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EC number: 217-803-9
CAS number: 1962-75-0
A 72-Hour Acute Toxicity Test with Freshwater Green Alga,
Pseudokirchneriella subcapitata, was conducted on dibutyl terephthalate.
The test was conducted as a limit test at a concentration slightly above
the measured water solubility of the substance. Inhibition of 14 and 3%
was observed for 72-hour total yield and growth rate, respectively,
relative to the solvent control data. Therefore, the EC50 values for
72-hour yield and growth rate are greater than the average initial
measured concentration of 0.013 mg a.i./L. Since the average initial
measured concentration, 0.013 mg a.i./L, closely approximated the
functional limit of solubility of dibutyl terephthalate (DBT) in algal
medium, additional testing to further define the EC50 values was not
performed. The OECD Guideline #201 (OECD, 2006) suggests the EC20 value
may be used as the No-Observed Effect Concentration (NOEC). Growth
inhibition in this test did not exceed 14%.
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