Registration Dossier
Registration Dossier
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EC number: 212-751-3 | CAS number: 866-81-9
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
An EC10(21d) on shoot biomass of Brassica napa in soils of pH 4.36 was calculated as 3.1 mg Tricobalt dicitrate/kg soil d.w., measured as 1 mg Co/kg soil d.w.
Key value for chemical safety assessment
- Short-term EC50 or LC50 for terrestrial plants:
- 21.8 mg/kg soil dw
- Long-term EC10, LC10 or NOEC for terrestrial plants:
- 3.1 mg/kg soil dw
Additional information
Data on terrestrial plants toxicity tests resulting in high quality EC10 and EC50 values (expressed as Co) for terrestrial plants (n=3) are summarised in Table 2 of the WHO CICAD document, 2006 (see attached report in Chapter 13). The key study (2009) was, however, not included in the WHO CICAD document of 2006.
The key study (Li et al. 2009) investigated three plants in 10 different soils, with the overall lowest EC10(21d) value for Brassica napa of 1 mg Co/kg soil d.w. corresponding to 4.2 mg cobalt hydrogencitrate/kg soil d.w. The range of EC10 values in the study varied from 1 mg Co/kg soil d.w. for Brassica napa and Lycopersicon esculentum to 617 mg Co/kg soil d.w. for Hordeum vulgare. Generally, a higher sensitivity to cobalt was observed in soils of lower pH. Brassica napa was the most sensitive species, followed by Lycopersicon esculentum and least sensitive Hordeum vulgare.
Two additional studies report EC20 values based on growth of Medicago sativa, Hordeum vulgare and Raphanus sativus which ranged from 0.6 to 45.2 mg Co/kg soil d.w. (US EPA 2005), with citrus fruits showing no effect concentrations <100 mg Co/kg soil d.w. (Vanselow 1966). The overall range corresponds to EC20 values of 1.9 to 311 mg Tricobalt dicitrate/kg soil d.w.
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