Soil adsorption desorption

M Company (2001d) Soil adsorption/desorption study of potassium perfluorooctane sulfonate (PFOS). 3M Company, 3M Environmental Laboratory, Laboratory Project Number E00-1311, EPA Docket AR226-1030a030... 

A soil adsorption/desorption screening test is part of the Base Set. but notiEcations will be accepted without this until the proposed reverse-phase high performance liquid chromatography method is Enalised, as rm alteraaEve to the OECD screening test. 

Parlq)ian P, Anuralqtongsatorn P, Patrick WHJ. 1998. Adsorption, desorption and degradation of a-endosulfan in tropical soils of Thailand. J Environ Sci Health B 33(3) 211-233. 

Although in many. soils with tow P availability, significant desorption of sparingly soluble Pi forms requires at least millimolar concentration levels of specific carboxylates (e.g., citrate, oxalate) in the soil solution, much lower concentrations (0.1 mM) were necessary to reduce. soil adsorption of Pi, which was applied simultaneously with carboxylates (100). Thus, competition of carboxylates with Pi for P sorption sites in the soil matrix may be a mechanism that can. 

Adsorption-desorption Partly Mechanisms for adsorption on similar materials will be similar. Soil adsorption data generally do not reflect the saturated conditions of the deep-well environment. Organic-matter content is a major factor affecting adsorption in the near-surface its significance in the deep-well environment is less clear. Fate studies involving artificial recharge are probably useful, but differences between fresh waters and deep brines may reduce relevance. 

Adsorption, desorption and degradation are simulated in each of the four soil layers (Figure 6). Different parameters can be used in each layer. 

Concentrations of trace elements in soil solution may be controlled by the solubility of certain solid phases via dissolution/(co-)precipitation or by other physicochemical and biological processes such as adsorption-desorption, complexation, and redox reactions. 

Dang et al. (1994) observed that the experimentally determined solubility lines for Zn2+ in 14 soil solutions from southern Queensland with soil pH from 7.45-8.98 and 0.08-2.07% CaC03 were not undersaturated with respect to the solubility of any known mineral form of Zn. Therefore, they suggested that Zn2+ activity was mainly controlled by adsorption-desorption reactions in these soils. Similar observation on solubility of Cr(VI) in arid soils was reported by Rai et al. (1989). In the absence of a solubility controlling solid phase, Cr(VI) aqueous concentrations under slightly alkaline conditions may be primarily controlled by adsorption/desorption reactions (Rai et al., 1989). Chromuim(VI) is adsorbed by iron and aluminum oxides, and kaolinite and its adsorption decreases with increasing pH. 

Exchangeable ions (EXC), sometimes including ions nonspecifically adsorbed and specifically absorbed on the surface of various soil components, such as carbonate, organic matter, Fe, Mn, Si, and Al oxides, and clay minerals. This part is controlled by adsorption-desorption processes. 

Zinc sorbed in the untreated soil after desorption was less than that in the soil with organic matter removed (Kingery et al., 1999). This shows that the Zn maintained in the soil solid phase after desorption was proportional to Zn adsorption of the soil solid-phase. A strong hysteresis between Zn desorption and Zn adsorption curves was found in the untreated and treated soils. This indicates that some sorbed Zn is in the nonexchangeable form and on the specific adsorption sites on soil solid-phase components. 

The adsorption/desorption kinetics of Zn on soils with the removal of organic matter and Fe oxides were studied by Kingery et al. (1999) using traditional batch experiments on the same soil used by Hinz and Selim (1999). Adsorption of Zn on the three soils was kinetically characterized by three kinetic rates a very fast initial retention process within 30 min, an intermediate retention process from 30 min to 8 hours, followed by the very slow process (Fig. 5.5). About 50% of Zn was adsorbed on the three soils within the initial first 30 min. Initially, Zn desorption increased with time during the first 20 minutes from both the untreated soils and the soils without organic matter and Fe oxides. However, after 20 minutes of adsorption, net Zn adsorption from the whole soil and the soil with the... 

Brununer G.W., Tiller K.G., Herms U., Clayton P.M. Adsorption-desorption and/or precipitation-dissolution processes of zinc in soils. Geoderma 1983 31 337-354. 

Kingery W.L, Oppenheimer S.F., Elan F.X., Selim H.M. Adsorption/desorption hysteresis of trace metals with soil components A Dynamical systems approach. Proceedings of the Fifth International Conference on the Biogeochemistry of Trace Elements, Vienna, Austria. 1999. 

Liu F, De Cristofaro A, Violante A (2001) Effect of pH phosphate and oxalate on the adsorption/desorption of arsenate on/from goethite. Soil Sci 166 197-208 Livesey NT, Huang PM (1981) Adsorption of arsenate by soils and its relation to selected properties and anions. Soil Sci 131 88-94 Manceau A (1995) The mechanism of anion adsorption on iron oxides Evidence for the bonding of arsenate tetrahedra on free Fe(0, OH)6 edges. Geochim Cosmochim Acta 59 3647-3653. 

