Surfactant (Genapol OX-80) toxicity to Selenastrum capricornutum.
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.
Anastácio
P M
PM
IMAR, Department of Ecology, University of Evora, Portugal. anast@evunix.uevora.pt
Lützhøft
H C
HC
Halling-Sørensen
B
B
Marques
J C
JC
D000383:Agriculture; D000818:Animals; D003400:Astacoidea; D004305:Dose-Response Relationship, Drug; D056890:Eukaryota / Q000187:drug effects / Q000502:physiology*; D007928:Lethal Dose 50; D010571:Pest Control; D013501:Surface-Active Agents / Q000633:toxicity*; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical