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EC number: 201-052-9
CAS number: 77-73-6
results were identified for the three trophic levels (algae,
invertebrates, and fish) with variable reliability. Key studies and
supporting studies are included in this report. A weight of evidence
approach has been taken for both the short term toxicity to fish and
short term toxicity to algae and cyanobacteria. The following sections
detail the robust summaries prepared for these studies in the
appropriate sections. The selected key study is also highlighted in the
lowest acute result was for aquatic invertebrates. A new proprietary
study conducted under GLP and to guideline has been used as the key
study for this endpoint. The study gives a 48 hour EC50 value
of 0.823 mg/L. Although a lower result is available for this endpoint,
this is taken from a study with no analytical confirmation of the test
concentrations and therefore the new proprietary study is considered
more robust. The use of the lower result would not change the
classification applied or the exposure assessment.
of the studies evaluated exceed the acute LC50 toxicity (T)
screening criteria of <0.1 mg/L. A further evaluation of the data on the
basis of the available NOECs indicates that the criteria in Annex XIII
of <0.01 mg/L for toxicity to aquatic organisms (fresh and marine) is
not exceeded. These values indicate that the toxicity criteria
stipulated in Annex XIII would not be met. Therefore, dicyclopentadiene
is not considered to be T within the PBT assessment on the basis of the
screening criterion and there is evidence that the criterion stipulated
in Annex XIII is also not met.
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