The Jialu River, an important branch of the Huaihe River in China, was seriously polluted because of rapid economic growth and urbanization. In order to evaluate the potential for serious environmental consequences as a result of anthropogenic contamination, the distribution of @entity2555 ( @entity2556 ) has been investigated in surface sediment samples collected in connection with field surveys of 19 sites along the Jialu River. The total concentration of the 16 USEPA priority @entity2556 ranged from 466.0 to 2605.6 ng/g dry weight with a mean concentration of 1363.2 ng/g. Sediment samples with the highest @entity2556 concentrations were from the upper reaches of the river, where Zhengzhou City is located; the @entity2556 levels in the middle and lower reaches were relatively low. According to the observed molecular indices, @entity2556 originated largely from the high-temperature pyrolytic process. According to the numerical effect-based sediment quality guidelines (SQGs) of the United States, the levels of @entity2556 in the Jialu River should not exert adverse biological effects. The total @entity3014 @entity137 equivalent (TEQ) values calculated for samples varied from 50.4 to 312.8 ng/g dry weight with an average of 167.4 ng/g. The relationships between @entity2556 and environmental factors, including chemical properties of sediments, water quality, aquatic organisms, hydrological conditions, and anthropogenic activities, are also discussed. @entity2556 exerted a potential negative impact on the benthos. Settlement percentage, population density and industrial GDP per capita had a significant influence on the distribution of @entity2556 .

XXXX in surface sediments of the Jialu River.

@entity2556 :: ('CHEBI:33848', 'Chemical') :: ['PAHs', 'PAH'] @entity137 :: ('MESH:D064420', 'Disease') :: ['toxicity'] @entity3014 :: ('MESH:D001564', 'Chemical') :: ['benzo[a]pyrene'] @entity2555 :: ('MESH:D011084', 'Chemical') :: ['polycyclic aromatic hydrocarbons']
@entity2555 :: (MESH:D011084,Chemical) :: ['Polycyclic aromatic hydrocarbons']
