p-Tert-Butylphenol - UNEP Chemicals

OECD SIDS P-TERT-BUTYLPHENOL
According to a German exposure information, German proposed to integrate a generic exposure
scenario using following parameters.
Production volume: 10,000 tonnes/year (maximum production volume given in
IUCLID)
Emission factor: 1 % (production and processing at the same site)
Number of production days: 300 days/year
Elimination in stp: 91 % (according to the Simpletreat)
Flow-rate of receiving river: 60 m 3 /s (according to the TGD)
With this data, a PEClocal of about 5.8 x 10 -3 mg/l can be calculated.
b. Regional exposure
No data are available.
3.2 Effects on the Environments
Acute and chronic toxicity data of p-t-butylphenol to aquatic organisms are summarized in Table 1.
As the lowest acute and chronic toxicity data, 48h EC50 of Daphnia magna (3.4 mg/l) and 21d
NOEC (reproduction) of Daphnia magna (0.73 mg/l) were selected, respectively. An assessment
factor of 100 was chosen and applied to the chronic toxicity data to determine PNEC (according to
the OECD Provisional Guidance for Initial Assessment of Aquatic Effects), because only two
NOEC values (algae and Daphnia) were available.
From the lowest chronic toxicity value 0.73 mg/l (21 d NOEC of Daphnia) and the assessment
factor 100 : PNEC = 0.73/ 100 = 0.0073 mg/l
Table 1. Acute and chronic toxicity data of p-tert-Butylphenol
to aquatic organisms at different trophic levels.
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Species Endpoint Conc. (mg/l) Notes
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Selenastrum capricornutum Bms 72h EC50 22.7 a, 1)
(algae) 72h NOEC 9.53 c, 1)
Tetrahymena pyriformis Pgr 60h IC50 18.4 a, 2)
(protozoa)
Daphnia magna Imm 24h EC50 7.3 a, 1)
(water flea) 48h EC50 6.7 a, 1)
Rep 21d NOEC 0.73 c, 1), C
Daphnia magna Imm 48h EC50 3.4 a, 3), A
Crangon septemspinosa Mor 96h LC50 1.9 a, 4)
(shrimp)
Oryzias latipes (fish) Mor 24h LC50 5.1 a, 1)
48h LC50 5.1 a, 1)
72h LC50 5.1 a, 1)
UNEP Publications 69