| 长江武汉段不同粒径沉积物中多环芳烃（PAHs）分布特征 |
| 摘要点击 2239 全文点击 1256 投稿时间：2006-08-17 修订日期：2006-11-27 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 长江 多环芳烃（PAHs） 沉积物 粒径 分布 |
| 英文关键词 Yangtze River polycyclic aromatic hydrocarbons (PAHs) sediment grain size distribution |
|
| 中文摘要 |
| 将采自长江武汉段的沉积物湿筛分成5个粒径的组分（>200 μm，200～125 μm，125～63 μm，63～25 μm，<25 μm），分别测定其中多环芳烃(PAHs)的含量.结果表明，不同粒径沉积物中PAHs组成基本相同，均以3环以上PAHs为主，但是∑PAHs浓度相差很大，范围为26.1～7 135.9 ng/g.其中，>200 μm沉积物中∑PAHs浓度最高，为7 135.9 ng/g；63～25 μm沉积物中∑PAHs浓度最低，为26.1 ng/g.占沉积物38.6%质量分数的<25 μm沉积物富集了沉积物中约75%的∑PAHs.总有机碳是影响PAHs在不同粒径沉积物中分布的主要因素，不同粒径沉积物中PAHs与总有机碳呈显著正相关（p<0.01）.此外，有机质类型、结构也是影响PAHs在不同粒径沉积物中分布的重要因素. |
| 英文摘要 |
| Sediments collected from Yangtze River were separated into five size fractions (>200 μm，200～125 μm，125～63 μm，63～25 μm，<25 μm) by wet sieving. The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) listed as U.S. EPA priority pollutants were determined in the fractionated sediments. ∑PAHs concentrations ranged from 26.1 to 7 135.9 ng/g and varied largely among the different size fractions. The highest ∑PAHs concentration (7 135.9 ng/g) was associated with the largest size fraction (>200 μm) while the fine silt fraction (63～25 μm) contained the lowest ∑PAHs concentration, 26.1 ng/g. Although the PAHs concentrations difference among different fractions was great, the composition of PAHs in the five size fractions showed similar pattern dominated by PAHs with three or more rings. Sediment particles less than 25 μm contributed 75% of the ∑PAHs, while comprising 38.6% of bulk sediment dry weight. A significant positive correlation (p<0.01) between PAHs and total organic carbon (TOC) existing for all size fractions demonstrated that TOC was important for PAHs distribution in sediments. Additionally, sediment organic matter type and structure also played an important role in PAHs distribution in different grain size fractions. |
