Adsorption of natural dissolved organic matter at the oxide/water interface

Abstract Natural organic matter is readily adsorbed by alumina and kaolinite in the pH range of natural waters. Adsorption occurs by complex formation between surface hydroxyls and the acidic functional groups of the organic matter. Oxides with relatively acidic surface hydroxyls, e.g. silica, do not react strongly with the organic matter. Under conditions typical for natural waters, almost complete surface coverage by adsorbed organic matter may be expected for alumina, hydrous iron oxides and the edge sites of aluminosilicates. Potentiometric titration and electrophoresis indicate that most of the acidic functional groups of the adsorbed organic matter are neutralized by protons from solution. The organic coating is expected to have a great influence on subsequent adsorption of inorganic cations and anions.

[1]  W. Stumm,et al.  The surface complexation of organic acids on hydrous γ-Al2O3 , 1980 .

[2]  K. A. Hunter,et al.  The surface charge of suspended particles in estuarine and coastal waters , 1979, Nature.

[3]  A. R. Fraser,et al.  Adsorption on hydrous oxides.III.Fulvic acid and humic acid on goethite,gibbsite and imogolite , 1977 .

[4]  N. C. Mehta,et al.  Chemical investigations on soil humic substances , 1964 .

[5]  J. Hem,et al.  Effects of organic solutes on chemical reactions of aluminum. Chemistry of aluminum in natural water , 1975 .

[6]  J. Reuter,et al.  The operational nature of acidic functional group analyses and its impact on mathematical descriptions of acid-base equilibria in humic substances , 1980 .

[7]  J. Quirk,et al.  ADSORPTION OF THE HERBICIDE 2,4‐D ON GOETHITE , 1973 .

[8]  L. Balistrieri,et al.  Scavenging residence times of trace metals and surface chemistry of sinking particles in the deep ocean , 1981 .

[9]  J. A. Davis,et al.  Adsorption of dissolved organics in lake water by aluminum oxide. Effect of molecular weight. , 1981, Environmental science & technology.

[10]  A. R. Fraser,et al.  ADSORPTION ON HYDROUS OXIDES: II. OXALATE, BENZOATE AND PHOSPHATE ON GIBBSITE , 1977 .

[11]  Shahamat U. Khan,et al.  Humic substances in the environment , 1972 .

[12]  G. A. Parks,et al.  Characterization of Aqueous Colloids by Their Electrical Double-Layer and Intrinsic Surface Chemical Properties , 1982 .

[13]  R. Neihof,et al.  THE SURFACE CHARGE OF PARTICULATE MATTER IN SEAWATER , 1972 .

[14]  J. P. Riley,et al.  The complexation of metals with humic materials in natural waters , 1978 .

[15]  E. Tipping,et al.  Iron oxide from a seasonally anoxic lake , 1981 .

[16]  E. Tipping,et al.  The effects of adsorbed humic substances on the surface charge of goethite (α-FeOOH) in freshwaters , 1982 .

[17]  James A. Davis,et al.  Surface ionization and complexation at the oxide/water interface. 3. Adsorption of anions , 1980 .

[18]  A. Nissenbaum,et al.  Organic matter-metal interactions in Recent sediments: the role of humic substances , 1976 .

[19]  M. Anderson,et al.  The adsorption of protolyzable anions on hydrous oxides at the isoelectric pH , 1979 .

[20]  M. Schnitzer,et al.  Determination of Acidity in Soil Organic Matter , 1965 .

[21]  E. Sholkovitz,et al.  The chemistry of suspended matter in Esthwaite Water, a biologically productive lake with seasonally anoxic hypolimnion , 1982 .

[22]  Thomas W. Healy,et al.  Mechanism of anion adsorption at the ferric and chromic oxide/water interfaces , 1975 .

[23]  J. Leckie,et al.  Surface ionization and complexation at the oxide/water interface , 1978 .

[24]  E. Tipping,et al.  The adsorption of aquatic humic substances by iron oxides , 1981 .

[25]  E. Boyle,et al.  The mechanism of iron removal in estuaries , 1977 .

[26]  Egon Matijević,et al.  Surface and Colloid Science , 1971 .

[27]  W. Stumm,et al.  The specific surface area of γ-Al2O3 , 1972 .

[28]  K. Hunter.  Microelectrophoretic properties of natural surface-active organic matter in coastal seawater , 1980 .

[29]  J. Leckie,et al.  Effect of adsorbed complexing ligands on trace metal uptake by hydrous oxides , 1978 .

[30]  Werner Stumm,et al.  Specific adsorption of cations on hydrous γ-Al2O3 , 1973 .

[31]  E. Sholkovitz,et al.  Flocculation of dissolved organic and inorganic matter during the mixing of river water and seawater , 1976 .

[32]  E. Matijević,et al.  Interactions of metal hydrous oxides with chelating agents. I. β-FeOOH—EDTA , 1979 .

[33]  J. Quirk,et al.  Describing the adsorption of phosphate, citrate and selenite on a variable-charge mineral surface , 1980 .