| 刘丰,穆祥鹏,崔巍,白音包力皋.草海水体中多环芳烃污染特征及生态风险评价[J].农业环境科学学报,2015,34(11):2176-2182. |
| 草海水体中多环芳烃污染特征及生态风险评价 |
| Pollution Characteristics and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Water of Lake Caohai, Guizhou Province |
| 投稿时间：2015-04-20 |
| DOI：10.11654/jaes.2015.11.020 |
| 中文关键词: 草海 多环芳烃 来源解析 生态风险 |
| 英文关键词: Lake Caohai polycyclic aromatic hydrocarbons source apportionment ecological risk assessment |
| 基金项目:中国水利水电科学研究院科研专项(1468) |
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| 中文摘要: |
| 利用GC-MS测定草海水体15个样品中16种优先控制多环芳烃(PAHs)的含量,分析其组成和来源特征,并进行生态风险评价.结果表明:水体中PAHs总量的变化范围为13.40~694.93 ng·L-1,平均值为334.73 ng·L-1,高于太湖、巢湖、鄱阳湖等国控重点湖泊;草海水体中PAHs组成以2、3环为主,占PAHs总体含量的68.59%;空间分布表现为湖心区浓度最低,受附近居民影响较大的近岸区南侧浓度最高.源解析结果显示草海水体中PAHs的主要来源为煤和木材、柴薪等生物质的燃烧,主要通过生活污水排放进入草海.通过风险商值的方法对PAHs的潜在生态风险进行了评价,结果显示PAHs在12个采样点呈现低风险水平,2个中等风险,1个高风险,其中5、6环PAHs的平均风险商值占总体的64.87%. |
| 英文摘要: |
| Polycyclic aromatic hydrocarbons(PAHs) have attracted much attention because of their ubiquity, persistence, and toxicity. In order to investigate the distribution, sources and ecological risk of PAHs in surface water of Lake Caohai, water samples were collected in 15 sites in December 2012. The concentrations of 16 USEPA priority pollutant PAHs were determined by GC-MS. The composition patterns were analyzed by employing ratios of the characteristic molecular makers. The ecological risk was assessed by using the risk quotient(RQ) method as well. The total concentrations of the 16 PAHs ranged from 13.40 to 694.93 ng·L-1, with an average value as high as 334.73 ng·L-1, which was higher than that of other important lakes in China, such as Lake Taihu, Lake Chaohu and Lake Poyang. The lowest concentration was detected in the central area of the lake, while higher concentrations were found in the nearshore areas, especially in the southern nearshore area where more residents live. The PAHs in the water of Lake Caohai were predominated by 2-and 3-ring components, accounting for 68.59%. The main source of PAHs in the water was combustion of coal and biomass. Most of the sampling sites were at low or moderate(only two sites) risk level, except one site at the high risk level. |
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