滴水湖水系沉积物中多环芳烃的分布及风险评价

2012年,每两个月采集一次上海人工滩涂湖泊——滴水湖水系表层沉积物,检测16种多环芳烃(PAHs)含量.结果表明,滴水湖水系∑PAHs变化范围为74.03~579.20ng/g,平均值为272.55ng/g.其中,闸外引水河(407.64±6.90)ng/g]≈闸内引水河(427.99±213.84)ng/g]>滴水湖(156.33±62.00)ng/g].研究区各点蒽/(蒽+菲)比值均大于0.1,说明PAHs主要来自于石油燃烧源.生态风险评价表明,滴水湖水系沉积物PAHs不存在严重的生态风险,但闸外和闸内引水河沉积物PAHs存在较低几率的潜在风险,湖区沉积物PAHs则无潜在风险.

Distribution and ecological risk assessment of polycyclic aromatic hydrocarbons in sediments from Dishui Lake water system

Dishui Lake is the largest artificial lake in China. 16polycyclic aromatic hydrocarbons (PAHs) were measured in sediments from Dishui Lake water system every two months in 2012. The ∑PAHs concentrations ranged from 74.03to 579.20ng/g, with the mean of 272.55ng/g. ∑PAHs in river sediment outside the diversion sluice (407.64±6.90) ng/g] were similar to sediment inside the diversion sluice (427.99±213.84) ng/g], while both were greater than those in Dishui Lake (156.33±62.00)ng/g]. As the value of Ant/(Ant+Phe) in each site of study area was higher than 0.1, petroleum combustion was considered to be the main sources of PAHs. The result of ecological risk assessment indicated that serious ecological risk didn￠t exist, but the flowing rivers maybe had a weak potential risk, while Dishui lake was considered risk-free.