| 深圳茅洲河表层沉积物卤代多环芳烃污染研究 |
| 摘要点击 3705 全文点击 2069 投稿时间：2011-11-28 修订日期：2012-02-10 |
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| 中文关键词 卤代多环芳烃 表层沉积物 来源解析 土地利用类型 深圳市 |
| 英文关键词 halogenated polycyclic aromatic hydrocarbons(HPAHs) surface sediment source identification land use types Shenzhen |
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| 中文摘要 |
| 利用GC-MS方法分析了卤代多环芳烃(halogenated polycyclic aromatic hydrocarbons, HPAHs)在深圳茅洲河流域表层沉积物中的含量水平以及空间分布特征. 所关注的3种氯代多环芳烃(chlorinated polycyclic aromatic hydrocarbons, ClPAHs)和6种溴代多环芳烃(brominated polycyclic aromatic hydrocarbons, BrPAHs)的含量范围分别是3.00~301 ng·g-1和7.52~285 ng·g-1. 表层沉积物中HPAHs的主要污染来源包括垃圾焚烧、化石燃料的燃烧、汽车尾气以及农作物秸秆焚烧,它们所占的比例分别是40%、20.5%、11.9%和11.7%. 此外,表层沉积物中ClPAHs和BrPAHs的毒性当量(toxic equivalency quotients, TEQs)范围分别是7.95~38.1 pg·g-1和38.1~105 pg·g-1. 研究发现,HPAHs的含量与采样点周边土地利用类型有关. 随着工业用地密度的增大,表层沉积物中HPAHs的含量呈现出一个先增后减的趋势; 而表层沉积物中HPAHs的含量与农业用地密度呈反比关系. |
| 英文摘要 |
| Surface sediments collected from the Maozhou River watershed in Shenzhen were analyzed for the concentration levels and spatial distribution characteristics of halogenated polycyclic aromatic hydrocarbons (HPAHs) using GC-MS. Total concentrations of three chlorinated polycyclic aromatic hydrocarbons (ClPAHs) and six brominated polycyclic aromatic hydrocarbons (BrPAHs) of concern ranged from 3.00 to 301 ng·g-1 and 7.52 to 285 ng·g-1, respectively. Source appointments indicated that the HPAHs in these surface sediments were mainly derived from waste incineration, fossil fuel combustion, vehicle emission, and burning of crop straw, accounting for 40%, 20.5% 11.9%, and 11.7% of the total loading, respectively. Additionally, the toxic equivalency quotients (TEQ) of total ClPAHs and BrPAHs ranged from 7.95 to 38.1 pg·g-1 and 38.1 to 105 pg·g-1 respectively. Finally, the relationships between the HPAHs levels and different land use types were examined. Results indicated that the levels of HPAHs in surface sediments showed a decreasing trend after the first increase to the peak with the density of industrial land, but inversely proportional to the density of agricultural land. |
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