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EC number: 942-925-0
CAS number: -
The toxicity of zinc, 5,5'-azobis-2,4,6(1H,3H,5H)-pyrimidinetrione complexes and melamine to algae was tested in a GLP study following OECD201. The study reported of no effects after 72 hours of exposure at the limit test concentration (ErC50 >6.84 mg/L, ErL50 >100 mg/L, NOEC > 100 mg/L).
EC50 should read > 6.84 mg/L, the
NOEC should read >= 6.84 mg/L.
The study report gives EC50 > 6.84
mg/L and NOEC = 8.84 mg/L although no effect had been determined at the
limit test concentration. In the absence of an effect the NOEC should be
reported as >= 6.84 mg/L. Taking into account that the water solubility
of zinc, 5,5'-azobis-2,4,6(1H,3H,5H)-pyrimidinetrione complexes and
melamine is low with 0.52 mg/L no effects would be expected at higher
test concentrations. Concluding, the test item did not cause effects at
the test concentration which is higher than the water solubility.
Therefore, neither EC50 nor NOEC are relevant for PNEC derivation.
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