Spectroscopic studies of aqueous gallium(III) and aluminum(III) citrate complexes

Clausén, Maria; Öhman, Lars‐Olof; Persson, Per

doi:10.1016/j.jinorgbio.2004.12.007

Cited by 40 publications

(26 citation statements)

References 19 publications

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“…Previous work has suggested that the coordination chemistries of Ga(III) and Al(III) with citrate are very similar (Clauson et al, 2005). The Ga-citrate speciation plots reported here assume that a 1:1 complex between the metal and ligand dominates.…”

Section: Resultssupporting

confidence: 47%

“…However, oligomeric aluminium citrate (1:1) complexes (20 mM) have recently been identifi ed. In the current work where the molar ratio was greater than 1:1 (Ga : citrate), in principle an oligomeric 1:1 species (Ga 3 Cit 3 ) could coexist with the mononuclear 1:2 species (Clauson et al, 2005;Clevette and Orvig, 1990). Despite this possibility it was assumed that the oligomeric 1:1 and the mononuclear species 1:2 species were not present to any signifi cant degree in the solutions assessed in the current work as the Ga(III) concentration was 5-fold lower than in the previous studies when these multiple Al(III)-citrate species were identifi ed.…”

Section: Resultsmentioning

confidence: 81%

“…However, incomplete ligand binding can lead to reduced stability as a result of an increase in susceptibility to nucleophilic attack. The hydroxide, citrate and EDTA Ga complexes all exhibit an octahedral spatial arrangement (Clauson et al, 2005). The EDTA-Ga complex has the greatest affi nity to the metal due to the N 2 O 2 donor group occupying equatorial positions, allowing it to bind in its simplest form.…”

Section: Ga(iii) Recovery From Coordination Complexesmentioning

confidence: 99%

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Recovering Ga(III) from coordination complexes using pyridine 2,6‐dicarboxylic acid chelation ion chromatography

Staff

Brown

Hider

et al. 2010

Biomedical Chromatography

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Ion exchange chelation chromatography is an effective means to extract metals from coordination complexes and biological samples; however there is a lack of data to verify the nature of metal complexes that can be successfully analysed using such a procedure. The aim of this study was to assess the capability of pyridine 2,6-dicarboxylic acid (PDCA) to extract and quantify Ga(III) from a range of environments using standard liquid chromatography apparatus. The PDCA chelation method generated a single Ga(III) peak with a retention time of 2.55 +/- 0.02 min, a precision of <2% and a limit of detection of 110 microM. Ga(III) hydroxide complexes (highest stability constant 15.66) were used to successfully cross-validate the chelation method with inductively coupled plasma mass spectrometry. The PDCA assay extracted 96.9 +/- 1.2% of the spiked Ga(III) from porcine mucus and 100.7 +/- 2.7% from a citrate complex (stability constant 10.02), but only ca 50% from an EDTA complex (stability constant 22.01). These data suggest that PDCA chelation can be considered a suitable alternative to inductively coupled plasma mass spectrometry for Ga(III) quantification from all but the most strongly bound coordinated complexes i.e. a stability constant of <15.

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Section: Resultssupporting

confidence: 47%

Section: Resultsmentioning

confidence: 81%

Section: Ga(iii) Recovery From Coordination Complexesmentioning

confidence: 99%

See 1 more Smart Citation

Recovering Ga(III) from coordination complexes using pyridine 2,6‐dicarboxylic acid chelation ion chromatography

Staff

Brown

Hider

et al. 2010

Biomedical Chromatography

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“…The inorganic ionic forms are more reactive and more toxic with respect to the fauna and flora. In humans, abnormally high aluminum levels have been linked to important pathologies [3]. Therefore, metal removal from sludge is a desirable pre-treatment prior to its use as a fertilizer or soil conditioner.…”

Section: Résumémentioning

confidence: 99%

Effect of sludge pH and treatment time on the electrokinetic removal of aluminum from water potabilization treatment sludge

