Advances in Geochemical Testing of Key Contaminants in Residual Hanford Tank Waste

Deutsch¹,

Krupka²,

Cantrell³

et al. 2005

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This document was printed on recycled paper.The cover shows a scanning electron microscope image of aluminum (red) and iron (green) in a particle aggregate of residual waste from tank C-106 at the C Tank Farm on the Hanford Site. Cover design by S. B. Neely, Pacific Northwest National Laboratory. SummaryThis report describes the advances that have been made over the past two years in testing and characterizing waste material in Hanford tanks. This waste is being studied because it will remain in the tanks after closure and represents a potential source of contamination to the environment. The development of a contaminant release model for the residual waste in a tank requires detailed knowledge of the composition of the waste and the phases (liquid and solids) in the waste that contain the contaminant. The contaminant release models developed for the tanks will be used as a component in the performance assessments for tank closures being conducted by CH2M HILL Hanford Group Inc. for the U.S. Department of Energy.

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“…To calculate the SI, K sp values from database (modified minteq.v4) was used to compare the IAP which calculated by the program. In addition to this database, reactions (9) to (11) 22) were considered. 4 , and AlPO 4 were smaller than zero, as shown in Table 4; therefore, the dissolved Ca, Mn, and Al did not affect the solubility of P in aqueous solution.…”

Section: )mentioning

confidence: 99%

Extraction of Phosphorus from Steelmaking Slag by Selective Leaching Using Citric Acid

Iwama

Gao

et al. 2018

ISIJ Int.

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An approach to leach phosphorus from slag was applied to commercial fertilizers made from steelmaking slag, which has relatively coarse grains. After leaching at pH 3 with citric acid, about 60% of the P 2 O 5 had been dissolved, but the dissolution ratio of MnO was less than 30%. The separation index, calculated from the dissolution ratio of P 2 O 5 divided by that of MnO, was 2.1. In addition, the dissolution ratio of the solid solution was 90% or greater. However, 25% or more of the matrix was also dissolved. To improve the selectivity of leaching, the mineralogical phases comprising the matrix were synthesized, and their leaching behaviors were investigated. The results indicate that it is important to eliminate the glassy phases and to change the valence state of iron in its oxides to 3 + to suppress the dissolution of the matrix. Finally, a synthesized slag, containing only Fe 2 O 3 as the only iron oxide, was prepared by slow cooling, and leaching tests were conducted. About 99% of the P was dissolved, but the dissolution ratio of Mn was less than 10%. In addition, the separation index increased to 14.1. In this case, the dissolution of the matrix was suppressed, and almost all the solid solution phase was dissolved.

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ChemInform Abstract: PREDICTION OF STABILITY CONSTANTS. I. PROTONATION CONSTANTS OF CARBOXYLATES AND FORMATION CONSTANTS OF THEIR COMPLEXES WITH CLASS A METAL IONS

Cited by 82 publications

References 1 publication

Detection of lead(II) and silver(I) in aqueous solution using a piezoelectric device

Detection of lead(II) and silver(I) in aqueous solution using a piezoelectric device

Advances in Geochemical Testing of Key Contaminants in Residual Hanford Tank Waste

Extraction of Phosphorus from Steelmaking Slag by Selective Leaching Using Citric Acid

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