Occurrence, sources, partitioning and ecological risk of short- and medium-chain chlorinated paraffins in river water and sediments in Shanghai.
Sci Total Environ
; 653: 475-484, 2019 Feb 25.
Article
em En
| MEDLINE
| ID: mdl-30412892
ABSTRACT
The characteristics of regional environmental pollution of short- and medium-chain chlorinated paraffins (SCCPs and MCCPs) in river system from Shanghai were comprehensively investigated in this study for the first time. The total concentrations of SCCPs and MCCPs ranged from 15.0 to 1640â¯ngâ¯L-1 (median 278â¯ngâ¯L-1) and 40.3 to 3870â¯ngâ¯L-1 (median 939â¯ngâ¯L-1) in water, and from not detected (ND) to 2020â¯ngâ¯g-1 (median 89.3â¯ngâ¯g-1) and 10.1 to 10,800â¯ngâ¯g-1 (median 947â¯ngâ¯g-1) in sediments, respectively. The higher levels of SCCPs and MCCPs were found in water from Jinhui and Yexie rivers, and in sediments from Huangpu River, respectively. The concentrations of MCCPs were higher than those of SCCPs in both water and sediments, suggesting that the river system was mainly contaminated by MCCPs. Compared with other areas around the world, the concentrations of SCCPs and MCCPs were at medium to high levels in water and sediments. Factor analysis results revealed that SCCPs and MCCPs had different sources in both water and sediments. The log Koc values of CPs were significantly correlated with carbon chain lengths (pâ¯<â¯0.01), but not with chlorine number for both SCCPs and MCCPs (pâ¯>â¯0.05). A significant second-order polynomial relationship was observed between log Koc values and molecular weights of homologue groups of SCCPs (pâ¯<â¯0.001) and MCCPs (pâ¯<â¯0.01), respectively. SCCPs in water posed a low ecological risk at all sampling sites, and MCCPs in water posed a moderate ecological risk to aquatic life at nearly a fifth of sampling sites. SCCPs and MCCPs in sediments posed a low ecological risk to sediment dwelling organisms at most sampling sites.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Etiology_studies
/
Risk_factors_studies
Idioma:
En
Revista:
Sci Total Environ
Ano de publicação:
2019
Tipo de documento:
Article