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EC number: 700-111-0
CAS number: 148528-05-6
Measured MODA concentrations (mg/L)
nd : none
detected (< 0.5 mg/L).
% ti : mean
measured concentration after 48 hours expressed as a percentage of the
%N : mean
measured concentration expressed as a percentage of the nominal
* : arithmetic
At all concentrations, the intended exposure levels of MODA were
adequately achieved (between 91 and 113% of their nominal values) and
maintained during the test (between 84 and 101% of their starting
values) irrespective of whether the pH of the media was adjusted. The
overall mean measured levels of MODA were 4.41, 9.06, 21.1, 48.6 and
97.8 mg/L in non-adjusted media and 21.0, 47.0 and 100 mg/L in media
where the pH had been adjusted.
After 48 hours in the non-adjusted media, the lowest measured
concentration resulting in 100% immobility was 97.8 mg/L and the highest
concentration at which no immobilisation occurred was 21.1 mg/L. After
48 hours in the pH-adjusted media 70% of the Daphnia were immobile at
100 mg/L and the highest concentration at which no immobilisation
occurred was 21.0 mg/L.
The 48-hour EC50 of MODA for the immobilisation of Daphnia magna in non-adjusted media was 37.5 mg/L (95% confidence limits of 34.0 and 48.6 mg/L) and in pH-adjusted media it was 62.8 mg/L (95% confidence limits of 49.1 and 84.1 mg/L).
The ‘no-observed effect concentration’ of MODA with Daphnia magna was
21.1 and 21.0 mg/L respectively, in non-adjusted and pH-adjusted media.
These results suggest that the pH of the test media, increased by the
presence of the test substance, was partially responsible for the
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