Spatial variation of polycyclic aromatic hydrocarbons (PAHs) in surface sediments from rivers in hilly regions of Southern China in the wet and dry seasons
Spatial variation of polycyclic aromatic hydrocarbons (PAHs) in surface sediments from rivers in hilly regions of Southern China in the wet and dry seasons
复制标题
南方丘陵地区河流表层沉积物中多环芳烃(PAHs)干湿季空间变化
DOI：
10.1016/j.ecoenv.2018.03.004
复制
发表时间：
2018-07-30
影响因子：
6.8
通讯作者：
Deng, Zhiyi
中科院分区：
文献类型：
--
作者：
Gong, Xionghu;Xiao, Liping;Deng, Zhiyi
研究了中国南方丘陵区13条河流表层沉积物中多环芳烃（PAHs）的季节变化特征。多环芳烃的浓度分析在雨季高于旱季的分析，与残留量范围从74.3至1930.9纳克克（-1）干重在雨季和96.9至1388.9纳克克（-1）干重在旱季。主要贡献者是3环和4环同系物，在雨季和旱季分别占已鉴定多环芳烃的59.8% +/- 10.1%和58.3% +/- 9.3%。多环芳烃污染源的近源性和易受大气沉积物输入影响的位置导致多环芳烃的高浓度。诊断比值表明，不同季节的多环芳烃污染源无明显差异。此外，主成分分析和多元线性回归（PCA-MLR）研究表明，汽车排放和煤炭燃烧等燃烧源是多环芳烃的主要来源。基于毒性当量（TEQ）的毒理学风险评价结果表明，苯并[a，h]蒽、苯并[n]蒽和二苯并[a，h]蒽在该地区具有较高的生态风险。
Seasonal variations of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments from 13 rivers in hilly regions of southern China were studied. Concentrations of PAHs analyzed in the wet season were higher than those analyzed in the dry season, with residues ranging from 74.3 to 1930.9 ng g(-1) dw in the wet season and from 96.9 to 1388.9 ng g(-1) dw in the dry season. The primary contributors were 3- and 4-ringed congeners accounting for 59.8% +/- 10.1% and 58.3% +/- 9.3% of the identified PAHs in the wet and the dry seasons, respectively. Proximity to sources and locations susceptible to high atmospheric depositional inputs results in high concentrations of PAIL Diagnostic ratios have indicated that the sources of PAHs in different seasons make no apparent difference. Furthermore, a principal component analysis and multiple linear regression (PCA-MLR) studies indicate that combustion sources such as vehicle emissions and coal combustion are the primary sources of PAHs. Toxicological risk assessments based on TEQ(care) suggested that Benzo[alpyrene, benz[n]anthracene, dibenz[a,h]anthracene could pose high ecological risks in this area.