Runoff water was analysed chemically and evaluated for its possible environmental impact, using both a biosensor test with the bacteria Alcaligenes eutrophus (BiometR) and the conventional 72 h growth inhibition test with the green alga Raphidocelis subcapitata.
Chemical speciation modelling revealed that most zinc (94.3?99.9%) was present as the free Zn ion, the most bioavailable speciation form.
Both chemicals are toxic to medaka, in particular Zpt, which also causes teratogenic effects such as spinal cord deformities in embryos at very low, sublethal concentrations.
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