Cherifi

Boutemine²,

Laefer

et al. 2016

Comptes Rendus. Chimie

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Algerian's municipal sewage treatment plants generate around 10 6 m 3 of sewage sludge annually. Recently, rapid expansion of waste water treatment plants without equal attention to the treatment of the produced sludge has generated increasing concerns. While the sludge is usually incinerated or used as an agricultural fertilizer and may contain numerous nutrients, there may also be harmful substances that complicate sludge management. Hence the removal of pollutants from the sludge is necessary before further usage. This paper discusses the characteristics of potable water treatment sludge containing a high aluminum content. Furthermore, an electrokinetic treatment is proposed to remove aluminum from this sludge by varying the type of solution contained in the cathode compartment and modifying the treatment time to optimize the efficiency of the process. Successful results were achieved where 60% of aluminum was collected on the cathode side with a consumed energy around of 1000-2000 kWh kg −1 of sludge weight. RésuméLes stations de traitement d'eaux résiduaires en Algérie génèrent annuellement environ 10 6 m 3 de boues d'épuration. Récemment, on a pu observer une préoccupation croissante quant à la gestion de ces boues d'épuration, en raison des risques pour l'environnement qui ont résulté de l'expansion rapide des stations de traitement des eaux résiduaires, sans qu'on ait apporté une attention égale au traitement des boues produites, qui sont habituellement incinérées ou utilisées comme fertilisants en agriculture. Les boues peuvent contenir un certain nombre de nutriments, mais aussi une infinité de substances nocives qui compliquent la tâche au niveau de la gestion des boues. C'est pourquoi l'élimination de polluants des boues est nécessaire préalablement à leur utilisation. Ce travail expose la caractérisation d'une boue de traitement d'eau potable contenant une grande quantité d'aluminium. En outre, un traitement électrocinétique permettant d'éliminer l'aluminium de cette boue en faisant varier le type de la solution qui conditionne la cathode ainsi que le temps de traitement a été également discuté afin d'optimiser le processus électrocinétique. Des résultats encourageants sont obtenus quant à l'utilisation de cette technique ; jusqu'à 60% de l'aluminium présent initialement dans la boue a été recueilli dans la cathode, pour une énergie consommée d'environ 1000 à 2000 kWh kg −1 de boue sèche.

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“…[7][8][9] In physiological conditions the behavior of the system Ga(III)-citrate has been subject to debate and there is no consensus regarding the composition and the structure of the species formed. 10 Numerous studies and particularly potentiometric titration and 71 Ga NMR experiments 11,12 have revealed that aluminium and gallium have a similar hydrolytic behavior. Indeed, among metals, aluminium, gallium and iron exhibit a particular hydrolytic properties as they give rise to polycationic structures in a given pH/concentration conditions.…”

Section: Introductionmentioning

confidence: 99%

Gallium(III) Ion Hydrolysis under Physiological Conditions

2008

Bulletin of the Korean Chemical Society

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The hydrolysis of gallium(III) has been studied using potentiometric techniques under physiological conditions of temperature 37 °C and ionic strength 0.15 mol·dm −3 NaCl and at different metal ion concentrations. Changes in pH were monitored with a glass electrode calibrated daily in hydrogen ions concentrations. The titration data within the pH range of 2.5-9.99 were analyzed to determine stability constants of hydroxide species using the SUPERQUAD program. Several different species were considered during the calculation procedure and the following hydroxides have been characterized: Ga(OH)3, Ga(OH)4 − Ga3(OH)11 2− , Ga4(OH)11 + and Ga6(OH)15 3+. Speciation calculations based on the determined constants were then used to simulate the species distribution.

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Spectroscopic studies of aqueous gallium(III) and aluminum(III) citrate complexes

Cited by 40 publications

References 19 publications

Recovering Ga(III) from coordination complexes using pyridine 2,6‐dicarboxylic acid chelation ion chromatography

Recovering Ga(III) from coordination complexes using pyridine 2,6‐dicarboxylic acid chelation ion chromatography

Effect of sludge pH and treatment time on the electrokinetic removal of aluminum from water potabilization treatment sludge

Gallium(III) Ion Hydrolysis under Physiological Conditions

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