Distribution and fluxes of metals in the St. Lawrence River from the outflow of Lake Ontario to Qu�bec City

1991 ◽  
Vol 53 (1) ◽  
pp. 1-19 ◽  
Author(s):  
Ken R. Lum ◽  
K. L. E. Kaiser ◽  
C. Jaskot
Keyword(s):  
Lake Ontario ◽  
St Lawrence River

Loadings of Selected Chemicals into the St. Lawrence River System from Lake Ontario, 1986/87

1989 ◽  
Vol 24 (4) ◽  
pp. 589-608 ◽  
Author(s):  
I.K. Tsanis ◽  
J. Biberhofer ◽  
C.R. Murthy ◽  
A. Sylvestre
Keyword(s):  
Mass Balance ◽  
Lake Ontario ◽  
River System ◽  
Vertical Gradient ◽  
The South ◽  
Measured Concentration ◽  
Chemical Monitoring ◽  
The North ◽  
Loading Estimates ◽  
St Lawrence River

Abstract Determination of the mass output through the St. Lawrence River outflow system is an important component in computing mass balance of chemical loadings to Lake Ontario. The total flow rate in the St. Lawrence River System at the Wolfe Island area was calculated from detailed time series current meter measurements from a network of current meters and Lagrangian drifter experiments. This flow is roughly distributed in the ratio of 55% to 45% in the South and North channel, respectively. Loading estimates of selected chemicals have been made by combining the above transport calculations with the ongoing chemical monitoring data at the St. Lawrence outflow. A vertical gradient in the concentration of some organic and inorganic chemicals was observed. The measured concentration for some of the chemicals was higher during the summer months and also is higher in the South Channel than in the North Channel of the St. Lawrence River. These loading estimates are useful not only for modelling the mass balance of chemicals in Lake Ontario but also for serving as input loadings to the St. Lawrence River system from Lake Ontario.

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.

Mercury Water−Air Exchange over the Upper St. Lawrence River and Lake Ontario

2000 ◽  
Vol 34 (15) ◽  
pp. 3069-3078 ◽  
Author(s):  
Laurier Poissant ◽  
Marc Amyot ◽  
Martin Pilote ◽  
David Lean
Keyword(s):  
Lake Ontario ◽  
St Lawrence River ◽  
Air Exchange

scholarly journals Ecology and timing of black bass spawning in Lake Ontario and the St. Lawrence River: Potential interactions with the angling season

2019 ◽  
Vol 45 (5) ◽  
pp. 949-957
Author(s):  
Bruce Tufts ◽  
Daniel McCarthy ◽  
Serena Wong ◽  
Connor Elliott ◽  
Sean Bridgeman ◽  
...  
Keyword(s):  
Lake Ontario ◽  
Black Bass ◽  
Potential Interactions ◽  
St Lawrence River

Distribution and transformation of elemental mercury in the St. Lawrence River and Lake Ontario

2000 ◽  
Vol 57 (S1) ◽  
pp. 155-163 ◽  
Author(s):  
Marc Amyot ◽  
David RS Lean ◽  
Laurier Poissant ◽  
Marie-Renée Doyon
Keyword(s):  
Water Column ◽  
Laboratory Experiments ◽  
Lake Ontario ◽  
Elemental Mercury ◽  
Volatile Species ◽  
Spatial And Temporal Patterns ◽  
First Order ◽  
Inland Lakes ◽  
First Order Kinetics ◽  
St Lawrence River

Elemental Hg (Hg0) is a volatile species that is responsible for water-to-air transfer of Hg in Lake Ontario and the St. Lawrence River. We conducted two cruises in 1998 to identify spatial and temporal patterns in Hg0 levels in these systems and performed field and laboratory experiments on redox transformations of Hg. Elemental Hg concentrations were higher in Lake Ontario than in the St. Lawrence River. At stations in Lake Ontario, Hg0 levels were higher at the bottom of the water column than at the surface, whereas they were homogeneous throughout the water column of the river. Elemental Hg concentrations were generally higher in July than in September and, in contrast with experiments on inland lakes, were relatively constant during the day except for a narrow peak at sunrise. Field and laboratory experiments showed that photoreduction of Hg(II) in St. Lawrence River water was substrate limited and was influenced by visible and ultraviolet radiation. Pseudo first-order kinetics best described photoreduction, with k values between 1 and 2·h-1.

Transport of municipal wastewater, industrial and tributary discharges in eastern Lake Ontario and upper St. Lawrence River during the ice-free period of 2006

2015 ◽  
Vol 41 (2) ◽  
pp. 549-559
Author(s):  
Shastri Paturi ◽  
Leon Boegman ◽  
Sean Watt ◽  
Yerubandi R. Rao
Keyword(s):  
Municipal Wastewater ◽  
Lake Ontario ◽  
St Lawrence River
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