A Spectrophotometric Study of the Hydrolysis of Iron(III) Ion. III. Heats and Entropies of Hydrolysis

Milburn, Ronald M.

doi:10.1021/ja01560a011

Cited by 122 publications

(35 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HzS(aq) = H++HS- [1] [43] [43] computed [43] [ 43] x) For most of the reactions listed, different authors have determined equilibrium constants, which differ slightly among each other. Other values may be found in [8].…”

Section: Fe( I I) Solubilitymentioning

confidence: 99%

The chemistry of aqueous iron

Stumm

Lee

1960

Schweiz. Z. Hydrologie

View full text Add to dashboard Cite

Iron compounds are generously distributed in nature. They play an important role in water supplies, waste waters and in limnology. Water supply personnel are frequently confronted with problems, such as rusty water, corrosion, deferrization, coagulation, iron bacteria etc., where an adequate understanding of the chemistry of aqueous iron is relevant. The complexity of the aqueous iron system frequently is not fully appreciated. Many of the anomalous properties of iron compounds which are described in the literature can be explained by considering, besides the solubility equilibria of Fe(OH)~ and Fe(OH)a , the many other possible equilibria : solubility, complex formation, redox and 'hydrolysis', that may exist in iron bearing waters. In addition, the kinetics of each of these equilibrium reactions must also be considered.Q.u.ite obviously, this discussion of the chemistry of aqueous iron cannot be all inclusive. The authors have concentrated only on those theoretical aspects which in their opinion appear to be relevant in the iron chemistry of natural waters. Furthermore, no attempt has been made to completely cover the literature on this subject. The Solubility of Ferrous and Ferric IronIron may exist in solution in either the divalent, ferrous, or the trivalent, ferric state. In oxygenated water ferrous iron is oxidized to the ferric iron. The rate of this oxidation has been shown to be primarily dependent upon the hydrogen ion concentration and the temperature of the solution. The amount of iron taken into, or retained in solution, is frequently greater for ferrous than for ferric iron ; in other words, ferrous constituents tend to display a geater solubility than do ferric constituents.

show abstract

Section: Fe( I I) Solubilitymentioning

confidence: 99%

The chemistry of aqueous iron

Stumm

Lee

1960

Schweiz. Z. Hydrologie

View full text Add to dashboard Cite

show abstract

“…Figure 10. pH vs. other measured and calculated chemical parameters for the12 New Jersey well waters Downloaded by UNIV OF CALIFORNIA SAN DIEGO on November 17, 2014 | http://pubs.acs.org Publication Date: June 1, 1971 | doi: 10.1021/ba-1971-0106.ch008 In Nonequilibrium Systems in Natural Water Chemistry; Hem, J.; Advances in Chemistry; American Chemical Society: Washington, DC, 1971.iron concentrations of about 10 ppm. Thus, as in the laboratory, the relatively stable oxyhydroxides develop in the presence of high Fe 2+ concentrations, under which conditions fresh precipitates can recrystallize to more stable forms.…”

mentioning

confidence: 99%

Variations in the Stability of Precipitated Ferric Oxyhydroxides

Langmuir

Whittemore

1971

Advances in Chemistry

112

View full text Add to dashboard Cite

“…Figure 3 suggests that binding of glutathione to Fe(II1) is only weakly p H dependent. This p H dependence is not easily understood because of the complex acid-base behaviour of both GSH and Fe(II1) (4,5). In the p H range from 1 to 3, GSH2+, GSH, Fe(OH-J3', and Fe(OH& OH2-are major species and GS-is not entirely negligible.…”

Section: (6) Bincling Eqzrilibri~rm and Natural Watermentioning

confidence: 99%

Kinetic and spectrophotometric studies of binding of iron(III) by glutathione

Khan¹,

Langford²

1976

Can. J. Chem.

View full text Add to dashboard Cite

. Can. 9. Chem. 54, 3192 (1976).In this report, determination of unbound aquo iron species is accomplished by a kirretic n~et/7oc/involving reaction with sulfosalicylic acid (SSA) on a time ssale which is very short with respect to reaction of SSA with the glutathione complexes of iron. The data are used to calculate conditional binding constants for Fe(lI1) to glutathione. Binding constants in 0.1 M ionic strength media were obtained between p H 1 and 2.4 by the kinetic method. and near p H = 3 by spectrophotometry arrd by examillation of the ratio of rate of complex formation and dissociation. The conditional binding 'constant' betweetz p H 1 and 3 is represented as pK = -1.96 -O.5OpH. This is consistent with the importance of reactions involving only very limited proton release. Spectrophotometric data show that the -OH group on Fe(OH)*-is lost on glutathione complexing. Kinetics of the complex formation reaction between aquo iron(I1I) species and glutathione are slower than rates of reaction of iron (111) with simple ligands.The glutathione system is regarded as a model system important to natural water chemistry because it is a widely distributed biological sulfur-containing chelating agent. Des donnkes spectrophotomCtriques demontrent que le groupe OH du Fe(OH)2+ est perdu lors de la complexation avec du glutathion. La cinktique de la reaction de formation du complexe entre les espkces aquo-ferriques et le glutathion sont plus faibles que les vitesses de rkaction du fer(II1) avec des ligands simples.On considkre que le systkme de glutathion est un systkme n~odkle important pour la chinlie de l'eau naturelle parce que c'est un agent biologique chelata~~t contenant du soufre qui est distribui trks largement.[Traduit par le journal]

show abstract

A Spectrophotometric Study of the Hydrolysis of Iron(III) Ion. III. Heats and Entropies of Hydrolysis

Cited by 122 publications

References 7 publications

The chemistry of aqueous iron

The chemistry of aqueous iron

Variations in the Stability of Precipitated Ferric Oxyhydroxides

Kinetic and spectrophotometric studies of binding of iron(III) by glutathione

Contact Info

Product

Resources

About