Biological monitoring of organochlorine pesticides using Anodontites trapesialis (Lam, 1819), (Bivalvia: Mycetopodidae) in a lotic environment-urban sewage

The contribution of domestic and industrial waste to the discharge of organochlorine compounds into the Pardo river, the major body of water in the northeast region of the state of São Paulo, was studied through the biological monitoring of the limnal bivalve anodontites trapesialis. The method used was gas-phase chromatography using a CG 35370 chromatograph. The results showed the abscense of organochlorine pesticide waste from the urban sewage of the city of Ribeirão Preto.

Biological monitoring of organochlorides using the limnic bisalves anodontites trapesialis: (Lam., 1819)

The mussel Anodontites trapesialis (Lam, 1819) was used as an indicator of organochloride pollutans in the Canoas River, located in the municpality of Mococa (21-25'08"S and 47W), State of Säo Paulo, Brazil. Biological monitoring was performed for one year at the site of an orange grove on the left bank of the river. Forty-five animals were placed in aluminum enclosures on the river bottom at this site and 4 animals were sacrificed for pesticide analysis at 3-month intevals, each corrsponding to one season of the year. Pesticides were extracted by the method of Bedford et al., (1968), modified, and the analyses were performed bay gas phase chromatography equipped with an elelctron capture detector. The aninals were found to have been exposed to DDT. Lindane and Heptachlor. Variation in Aldrin and Dieldrin levels was not significant enough to permit inferences. Endrin was not detected in any of the analyses