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EC number: 201-067-0
CAS number: 77-90-7
growth rate72 h NOEC: 4.65 mg/L72 h LOEC: 10.9 mg/L72 h EC50: 74.5 mg/L (95% c.l. could not be determined)yield72 h NOEC: 4.65 mg/L72 h LOEC: 10.9 mg/L72 h EC50: 11.5 mg/L (95% c.l. could not be determined)
The toxicity of tributyl acetylcitrate towards algae was investigated in
a study conducted according to EU Method C.3 (Algal Inhibition test;
2008) and OECD Guideline 201 (Alga, Growth Inhibition Test; 2006). Based
on the results of a screening test, test substance concentrations of 10,
20, 40, 80, and 100 mg/L nominal were used. Due to the poor water
solubility of the test substance water accommodated fractions were
prepared and used in the tests. The stability of the test substance was
checked by IR measurements. Based on the comparison of test substance
concentrations/recoveries at time 0 and after 72h it can be concluded
that the test substance was stable during the test duration (recovery
94.9 - 124.2 % of initial concentration). However, the measured
concentrations deviated more than 20 % from the nominal values. Based on
this, the reported effect concentrations refer to mean measured
concentrations (arithmetic mean). For the evaluation of the effects the
mean values of the cell numbers per treatment were used.
With respect to growth rate, the 72 h NOEC and LOEC values were
determined to be 4.65 and 10.9 mg/L, respectively; the 72 h EC50 was
determined to be 74.4 mg/L. In respect to yield, the 72 h NOEC and LOEC
values were determined to be 4.5 and 10.9 mg/L, respectively; the 72 h
EC50 was determined to be 11.5 mg/L. The 95% C.I. could not be
determined due to mathematical reasons.
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