POLYCYCLIC AROMATIC-HYDROCARBONS IN DATED SEDIMENTS FROM GREEN BAY AND LAKE-MICHIGAN

被引:16
|
作者
ZHANG, XC
CHRISTENSEN, ER
GIN, MF
机构
[1] UNIV WISCONSIN,DEPT CIVIL ENGN & MECH,MILWAUKEE,WI 53201
[2] UNIV WISCONSIN,CTR GREAT LAKES STUDIES,MILWAUKEE,WI 53201
来源
ESTUARIES | 1993年 / 16卷 / 3B期
关键词
D O I
10.2307/1352801
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sediment cores from two locations in Green Bay and two in lake Michigan were analyzed for 12 polycyclic aromatic hydrocarbons (PAHs), loss-on-ignition (LOI), Pb-210, Cs-137, and Be-7 to study differences in deposition patterns between the freshwater estuary Green Bay, with several local sources, and the open Lake Michigan, dominated by atmospheric inputs. We found that the remote sites receive relatively less high-molecular weight PAHs such as ideno(1,2,3-cd)pyrene and dibenz(ah)anthracene and are more depleted in anthracene and pyrene. This may be related to a low Henry's law constant for the high molecular compounds and to selective photooxidation of anthracene and pyrene during transport. While sedimentation rates are higher in Green Bay than in the open lake, the PAH levels are generally comparable (0.3-8.5 mug g-1) in the two areas. However, the highest PAH levels are found in a core from Green Bay (GB88G). The two Green Bay cores have total PAH concentration maxima in 1985, which appear to be related to the combustion of petroleum. Also, one Green Bay core (GB88G) and the two from Lake Michigan exhibit PAH maxima in the early 1950s in agreement with observations from other study areas. There is a significant correlation between total PAH and LOI, and thus total organic carbon, for the Green Bay cores, but little or no such correlation for the Lake Michigan cores. This may indicate that PAHs in Green Bay are effectively scavenged by settling detritus.
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页码:638 / 652
页数:15
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