Interaction with Humic Acid

The influence of charge and molar mass on the flocculation mechanism was also confirmed by results obtained for water treatment, where the influence of humic acid on the flocculation of clay was investigated [26]. The separation of clay particles was influenced by the presence of humic compounds, which act like an additional PA in the clay dispersion. Owing to their adsorption on clay and the higher anionic charge 

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Morra, M. J., Corapcioglu, M. O., von Wandruszka, R. M. A., Marshall, D. B. Topper, K. (1990). Fluorescence quenching and polarization studies of naphthalene and 1-naphthol interaction with humic acid. Soil Science Society of America Journal, 54, 1283—9. 

Warwick, P., Inam, E. and Evans, N. (2005) Arsenic s interaction with humic acid. Environmental Chemistry, 2(2), 119-24. 

Strohal, P. and Huljev, D., 1970. Investigation of mercury pollutant interaction with humic acid by means of radio tracers. In Nuclear Techniques in Environmental Pollution. I.A.E.A., Vienna, pp. 439—446. 

Strohal, P., Huljev, D., "Mercury-Pollutant Interaction with Humic Acids by Means of Radiotracers, Nuc. Tech. Envir. Poll. Proc. Symp. 1970, IAEA, Vienna, Austria. 

FIGURE 5.22 Presence of cations such as Ca prevents soil enzymes inhibition by interacting with humic acids. 

Strohal P, Huljev D (1971) Investigation of mercury-pollutant interaction with humic acids by means of radiotracers. Proc Symp Nucl Techn Environ Poll, IAEA, Vienna, p 349 Watling RL (1981) The identification and significance of mercury compounds in estuarine sediments. Int Conf Heavy Metals in the Enviroment, CEP Consultants Ltd., Amsterdam, p 591... 

Shirzadi A, Simpson MJ, Xu Y, Simpson AJ (2008) Application of saturation transfer double difference NMR to elucidate the mechanistic interactions of pesticides with humic acids. Environ Sci Technol 42 1084—1090... 

Choppin, G. R. Clark, S. B. 1991. The kinetic interactions of metal ions with humic acids. Marine Chemistry, 36, 27-38. 

A series of complexes of 2,6-dihydroxybenzoate has been prepared and studied as model compounds for the interactions of metal ions with humic acids.65,183... 

Tombacz, E., Gilde, M., Abraham, I. and Szanto, F. (1988). Effect of electrolyte concentration on the interaction of humic acid and humate with montmorillonite, Appl. Clay Sci. 3, 31-52. 

Piccolo, A., Nardi, S., and Concheri, G. (1996a). Macromolecular changes of soil humic substances induced by interactions with organic acids. Eur. J. Soil Sci. 47, 319-328. 

Suteerapataranon, S., Bouby, M., Geckeis, H.,Fanghanel,T., and Gradpan, K. (2006). Interaction of trace elements in acid mine drainage solution with humic acid. Water Res. 40, 2044-2054. 

Saint-Fort, R. and S.A. Visser (1988). Study of the interactions between atrazine, diazinon and lindane with humic acids of various molecular weights. J. Environ. Sci. Health A, 23 613-624. 

Sullivan Jr. J.D. and G.T. Felbeck Jr. (1968). A study of the interaction of. v-triazine herbicides with humic acids from three different soils. Soil Sci., 106 42-52. 

Levashkevich, G.A., 1968. Interaction of humic acids with ionic forms of iron and aluminum. In Kora vyvetrivaniya (The Weathered Layer). Izd. Nauka, Moscow, 10 249-259 (in Russian). 

The first involves a known functional group derivatization to quantify specific types of carbons found in humic substances, the derivatization being carried out by chemical reactions with l C-labeled reactants.( d-27) For example, methylation with C-labeled diazomethane or methyl iodide has been used to distinguish between and quantify hydroxyl functionalities in humic acids. The second labeling methodology involves the use of C-labeled reactants to follow the course of a complex reaction or association such as the interaction of pollutants with humic acids.(6-9,22,2J) The first structural evidence for the type of interaction of pollutants with humic substances was provided using and site specific labeling in combination with and NMR, respectively. 

In the case of pentavalent cations, the conditional interaction constant (Table I) obtained for Np02" (log P = 4.6) shows a relatively low affinity of the neptunyl cation with the humic acids as it could be predicted from the charge of the ion. The interaction constant obtained for the hexavalent cation (U) with humic acid (Table I) is independent of pH (4-5) in the non-hydrolysis pH-range but some variation with uranium concentration is observed as for trivalent cations. Moreover, the complexation of uranium to humic substances is of the same order of magnitude than the complexation of trivalent actinides which corroborates chemical analogy between both cations. 

Jljig electrophoretic results on the interaction of Zn, Cd and Pb with humic acid (HAL sample) in different dilutions of sea-... 

Tombacz, E. et al.. Effect of pH and ionic strength on the interaction of humic acid with with aluminium oxide. Colloid Polym. Sci., 278, 337, 2000. 

Denecke MA, Reich T, Pompe S, Bubner M, Heise KH, Nitsche H, Allen PG Bucher JJ, Edelstein NM, Shuh DK, Czerwinski KR (1998b) EXAFS investigations of the interaction of humic acids and model compounds with uranyl cations in sohd complexes. Radiochim Acta 82 103-108 Dent AJ, Ramsay JDF, Swanton SW (1992) An EXAFS study of uranyl ions in solutions and sorbed onto sihca and montmorillonite clay colloids. J Colloid Interface Sci 150 45-60 d Espinose de la Caillerie J-B, Kermarec M, Clause (1995a) Impregnation of y-alumina with ( ) and ( ) ions at neutral pH Hydrotalcite-type coprecipitate formation and characterization J Am Chem Soc 117 11471-11481... 

M.L. Pacheco, E.M. Pena-Mendez and J. Havel, Supramolecular interaction of humic acids with organic and inorganic xenobiotics studied by capillary electrophoresis, Chemosphere, 51, 95-108, 2003. 

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