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Fulvic acid description

Humic and fulvic acids contain various types of phenolic and carboxylic functional (hydrophilic) groups as well as aromatic and aliphatic moieties which import hydro-phobic properties to these substances. Fig. 4.12 gives a schematic idea on the composition of these substances. We refer to the book of Thurman (1985) and Aiken et al. (1985) for a description of the various properties of humic and fulvic acids in soils and waters and the book by Buffle (1988) for the coordinating properties of humus and humic acids. [Pg.112]

To maintain a focus on the use of tracers in DOM fractions, this chapter will present only brief descriptions of studies of bulk DOM properties, and will focus primarily on the use of trace moieties from the fulvic acid fraction in freshwater aquatic environments. In addition to being a major DOM fraction, fulvic acid is biogeochemically reactive in natural waters (see Maranger and Pullin, Chapter 8 Chin, Chapter 7 Moran and Covert, Chapter 10). Furthermore, current fractionation methods allow for relatively straightforward isolation of small quantities of fulvic acid from small volume filtered water samples (100-200 mL) in a reproducible manner, as well as for isolation of larger preparative quantities of material. We present examples to illustrate the use of particular trace moieties but do not present a comprehensive review of each trace moiety. [Pg.74]

Ephraim, J. H., Alegret, S., Mathuthu, A., Bicking, M., Malcom, R.L., and Marinsky, J. A. (1986). A unified physicochemical description of the protonationandmetal ion complex-ation equilibria of natural organic acids (humic and fulvic acids). 2. Influence of polyelectrolyte properties and functional group heterogeneity on the protonation equilibria of fulvic acid. Environ. Sci. Technol. 20, 354-366. [Pg.530]

Weng, L. et al.. Ligand and charge distribution (LCD) model for the description of fulvic acid adsorption to goethite, J. Colloid Interf. Sci., 302,442, 2006. [Pg.980]

Leppard, G. G., J. Buffle, and R. Baudat (1986), A Description of the Aggregation Properties of Aquatic Pedogenic Fulvic Acid Combining Physico-chemical and Microscopical Observations, Water Res. 20, 185-196. [Pg.170]

The detailed chemical structures of the organic components of soil and sediments are largely unknown, and terms such as humic acid and fulvic acid are primarily descriptive rather than representing chemically defined entities. A brief summary is given of studies aimed at providing information on the structural components of humic and fulvic acids. Further studies using specific chemical reactions are given below. [Pg.154]


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See also in sourсe #XX -- [ Pg.384 , Pg.385 , Pg.386 , Pg.387 , Pg.388 , Pg.389 , Pg.390 , Pg.391 , Pg.392 , Pg.393 ]




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