Metal-Gluconate Complexes

Sawyer, Donald T.

doi:10.1021/cr60232a003

Cited by 181 publications

(98 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Multiple titrations were conducted with initial solutions of different UO 2 (ClO 4 ) 2 and HClO 4 concentrations. The complexation constants of uranyl/gluconate on the molarity scale were calculated with the program Hyperquad.…”

Section: Potentiometrymentioning

confidence: 99%

“…The measured value, -47.7 ± 0.3 kJ·mol -1 at 25 o C, compared well with those in the literature. 19,22 Multiple titrations were conducted with different concentrations of UO 2 (ClO 4 ) 2 and HClO 4 at 25 °C. For each titration run, n experimental values of the total heat produced in the reaction vessel (Q ex,j , j = 1 -n) were calculated as a function of the mass of the added titrant.…”

Section: Calorimetrymentioning

confidence: 99%

“…Gluconate was added in large quantities to the nuclear materials processed at Hanford to facilitate dissolution of iron and aluminum [1][2][3][4][5][6][7][8][9] , and consequently, it directly affects f-element speciation in HLW. [10][11][12][13] This complicates waste processing for vitrification.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis

et al. 2009

View full text Add to dashboard Cite

show abstract

Section: Potentiometrymentioning

confidence: 99%

Section: Calorimetrymentioning

confidence: 99%

See 1 more Smart Citation

Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Gluconic acid refers to D-gluconic acid derived from natural D-glucose. To be consistent with the notations in the literature, gluconate, gluconic acid, and δ/γ-lactone, as shown in Scheme I, are denoted by GH 4 -, HGH 4 and δ/γ-L, respectively, where the first H of HGH 4 refers to the proton on the carboxylate group and H 4 refers to four hydrogens on the secondary alcohols (3,12) . The six carbon atoms are numbered from the top in order as C1 to C6.…”

mentioning

confidence: 99%

“…(1,2) Many studies deal with solutions of high pH because gluconate forms strong complexes with metal cations in neutral to basic solutions. (3)(4)(5)(6)(7) Fewer studies have been conducted in solutions of low pH, and thermodynamic data that describe solution behavior under acidic conditions are scarce and in disagreement. Two reasons likely contribute to this situation: 1) Under acidic conditions, the ability of gluconic acid to bind metal ions is weak or moderate, (8,9) making the studies less attractive for applications; 2) the studies at low pH are complicated by lactonization of gluconic acid, (10,11) a slow reaction that is coupled to fast chemical processes such as protonation/deprotonation and complexation.…”

mentioning

confidence: 99%

Lactonization and Protonation of Gluconic Acid: A Thermodynamic and Kinetic Study by Potentiometry, NMR and ESI-MS

et al. 2007

View full text Add to dashboard Cite

In acidic aqueous solutions, gluconate protonation is coupled with lactonization of gluconic acid. With the decrease of pC H , two lactones (δ/γ) are sequentially formed. The δ-lactone forms more readily than the γ-lactone. In 0.1 M gluconate solutions, if pC H is above 2.5, only the δ-lactone is generated. When pC H is decreased below 2.0, the formation of the γ-lactone is observable although the δ-lactone predominates. At I = 0.1 M NaClO 4 and room temperature, the deprotonation constant of the carboxylic group, using the NMR technique, was determined to be log K a = 3.30 ± 0.02; the δ-lactonization constant, by the batch potentiometric titrations, was obtained to be log K L = -(0.54 ± 0.04). Using ESI-MS, the rate constants of the δ-lactonization and the hydrolysis at pC H ~ 5.0 were estimated to be k 1 = 3.2 x 10 -5 s -1 and k -1 = 1.1 x 10 -4 s -1 , respectively.

show abstract

Chelating Agents

Howard¹,

Wilson²

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Chelating agents or chelants are compounds having two or more donor atoms that can form cyclic coordination complexes or chelates with acceptor metals. The complexation is an equilibrium reaction which often strongly favors the complex. Chelating is used to modify or control the behavior of metals and their compounds by controlling the concentration of the metals in solution or to utilize the special properties of the chelation compounds. The active groups in chelants may be linear chains, eg, ‐N‐C‐C‐N‐, macrocyclic rings, eg [‐O‐C‐C] n , or polycyclic structures, such as the cryptates, eg, X[‐C‐C‐Y‐C‐C) n ] 3 Y where X and Y are bridgehead and donor atoms, respectively. Some pH, stability, solubility, and electrochemical relationships among simultaneous equilibria in chelation are shown. A broad range of applications based on concentration control, the special properties, and medical uses of chelation compounds are given. Metal sequestration, solubilization, and buffering are discussed as are metal extraction, precipitation, and displacement. Economic data for industrial chelating agents are given. Use of chelating agents is essentially benign environmentally and presents little or no hazard to health or safety under normal conditions of use and handling.

show abstract

Metal-Gluconate Complexes

Cited by 181 publications

References 32 publications

Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis

Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis

Lactonization and Protonation of Gluconic Acid: A Thermodynamic and Kinetic Study by Potentiometry, NMR and ESI-MS

Chelating Agents

Contact Info

Product

Resources

About