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EC number: 205-250-6
CAS number: 136-52-7
Relevant and reliable data that
could be used for classification and PNEC for freshwater algae were
retrieved for Pseudokirchneriella subcapitata. EC30 values, only,
were available for Chlamydomonas reinhardtiiand therefore were
not carried forward for hazard classification or PNEC derivation. For Pseudokirchneriella
subcapitata (the more sensitive species), reported EC50s ranged from
95 - 486 µg Co/L and the EC10s ranged from 22.0 - 297 µg Co/L;
variability is attributed to differences in the characteristics of the
test waters. Values used for CSA are reported as geometric means of
Relevant and reliable data that
could be used for classification and PNEC for marine algae were
retrieved for three different species: Champia parvula (seaweed), Skeletonema
costatum (marine diatom), and Dunaliella tertiolecta (marine
flagellate). The EC50s ranged from 24.1 µg Co/L for seaweed to 71314 µg
Co/L for flagellate to 100,000 µg Co/L for marine diatom. EC10s ranged
from 1.23 µg Co/L for seaweed to 590.3 µg Co/L for diatom and 11,961 µg
Co/L for marine flagellate. Test results were obtained in experiments
that followed international accepted guidance and were based on measured
levels of dissolved cobalt as cobalt dichloride.
the database of cobalt toxicity to freshwater algae, NOEC/EC10 high
quality values are reported for the Pseudokirchneriella subcapitata algae
species (Heijerick et al 2007; OSU 2015). Tables showing the EC10 values
of high quality that were used to derive the HC5 and aquatic freshwater
PNEC are in the attached document, as well as below.
High quality studies used for derivation of the freshwater aquatic EC50,
and the HC5 and PNEC
Value (mg Co/L)
Heijerick et al. 2007
the database of cobalt toxicity to marine algae, 10 high quality NOEC
and EC10 values are reported for three species. Toxicity values (EC10)
range from 1.23 μg
Co/L for growth of the marine algae, Champia parvula (CDI 2010m)
to 11961 μg
Co/L for growth of the marine flagellate, Dunaliella tertiolecta (CDI
2010l). The table below indicates the high quality EC10 values selected
for derivation of HC5 and the marine aquatic PNEC:
High quality studies used for derivation of the marine aquatic HC5 and
Champia parvula (seaweed)
Skeletonema costatum (marine diatom)
Dunaliella tertiolecta (marine flagellate)
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