Mechanisms goethite-water

Hayes and Leckie (1986) postulate on the basis of their pressure jump relaxation experiments on the adsorption-desorption of Pb2+ at the goethite-water interface the following mechanism ... [Pg.127]

Spectroscopic techniques may provide the least ambiguous methods for verification of actual sorption mechanisms. Zeltner et al. (Chapter 8) have applied FTIR (Fourier Transform Infrared) spectroscopy and microcalorimetric titrations in a study of the adsorption of salicylic acid by goethite these techniques provide new information on the structure of organic acid complexes formed at the goethite-water interface. Ambe et al. (Chapter 19) present the results of an emission Mossbauer spectroscopic study of sorbed Co(II) and Sb(V). Although Mossbauer spectroscopy can only be used for a few chemical elements, the technique provides detailed information about the molecular bonding of sorbed species and may be used to differentiate between adsorption and surface precipitation. [Pg.7]

Mechanism of Lead Ion Adsorption at the Goethite-Water Interface... [Pg.114]

Based on the pressure-jump relaxation results reported here, the following mechanism is postulated for the adsorption/desorption of Pb2+ ion at the goethite/water interface (8) ... [Pg.114]

Hayes, K.F. Leckie, J.O. (1986) Mechanisms of lead adsorption at the goethite-water interface. In Davis, J.A. Hayes, K.F. (eds.) Geochemical processes at mineral surfaces. ACS Symp. Ser. 323, Am. Chem. Soc. Washington D.C., 114-141... [Pg.588]

Zhang, P.C. Sparks, D.L. (1989) Kinetics and mechanism of molybdate adsorption/desorp-tion at the goethite/water interface using pressure-jump relaxation. Soil Sci. Soc. Am. [Pg.646]

Zhang, P.C. Sparks, D.L. (1990) Kinetics and mechanism of sulfate adsorption and desorption on goethite using pressure jump relaxation. Soil Sci. Soc. Am. J. 54 1266-1273 Zhang, P.C. Sparks, D.L. (1990) Kinetics of selenate and selenite adsorption/desorption at the goethite/water interface. Environ. Sci. Technol. 24 1848-1856... [Pg.646]

Hayes and Leckie (1986) investigated Pb adsorption/desorption at the goethite/water interface using p-jump relaxation. A modified TLM was developed to obtain parameters for surface charge and potential. Three types of information were required to verify the reaction mechanism (i) overall... [Pg.86]

Hayes, K. F., and J. O. Leckie (1986), Mechanism of Lead Ion Adsorption at the Goethite-Water Interface, in J. A. Davis and K. F. Hayes, Eds., Geochemical Processes at Mineral Surfaces, American Chemical Society, Washington, pp. 114-141. [Pg.398]

Elzinga E, Peak D, Sparks DL (2001) Spectroscopic studies of Pb(II)-sulfate interactions at the goethite-water interface. Geochim Cosmochim Acta 65 2219-2230 Elzinga E, Sparks DL (1999) Nickel sorption mechanisms in a pyrophyllite-montmorillonite mixture. J Colloid Interface Sci 213 506-512... [Pg.79]

Arai, Y. (2010) X-ray spectroscopic investigation of molybdenum multinudear sorption mechanism at the goethite-water interface. Environ. Sci. Technol., 44, 8491-8496. [Pg.347]

A number of observations help to understand the mechanism of hematite formation from ferrihydrite in aqueous systems i. e. under conditions essentially different from those for solid-state transformation by dry heating (see 14.2.6). Air-dry storage of ferrihydrite containing 100-150g H20/kg of water (found by weight loss) at room temperature for 20.4 years in closed vessels led to partial transformation to fairly well crystalline hematite with a little goethite (Schwertmann et al., 1999). In contrast, no hematite was formed from ferrihydrite if the content of adsorbed water was substantially reduced (Stanjek and Weidler, 1992 Weidler, 1997) as seen from the following examples ... [Pg.391]

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