| http://www.w3.org/ns/prov#value | - EC50 values of >1000 mg l-1 were determined for Zn2+ and 1.7-4.79 mg l-1 for Cr6+ indicating variability in assays that rely on conditions imposed including exposure time, species tested and criteria used in the final assessment.An interesting observation is the enhanced stimulation of light output in some systems with a low concentration of toxicant.
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