Pyrethroids in the MAB reserve Mar Chiquita coastal lagoon: An approach to evaluate the probabilistic risks of pyrethroids on estuarine organisms

GONZALEZ, MARIANA; ELJARRAT, ETHEL; TUCCA, F; MIGLIORANZA, K.S.B.; DÍAZ JARAMILLO, MAURICIO J; MARTINEZ, DANIEL

Cartagena

Congreso; SETAC Latin America 13th Biennial Meeting; 2019

SETAC LA

activities as the agriculture, forestry, horticulture and public health, being active ingredients to control insect pests in a variaty of crops as well as for domestic uses. Once pyrethroids are released to aquatic environment, they are characterized to be strongly hydrophobic and low soluble in water, being these rapidly associated to suspendedparticles or biological tissues. Mar Chiquita estuary (Buenos Aires, Argentina) is an UNESCO-Man and the Biosphere (MAB) protected area that is connected by several streams, which are influenced by different agricultural activities. The main objective of this study was to determine the presence of pyrethroids in environmental samples from Mar Chiquita basin and to determine the ecological risk probabilistic on aquatic organisms (estuarine/marine and freshwater species). Both sediment and particulate matter samples were extracted through soxhlet and quantified by using GC-MS. Ecotoxicological information for pyrethroids were compiled from open literature (i.e., ECOTOX database, ECHA, ETOX, among others), and then an probabilistic method was used to calculate the Hazardous Concentration (HC5) derived from Species Sensitivity Distribution (SSD). Preliminary results show the occurrence of 13 pyrethroid insecticides in environmental samples, with high abundance of permethrin. The SSD curves reported higher vulnerability for estuarine species with HC5 of 1.7 ng L-1 (CI95%= 0.2 - 18.4 ng L-1). In conclusion, this study showed a first approach to know the environmental presence of pyrethroids in protected areas from South America and its ecological impact on aquatic organisms.