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EC number: 939-253-5
CAS number: 68424-85-1
The 96 and 72 hour ErC50 values for growth inhibition of freshwater algae ranged between 0.03 - 0.049 mg a.i./L. The 96 and 72 hour EbC50 values for biomass ranged between 0.02 and 0.014 mg a.i./L. The ErC10 values for growth rate were 0.009 and 0.0144 mg a.i./L.
Toxicity of C12-C16 ADBAC to the freshwater
algae Selenastrum capricornutum was determined over an exposure
period of 96 hours according to OECD guidelines. The test was conducted
at the nominal concentrations of 0.005, 0.015, 0.045, 0.136 and 0.407
mg/L (50.2% pure substance). Analytical determination was performed for
the test substance. The EbC50and ErC50(0-96 hours)
of the 50.2% pure test substance were 0.02 mg/L (approximately
equivalent to 0.01 mg a.i./L; 0.02 - 0.03; 95% confidence limits) and
0.06 mg/L (approximately equivalent to 0.03 mg a.i./L; 0.06 - 0.07; 95%
confidence limits), respectively. The
ErC10 and EbC10 values were estimated to be 0.0114 and 0.002 mg a.i./L. The
LOEC was 0.005 mg/L and the NOEC < 0.005 mg/L (equivalent to 0.0025 mg
a.i./L) based on growth rate. Chemical analysis of duplicate samples
taken at the beginning (96% recovery) and at the end (98% recovery) of
the test indicated that the exposure concentrations were substantially
achieved (Kroon AGM et al.,1996).
In another OECD guideline study, the toxicity
of C12-C16 ADBAC to Selenastrum capricornutum was determined over
an exposure period of 72 hours. The test was conducted at the nominal
concentrations of 0, 3.7, 13, 24, 43, 136 and 431 µg a.i./L (50% pure
substance). The test substance concentrations were determined at the
start of the test and after 23, 47 and 71 hours of incubation. Algal
growth was determined at 0, 23, 47 and 71 hours. The ErC50and
EbC50(0-72 hours) of the 50% pure test substance were 49 µg/L
(40 - 61; 95% confidence limits) and 14 µg a.i./L (11 - 22; 95%
confidence limits), respectively. The NOEC determined from the results
for the test substance was equal to or less than 1.2 µg/L based on
growth rate. Test substance concentrations were found to be relatively
stable during the test and the mean measured test substance
concentrations of 0, 1.2, 5.1, 11, 22, 98 and 382 µg/L were used for
calculation of effect parameters. Statistical assessment of data by
application of parametric model indicated a significant effect on the
growth rate only. The ErC10 was
determined to be 0.009 mg a.i./L.
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