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Environmental fate & pathways

Adsorption / desorption

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Key value for chemical safety assessment

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Experimental data on the adsorption/ desorption of Triiron bis(orthophosphate) (CAS 14940-41-1) are not available. Testing the adsorption/ desorption behavior to OECD Guideline 121 is not feasible as the method is not validated for inorganic substances. A batch equilibrium study or leaching study did not conducted for Boron orthophosphate considering a high background values and low water solubility of the substance.

Adsorption and uptake processes between microorganism and the aqueous solution play an important role for mobility, reactivity and the bioavailability of iron in aqueous solution (sec. source in González et al. 2014). Transformations of iron by microorganisms are often much faster than the respective chemical reactions. They occur in most soils and sediments, both in freshwater and marine environments (Thamdrup 2000; Straub et al. 2001; Cornell and Schwertmann 2003).

In a study from Kouakou et al. (2013), the removal of Fe2+from wastewater was around 70%.

References.

Cornell R. M. and Schwertmann U. (2003). The iron Oxides: Structures, Properties, Reactions, Occurrences and Uses. Wiley-VCH, Weinheim

González A.G., Pokrovsky O.S., Jiménez-Villacorta F., Shirokova L.S., Santana-Casiano J.M., González-Dávila M. and Emnova E.E. (2014). Iron adsorption onto soil and aquatic bacteria: XAS structural study. Chemical Geology 372, 32-45

Kouakou U., Ello A.S., Yapo J.A. and Trokourey A. (2013). Adsorption of iron and zinc on commercial activated carbon. academicJournals, Vol. 5(6), pp. 168-171

Straub K. L., Benz M., Schink B. (2001). Iron metabolism in anoxic environments at near neutral pH. FEMS Microbiol Ecol 34: 181-186

Thamdrup B. (2000). Bacterial manganese and iron reduction in aquatic sediments. In: Advances in microbial ecology. Schink B. (ed) Kluwer Academic/ Plenum Publishers, New York, p 41-84