Registration Dossier

Environmental fate & pathways

Bioaccumulation: terrestrial

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

In general, cobalt is not largely concentrated from soil into plant or soil into invertebrate or vertebrates, with BCF/BSAFs or trophic ratios less than 0.5. One study (out of ten terrestrial studies) was of sufficient quality to meet data quality objectives. With a BSAF of 0.0586, the terrestrial earthworm study by Crossley et al (1995) indicates that earthworms assimilate only small amounts of cobalt from mineral soil, and that any assimilation of cobalt must be from the organic fraction of soils. The review by Gal et al (2008) reiterates this finding, with a BCF <<0.5 for most plants. Plant hyperaccumulators have been identified that have the ability to accumulate especially high concentrations of cobalt (concentrations ranging from 0 to 1400 ppm). The distribution of cobalt in plants is species dependent and cobalt availability is associated with cobalt bioavailability from soil being a function of soil pH and MnO2levels. In a review of vertebrate metals bioaccumulation with a number of elements, Sample et al (1998) showed that uptake ratios from soil to organism for cobalt is < 0.2, even accounting for dietary variability, i.e.herbivore (diet consisting primarily of plant material), and omnivore (diet consisting of both animal and plant material).