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EC number: 629-732-4
CAS number: 1224966-13-5
The toxicity to aquatic algae in a valid algae study resulted in an 72 hour EC10 and EC50 based on growth of resp. 379.2 and 612.5 µg a.i./L
Two algae toxicity studies have been
performed. One study performed to assess the algae toxicity of a range
of comparable imidazoline products and one definitive study with Tall
oil, reaction products with tetraethylenepentamine (CAS no 68555 -22
-6). The 72 h EC10 based on growth is 395 µg/L related to the nomimal
test substance concentration. Corrected for active ingredient which is
96%, the EC10 is reduced to 379.2 µg/L. The test was performed with
river water as it is intended to be used in an evaluation of the
environmental risks based on the Bulk approach where it is essential to
show that the organisms were fully exposed to the nominal test
concentration. During the test a decrease of the concentration is
observed of about 70%. Imidazolines are susceptible to hydrolysis and
the decrease observed could therefore be assigned to either hydrolysis
or sorption or both processes. Imidazolines will however only hydrolyze
to an amidoamine which is relatively resistant to hydrolysis under
ambient conditions. As this hydrolysis will also occur under
environmental conditions and amidoamines have a comparable ecotoxicity
as the imidazolines the Nominal concentration based on active ingredient
is considered as the concentration to be used for the dose effect
assesment as no significant adsorption to glassware was observed and the
organisms were thus fully exposed the the nominal concentration based on
active ingredient. Initially to the imidazoline which gradually changed
into an amidoamine during the test. It is considered realistic to relate
the observed effects to the nominal values based on active ingredient.
The effects observed in the definitive study
are in good agreement with the results observed in the other study.
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