Registration Dossier
Registration Dossier
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EC number: 235-101-0 | CAS number: 12068-53-0
Endpoint summary
Administrative data
Description of key information
Additional information
Due to its low solubility in water, Zinc aluminium oxide will mainly remain undissolved under neutral environmental conditions and will deposit in soil or sediment. A minor fraction may dissolve into the aqueous phase under acidic or alkaline conditions. In this case each metal will undergo speciation in function of the environmental conditions. The speciation and adsorption of metals in the environment depends on a number of parameters, such as pH, redox potential, DOC and the presence of anions or complexing agents. Solids-water partition coefficients (log Kpsusp) derived from measured data for zinc range from 3.43 to 5.04 (Popp and Laquer, 1980; Li et al., 1984; Stortelder et al., 1989; Venema, 1994; Koelmans and Radovanovic, 1997; Yland and Smedes, 1996; Yland, 1996). For aluminium, log Kd values between 3 and 5 were obtained in a chemical simulation that included aqueous aluminium speciation (inorganic and organic), aluminium solubility, and complexation by NOM. Both metals are also naturally present in the environment. Mean concentrations for aluminium and zinc in water of 0.076 mg/L and 0.006 mg/L, respectively, have been reported by Salminen et al. (2005).
Biodegradation is not relevant for Zinc aluminium oxide, since the substance is inorganic. Aluminium and zinc may participate in hydrolysis reactions, thereby forming a number of monomeric and polymeric hydroxides and this process is highly dependent on pH. However, aluminium and zinc will persist in the environment irrespective of whatever chemical species are formed as a result of hydrolysis.
References:
Li, Y et al. 1984. Desorption and coagulation of trace elements during estuarine mixing. Geochimica et Cosmochimica Acta, 48: 1879-1884
Koelmans, AA and H Radovanovic. 1997. Modelling trace metal distribution in surface waters, Model formulations and calibration. Wageningen Agriculture University.
Popp, C.J. and Laquer, F. 1980. Trace metal transport and partitioning in the suspended sediments of the Rio Grande and tributaries in central New Mexico: Chemosphere, v. 9, pp. 89-98.
Stortelder et al. 1989. Perspectives for water organisms (part 1 and 2). DBW/RIZA Nota No. 89.016a+b, Lelystad, NL.
Venema. 1994. Gehalte in zwevend stof, meten of berekenen? RIZA werkdocument 94064x, RIZA, Lelystad, NL.
Yland, E. 1996. Partitiecoëfficiënten tussen sediment en water voor metalen berekend uit mariene monitoringsgegevens en analyse van het aandeel van de achtergrondwaarde op de zwevend stof/water coëfficiënt. RIKZ/OS96.141 x (in Dutch).
Yland, E and Smedes F. 1996. Partitiecoëfficiënten tussen zwevend stof en water voor metalen berekend uit mariene monitoringsgegevens. RIKZ/OS96.117 x (in Dutch).
Salminen, R. (chief-editor, 2005) Geochemical Atlas of Europe. ISBN 951-690-913-2 (electronic version:http://www.gsf.fi/publ/foregsatlas/maps_table.php)
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