Chlorinated Organic Contaminants on suspended Sediments in Lake St. Clair

1986 ◽  
Vol 21 (3) ◽  
pp. 380-389 ◽  
Author(s):  
Murray N. Charlton ◽  
Barry G. Oliver
Keyword(s):  
Bottom Sediment ◽  
Organic Contaminants ◽  
Lake Erie ◽  
Suspended Sediments ◽  
Sediment Traps ◽  
Transboundary Pollution ◽  
Suspended Material ◽  
Chlorinated Organic ◽  
Lateral Mixing ◽  
Thames River

Abstract Sediment traps were used to study the presence and fate of chlorinated organics on suspended material in Lake St. Clair. The bulk of the material caught by the traps was resuspended bottom sediment. The highest concentrations of organics were usually found in the center of the lake while the lowest concentrations were found in the southeast area near the Thames River outlet. Organic contaminants were distributed throughout the lake on suspended material. Some results suggest that lateral mixing of contaminants in the St. Clair River results in transboundary pollution. Evidence of sporadic loadings of PCB was found. Inter-contaminant ratios were fairly consistent throughout the St. Clair-Detroit system indicating eventual transport of industrial contaminants from the St. Clair River to Lake Erie.

Zebra Mussels as Biomonitors for Organic Contaminants in the Lower Great Lakes

1996 ◽  
Vol 31 (2) ◽  
pp. 411-432 ◽  
Author(s):  
Michael E. Comba ◽  
Janice L. Metcalfe-Smith ◽  
Klaus L.E. Kaiser
Keyword(s):  
Great Lakes ◽  
Organic Contaminants ◽  
Lake Erie ◽  
Soft Tissues ◽  
Lake Ontario ◽  
Dry Weight ◽  
Zebra Mussels ◽  
Organic Contamination ◽  
Contamination Levels ◽  
St Lawrence River

Abstract Zebra mussels were collected from 24 sites in Lake Erie, Lake Ontario and the St. Lawrence River between 1990 and 1992. Composite samples of whole mussels (15 sites) or soft tissues (9 sites) were analyzed for residues of organochlo-rine pesticides and PCBs to evaluate zebra mussels as biomonitors for organic contaminants. Mussels from most sites contained measurable quantities of most of the analytes. Mean concentrations were (in ng/g, whole mussel dry weight basis) 154 ΣPCB, 8.4 ΣDDT, 3.5 Σchlordane, 3.4 Σaldrin, 1.4 ΣBHC, 1.0 Σendosulfan, 0.80 mirex and 0.40 Σchlorobenzene. Concentrations varied greatly between sites, i.e., from 22 to 497 ng/g for ΣPCB and from 0.08 to 11.6 ng/g for ΣBHC, an indication that mussels are sensitive to different levels of contamination. Levels of ΣPCB and Σendosulfan were highest in mussels from the St. Lawrence River, whereas mirex was highest in those from Lake Ontario. Overall, mussels from Lake Erie were the least contaminated. These observations agree well with the spatial contaminant trends shown by other biomoni-toring programs. PCB congener class profiles in zebra mussels are also typical for nearby industrial sources, e.g., mussels below an aluminum casting plant contained 55% di-, tri- and tetrachlorobiphenyls versus 31% in those upstream. We propose the use of zebra mussels as biomonitors of organic contamination in the Great Lakes.

Treatment of chlorinated organic contaminants with nanoscale bimetallic particles

1998 ◽  
Vol 40 (4) ◽  
pp. 387-395 ◽  
Author(s):  
Wei-xian Zhang ◽  
Chuan-Bao Wang ◽  
Hsing-Lung Lien
Keyword(s):  
Organic Contaminants ◽  
Bimetallic Particles ◽  
Chlorinated Organic

Chlorinated Organic Contaminants from Mechanical Wood Processing and Their Bioremediation

2005 ◽  
pp. 421-442 ◽  
Author(s):  
M. Minna Laine ◽  
Minna K. MäNnistö ◽  
Mirja S. Salkinoja-Salonen ◽  
Jaakko A. Puhakka
Keyword(s):  
Organic Contaminants ◽  
Wood Processing ◽  
Chlorinated Organic

Inshore–Offshore Sedimentation Differences Resulting from Resuspension in the Eastern Basin of Lake Erie

1982 ◽  
Vol 39 (5) ◽  
pp. 748-759 ◽  
Author(s):  
J. Bloesch
Keyword(s):  
Lake Erie ◽  
Sediment Cores ◽  
Dry Weight ◽  
Sediment Traps ◽  
Particulate Phosphorus ◽  
Particulate Nitrogen ◽  
Eastern Basin ◽  
Fine Grained ◽  
Lake Bottom ◽  
Offshore Station

From June through October 1978 sediment traps were moored at three stations in an inshore–offshore transect in the Eastern Basin of Lake Erie. Settling fluxes measured with the traps exposed close to lake bottom were rather similar at all three stations during summer stratification, averaging 6.1 g∙m−2∙d−1 for dry weight, 293 mg∙m−2∙d−1 for particulate organic carbon (POC), 38 mg∙m−2∙d−1 for particulate nitrogen (PN), and 5.44 mg∙m−2∙d−1 for particulate phosphorus (PP). A comparison of the hypolimnetic traps with the epilimnetic traps at the offshore station indicated that considerable resuspension takes place even in summer. During fall, however, the nearshore sedimentation rates were markedly increased because of storm-induced bottom resuspension. By comparing the trap catches with sediment cores taken at all three stations, a resuspension model for dry weight, POC, and PN was developed. The calculations showed that newly formed organic material is resuspended and redeposited more frequently at nearshore locations than offshore. This repeated nearshore resuspension enhances decomposition of detritus, as shown by low relative phytoplankton activity in the hypolimnetic traps, and results in horizontal transport of fine-grained organic matter in the offshore direction. The significant POC and PN concentration differences found in the inshore–offshore transect of the bottom sediments can be explained by these two processes.Key words: sedimentation, sediment traps, sediment cores, resuspension, inshore–offshore differences

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