Residues And Origins Of Dechlorane Plus And Its Related Compounds In Taizhou, China

Dechlorane Plus (DP), a typical chlorinated flame retardant, has been produced since 1960s. Due to the bans or restrictions on brominated diphenyl ethers all over the world, DP has been considered as one of the recommended substitutes. Recently, however, DP has drawn increasing attention because of its ubiquitous existence and potential adverse effects to human health. Corresponding researches of some DP related compounds, such as Dec 602, Dec 603, Dec 604, DPMA and the metabolites have also been concerned. E-waste recycling area is often regarded as a major resource of persistent organic pollutants (POPs). In this study, the residues of DP and the related compounds were investigated in soil, sediment and Ampullariidae (Ampullaria gigas spix) in Taizhou, China. Moreover, spacial distribution and congener compositions were discussed in order to analyze the origins of DP in studied places.The concentrations of DP in soil, sediment and Ampullariidae were 0.145 (0.026～0.705) ng/g dry weight (dw),6.23 (0.11-55.27) ng/g dw and 0.109 (0.033～0.279) ng/g dw, respectively, while those of Dec 602 were 5.42(0.69～28.56) pg/g dw,0.022(BDL (below detect limit)-0.38) pg/g dw and 3.47(BDL-40.26) pg/g dw, respectively. Other DP analogs such as Dec 603, Dec 604 and DPMA, and metabolites including aCl11DP and aChoDP were found in sediment, with detection rates of 16.1%,64.5%,22.6%,74.2% and 35.5%, respectively. The spacial distribution of DP suggested that the e-waste recycling industry could be the major resource in our research area, and the waste water from metal plants was a suspect of DP in sediment. The DP fsyn values (the propotion of syn-DP) decreased in sequence of commercial products (0.35)> soil and Ampullariidae (0.30)>> sediment (0.20～0.25), demonstrating that anti-DP is more resistant to environmental degradation. Lower fsynand high residual level of DP metabolites in sediment implied a long historic input. The fsyn values were relatively steadier in soil and sediment than in Ampullariidae, indicating a complex accumulation pattern of DP in organisms.