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Surfactant (Genapol OX-80) toxicity to Selenastrum capricornutum
P M Anastácio1, H C Lützhøft, B Halling-Sørensen
1IMAR, Department of Ecology, University of Evora, Portugal. anast@evunix.uevora.pt
Abstract:
A non-ionic surfactant (Genapol OX-80) was proposed as a means of reducing destructive crayfish activity in rice. In order to study the toxicity of this product on algae, a test in accordance to the ISO 8692 protocol (1989) was performed. The growth inhibiting effect of the pure formulation of Genapol OX-80 was studied on Selenastrum capricornutum in the concentration range of 0.01-1.0 mg/l. The result indicated a 72 h EC50-value of 0.5 mg/l. The suggested field concentration of approximately 50 mg/l is therefore two orders of magnitude above the algal EC50-value. From our findings it is expected that the impact on the rice field algae will not be negligible.