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Environmental fate & pathways

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No data on the behaviour of lanthanum oxide in the environment are available. The low water solubility of lanthanum oxide suggests that it may be found in sediment or soil. A soil absorption study with three soils using the batch equilibrium method according to OECD guideline No. 106 confirmed a strong absorption to soil with a log Koc of 6.36. Sediment absorption data are only available for lanthanum determined as lanthanum ions. Sediment absorption coefficients were derived using the FOREG data base. The 90th percentile log Kd was 6.84 and the 10th percentile log Kd was 4.74. This indicates a wide variation. Moermond et al (2005) developed a biological ligand model and determined that the sediment absorption is dependent mainly on pH, alkalinity, chlorine concentrations and the presence of complexing agents. Due to its physical chemical properties volatilisation is not expected to occur, based on the low vapour pressure and its iorganic ionic nature.