POPs in the South Latin America: Bioaccumulation of DDT, PCB, HCB, HCH and Mirex in blubber of common dolphin (Delphinus delphis) and Fraser's dolphin (Lagenodelphis hosei) from Argentina

ALEXANDRE AZEVEDO ; CRISTIAN ALBERTO DURANTE ; ENRIQUE ALBERTO CRESPO ; ELITIERI BATISTA SANTOS-NETO ; JOSÉ LAILSON-BRITO

SCIENCE OF THE TOTAL ENVIRONMENT

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 572 p. 352 - 360

0048-9697

Organic compounds, in particular organochlorines, are highly persistent compounds which accumulate in biotic and abiotic substrates. Marine mammals bioaccumulate and biomagnify persistent organic pollutants (POPs) through diet. ΣPCB (26 PCB congeners), ΣDDT (pp-DDT, pp-DDD, pp-DDE),ΣHCH (α-HCH, β-HCH, γ- HCH, δ-HCH), HCB and mirex were analyzed from samples of subcutaneous adipose tissue of common dolphins, Delphinus delphis, and Fraser's dolphins, Lagenodelphis hosei, obtained in 1999 and 2012. The aimof this studywas to determine the concentrations of POPs to get baseline information on the current state of pollution by these compounds in these two species in South Atlantic. At the same time, to assess concentrations of POPs in relation to age, the total length and sexual maturity in common dolphins. Organochlorine pesticides dominated Fraser's dolphins, DDT being the most abundant, while PCBs were mostly present in common dolphins. In both species, the distributions of isomers or metabolites followed the order: β-HCHNδ-HCHNγ-HCHNα-HCH and pp- DDENpp-DDDNpp-DDT. As forΣPCB, the largest contributionwas given by congeners of highmolecularweight,