Occurrence and distribution of polyhalogenated carbazoles (PHCs) in sediments from the northern South China Sea

Polyhalogenated carbazoles (PHCs) have been frequently detected in various environments and have gained increasing attention due to their dioxin-like toxicity. In this study, 28 surface sediments and three sediment cores were collected from the northern South China Sea (SCS) to investigate the spati...

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Bibliographic Details
Published in:The Science of the total environment 2021-01, Vol.753, p.142072-142072, Article 142072
Main Authors: Zhou, Wenxiu, Chen, Weifang, Li, Peng, Gu, Zhaoyang, Peng, Jinghe, Lin, Kunde
Format: Article
Language:English
Subjects:
Emerging organic contaminants
Persistent organic pollutants
Polyhalogenated carbazoles
Sediment
South China Sea
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Summary:Polyhalogenated carbazoles (PHCs) have been frequently detected in various environments and have gained increasing attention due to their dioxin-like toxicity. In this study, 28 surface sediments and three sediment cores were collected from the northern South China Sea (SCS) to investigate the spatial and temporal distribution trends of PHCs. The total concentrations of PHCs in the surface sediments ranged from 0.25 ng/g to 3.10 ng/g, with a median concentration of 1.50 ng/g. The composition profiles of PHCs in the surface sediments were dominated by 3,6-dichlorocarbazole (36-CCZ), 3,6-dibromocarbazole (36-BCZ), and 1,3,6,8-tetrabromocarbazole (1368-BCZ). The total organic carbon (TOC) based concentrations of 36-CCZ, 1-bromo-3,6-dichlorocarbazole, 1,3,6,8-tetrachlorocarbazole, and 1368-BCZ showed significant positive correlation with water depth (r = 0.58–0.88, p values 
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2020.142072