Halogenated flame retardants in surface sediments from fourteen estuaries, South China

Xie, Jinli; Sun, Yuxin; Cheng, Yuanyue; Chen, Yingzhen; Chen, Laiguo; Xie, Chenmin; Dai, Shouhui; Luo, Xiaojun; Zhang, Li; Mai, Bixian

Halogenated flame retardants in surface sediments from fourteen estuaries, South China

2021

A total of seventy surface sediments were collected from fourteen estuaries of South China to investigate the distribution of polybrominated diphenyl ethers (PBDEs), decabromodiphenyl ethane (DBDPE), 1,2-bis (2,4,6-tribromophenoxy) ethane (BTBPE) and dechlorane plus (DP). The concentrations of Σ₁₆PBDEs, DBDPE, BTBPE and DP in estuarine sediments ranged from 0.39 to 81.2, 0.18 to 49.9, not detected to 0.62, and 0.025 to 1.66 ng/g dry weight, respectively. Significant differences for levels of Σ₁₆PBDEs, DBDPE, BTBPE and DP were found among the sediments from fourteen estuaries. Sediments from the Pearl River Estuary had the highest concentrations of Σ₁₆PBDEs, DBDPE and DP. PBDEs and DBDPE were the main halogenated flame retardants in estuarine sediments. BDE 209 was predominant congener of PBDEs with an average contribution of 88.1% to the total PBDEs. 32.9% sediment samples from South China had fₐₙₜᵢ values lower than 0.65, suggesting that stereoselective enrichment of syn-DP occurred in estuarine sediments.

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