Actinium, Radioactive

Environmental Fate

TERRESTRIAL FATE: Actinium ions would be expected to adsorb to soils(SRC), since actinide ions with III, IV, and VI oxidation states can be adsorbed to cation-exchange resins(1). Actinium is primarily found in its +3 oxidation state as either the oxide, hydroxide, or halide salt(1,2). Actinium compounds are ionic and would not volatilize from moist or dry soil surfaces(SRC).
AQUATIC FATE: Actinium ions would be expected to adsorb to suspended particles in water(SRC), since actinide ions with III, IV, and VI oxidation states can be adsorbed to cation-exchange resins(1). The predominant oxidation state of actinium is +3(1), and this would be the oxidation state most likely present under environmental conditions(SRC). Since actinium compounds are ionic, they will not volatilize from water surfaces(SRC). Bioconcentration is not expected to be an important fate due to the ionic nature of actinium compounds(SRC).
ATMOSPHERIC FATE: Actinium compounds are ionic and would not be volatile and would exist solely in the particulate phase in the ambient atmosphere. Particulate-phase actinium compounds will be removed from the atmosphere by wet or dry deposition. (SRC)
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