Los difenil éteres polibromados (PBDEs) constituyen un grupo de aditivos retardantes de llama y se pueden encontrar principalmente en los aparatos eléctricos, textiles y muebles. Los PBDE se utilizan como aditivos para polímeros y resinas y se cree que son liberados al medio ambiente más fácilmente que los retardantes de llama reactivos. Los PBDEs constan de dos anillos de bencénicos, conectados por un puente éter (oxígeno), cada anillo puede contener hasta 5 átomos de bromo. Hay unos 209 posibles congéneres de PBDEs en función del número de átomos de bromo su posición, con pesos moleculares que oscilan desde 249 hasta 960 daltons. (leer más)

Toxicological effects of three polybromodiphenyl Ethers (BDE-47, 99 and 154) on growth of marine algae Isochrysis galbana

Polybrominated diphenyl ethers (PBDEs) are highly persistent anthropogenic contaminants found in trace amounts in many environmental compartments far from their source areas, posing a risk to aquatic ecosystems. Our objective was to determine the relative toxicities of three BDE congeners such as BDE-47, 99 and 154 on marine phytoplankton algae Isochrysis galbana. For a highly sensitive endpoint: a 72h-inhibition of autotrophic growth rate was calculated according to standards methods. No observable effect concentration (NOEC) values were 2.53, 3.48 and 12.3 μg L-1 for BDE-47, 99 and 154, respectively and LOEC values were 5.06, 6.96 and 24.60 μg L-1 for BDE-47, 99 and 154, respectively. The calculated IC10 (the concentration inhibiting growth rate by 10%) corresponded to 9.3, 12.78 and 54.6 μg L-1 for BDE-47, 99 and 154, respectively. The 50% inhibitions of growth ate (IC50).

Background, aim and scope The environmental presence of polybrominated diphenyl ethers (PBDEs), among which BDE-47 and DE-99 are particularly abundant, makes toxicity data necessary to assess the hazard risk posed by PBDE to aquatic organisms. This study examines the effects of BDE-47 and BDE-99 on embryo-larval stages of the marine flatfish turbot. (ver galería completa)