Manoj VB, Gajbhiye VT (2007) Adsorption-desorption and leaching of bifenthrin in soil. Pestic Res J 19 257-261... 

Ismail BS, Kalithasan K (2004) Adsorption, desorption, and mobility of permethrin in Malaysian soils. J Environ Sci Health B39 419—429... 

Further adsorption/desorption study 14-day earthworm toxicity Study of the effects on soil microorganisms Short-term toxicity to plants... 

The fast reactions of ions between aqueous and mineral phases have been studied extensively in a variety of fields including colloidal chemistry, geochemistry, environmental engineering, soil science, and catalysis (1-6). Various experimental approaches and techniques have been utilized to address the questions of interest in any given field as this volume exemplifies. Recently, chemical relaxation techniques have been applied to study the kinetics of interaction of ions with minerals in aqueous suspension (2). These methods allow mechanistic information to be obtained for elementary processes which occur rapidly, e.g., for processes which occur within seconds to as fast as nanoseconds (j0. Many important phenomena can be studied including adsorption/desorption reactions of ions at electri fied interfaces and intercalation/deintercalation of ions with minerals having unique interlayer structure. 

Fig. 13. Use of the Freundlich equation to describe adsorption/desorption on soils. Part I refers to the linear portion of the isotherm (initial concentration < 100 mg/1) while Part II refers to the nonlinear portion of the isotherm...

Bowman, B.T. and Sans, W.W. Adsorption, desorption, soil mobility, aqueous persistence and octanol-water partitioning coefficients of terbufos, terbufos sulfoxide and terbufos sulfone, J. Environ. Sol. Health, B17(5) 447-462, 1982. 

Businelli, D. Pig slurry amendment and herbicide coapplication effects on s-triazine mobility in soil an adsorption-desorption... 

Nathwani, J.S. and Phillips, C.R. Adsorption-desorption of selected hydrocarbons in crude oil on soils, Chemosphere, 6(4) 157-162, 1977. 

Saltzman, S., Kliger, L., and Yaron, B. Adsorption-desorption of parathion as affected by soil organic matter. /. Agric. Food Chem., 20(6) 1224-1226, 1972. 

Adsorption-desorption coefficients are determined by various experimental techniques related to the status of a contaminant (solute or gas) under static or continuous conditions. Solute adsorption-desorption is determined mainly by batch or column equilibration procedures. A comprehensive description of various experimental techniques for determining the kinetics of soil chemical processes, including adsorption-desorption, may be found in the book by Sparks (1989) and in many papers (e.g., Nielsen and Biggar 1961 Bowman 1979 Boyd and King 1984 Peterson et al. 1988 Podoll et al. 1989 Abdul et al. 1990 Brusseau et al. 1990 Hermosin and Camejo 1992 Farrell and Reinhard 1994 Schrap et al. 1994 Petersen et al. 1995). 

Fig. 8.47 Phenanthrene adsorption-desorption hysteresis observed for Lachine and Chelsa humic acid aggregate the hysteresis index is given by n. Reprinted from Huang W, Peng, P. Yu, Z. and Fu J (2003) Effects of organic matter heterogeneity on sorption and desorption of organic contaminants by soils and sediments. Appl Geochem 18 955-972. Copyright 2003 with permission of Elsevier...

Bolt GH, De Boodt MF, Hayes ME, McBride MB (eds) (1991) Interactions at the soil coUoid-solution interface. NATO ASI Series—Applied Science—Series E vol 190, Kluwer, Dordrecht Bowman BT (1979) Method of repeated additions for generating pesticide adsorption-desorption isotherm data. Can J Soil Sci 59 435-437... 

Liu C, Zachara JM, Smith SC, McKinley JP, Ainsworth CC (2003) Desorption kinetics of radiocesium from subsurface sediments at Hanford Site USA. Geochim Cosmochim Acta 67 2893-2912 Loffredo E, Senesi N (2006) Eate of anthropogenic organic pollutants in soils with emphasis on adsorption/desorption processes of endocrine disruptor compounds. Pure App Chem 78 947-961... 

Undabeytia T, Morillo E, Ramos AB, Maqueda C (2002) Mutual influence of Cu and a cationic herbicide on their adsorption-desorption processes on two selected soils. Water, Air Soil Poll 137 81-94B... 

Yaron B, Sutherland P, Galin T, et al. 1989. Soil pollution by petroleum products n. Adsorption-desorption of "kerosene" vapors on soils. Journal of Contaminant Hydrology 4 347-358. 

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