Sources appointment and ecological risk assessment of polycyclic aromatic hydrocarbons (PAHs) in sediments of Erhai Lake, a low-latitude and high-altitude lake in southwest China
- 393 Downloads
Sixteen polycyclic aromatic hydrocarbons (PAHs) were analyzed from the surficial sediments in Erhai Lake, a plateau lake in China. The results showed that except for acenaphthylene (Ace) Ace and Dibenz(a,h)anthracene (DBA), the central region contained individual PAHs at concentrations lower than those in other lake regions. Total concentration of the PAHs (ΣPAHs) in the sediments from Erhai Lake ranged from 32.42 to 558.53 mg/kg with a mean value of 256.70 mg/kg. The maximum value of ΣPAHs was observed in the north region of the lake and more than 10-fold higher than the minimum values. Moreover, high molecular weight (HMW) PAHs, especially 5-ring PAHs, accounted for higher ratios up to 76 % relative to other PAHs compound in almost all sampling sites. Molecular diagnostic ratios including anthtacene (Ant)/(Ant + phenanthrene (Phe)), fluoranthene (Flt)/(Flt + pyrene (Pyr)), benz(a)anthracene (BaA)/(BaA + chrysene (Chr)), and indeno(1,2,3-cd)pyrene (IPY)/(IPY + benz(g,h,i)perylene (BPE)) were recorded at all sampling sites and indicated that the origin of PAHs in Erhai Lake was predominately pyrolytic. Furthermore, principal component analysis with component dominating by HMW PAHs showed that combustion origins were the primary contamination sources of PAHs in the sediments of Erhai Lake. Finally, ecological risk assessment indicated that the sediments from Erhai Lake are exposed to potential low risk for ΣPAHs, and the ecological risk decreases in the order of northern region > southern region > central region.
KeywordsPolycyclic aromatic hydrocarbons (PAHs) Sources appointment Ecological risk assessment Sediment Erhai Lake
This work was funded by National Basic Technological Research of China (2014FY110400), National Natural Science Foundation of China (no. 41271214), A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and State Key Laboratory of Lake Science and Environment (2014SKL014).
- Bakhtiari AR, Zakaria MP, Yaziz MI, Lajis MNH, Bi XH, Rahim MCA (2009) Vertical distribution and source identification of polycyclic aromatic hydrocarbons in anoxic sediment cores of Chini Lake, Malaysia: perylene as indicator of land plant-derived hydrocarbons. Appl Geochem 24:1777–1787CrossRefGoogle Scholar
- Martins CC, Bícego MC, Rose NL, Taniguchi S, Lourenço RA, Figueira RC, Mahiques MM, Montone RC (2010) Historical record of polycyclic aromatic hydrocarbons (PAHs) and spheroidal carbonaceous particles (SCPs) in marine sediment cores from Admiralty Bay, King George Island, Antarctica. Environ Pollut 158:192–200CrossRefGoogle Scholar
- Nakata H, Uehara K, Goto Y, Fukumura M, Shimasaki H, Takikawa K, Miyawaki T (2014) Polycyclic aromatic hydrocarbons in oysters and sediments from the Yatsushiro Sea, Japan: comparison of potential risks among PAHs, dioxins and dioxin-like compounds in benthic organisms. Ecotox Environ Safe 99:61–68CrossRefGoogle Scholar
- Sereshk ZH, Bakhtiari A (2014) Distribution patterns of PAHs in different tissues of annulated sea snake (Hydrophis cyanocinctus) and short sea snake (Lapemis curtus) from the Hara Protected Area on the North Coast of the Persian Gulf, Iran. Ecotoxicology and Environmental Safety 109:116–123CrossRefGoogle Scholar