Abstract
Weihe River is a typical river located in the arid and semi-arid regions of Northwest China. In this study, the distribution and sources of 16 polycyclic aromatic hydrocarbons (PAHs) in Weihe River were investigated. The concentrations of ∑PAHs ranged from 351 to 4427 ng/L with a mean value of 835.4 ng/L in water dissolved phase (WDP), from 3557 ng/L to 147,907 ng/L with a mean value of 20,780 ng /L in suspended particulate matter (SPM), and from 362 to 15,667 ng/g dry weight (dw) with a mean value of 2000 ng/g dw in sediment, respectively. The concentrations of PAHs in Weihe River were higher compared with other rivers in the world. In both WDP and sediment, the highest concentrations of ∑PAHs were observed in the middle reach, while the lowest concentrations of ∑PAHs were found in the lower reach. For SPM, however, the PAHs concentrations in the lower reach were highest and the PAHs concentrations in the upper reach were lowest. The ratios of anthracene/(anthracene + phenanthrene) and fluoranthene/(fluoranthene + pyrene) reflected a pattern of both pyrolytic and petrogenic input of PAHs in Weihe River. The potential ecosystem risk assessment indicated that harmful biological impairments occur frequently in Weihe River.
Highlights
Polycyclic aromatic hydrocarbons (PAHs) are a class of diverse organic compounds containing two or more fused aromatic rings of carbon and hydrogen atoms
The compositional profiles of polycyclic aromatic hydrocarbons (PAHs) in the dissolved phase are illustrated in Figure 2, which indicates that low molecular weight PAHs (2- and 3-ring PAHs) were abundant in samples, representing on average over 54% of all PAHs
The results obtained in this study showed that concentrations of total and individual PAHs in water dissolved phase (WDP), suspended particulate matter (SPM) and sediment varied significantly among sampling locations
Summary
Polycyclic aromatic hydrocarbons (PAHs) are a class of diverse organic compounds containing two or more fused aromatic rings of carbon and hydrogen atoms. PAHs are ubiquitous contaminants in the environment These compounds are generally generated by natural and anthropogenic processes and can be introduced into the environment through various routes. PAHs are of environmental concern due to their toxic, mutagenic and carcinogenic potential [1]. Seven PAHs were designated as potentially carcinogenic pollutants by the US EPA. For these reasons, PAHs’ behavior, transport, fate and environmental risk to ecological systems have become an advanced research hotspot in environmental fields all over the world [2,3,4,5,6,7,8,9]
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