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Ecotoxicological tests were carried out to determine the effects of crude oil, Diesel 2 and kerosene on the population growth of the diatom Chaetoceros gracilis. The mean effective concentration (CE50%) at an exposure time of 96 h was determined. The solution with Diesel 2 was more toxic (90 mg·L –1 ), followed by the solution with kerosene (98 mg·L –1 ) and the solution with crude oil (867.5 mg·L –1 ). In addition, the effects of the three organic compounds on the

EFECTOS ECOTOXICOLOGICOS DEL PETROLEO CRUDO, DIESEL 2 Y KEROSENE SOBRE EL CRECIMIENTO POBLACIONAL DE LA MICROALGA Chaetoceros gracilis Schutt