"During the period April to November 1980, six surveillance cruises- were conducted on Lake Huron, the North Channel and Georgian Bay, sampling 138 stations for physical, chemical and biological variables"--Abstract.

"The construction and operation of two large-sample extractors onboard the CSS Limnos are described. They were used to extract water samples of approximately 50-L volume with dichloromethane during the monitoring cruises on lakes Erie, Huron, Ontario and Superior in early 1986. Both whole water and clarified water were extracted. The dichloromethane extracts were later analyzed for organochlorines, chlorobenzenes, polychlorinated biphenyls, and polynuclear aromatics by the National Water Quality Laboratory in Burlington, Ontario. A solution containing surrogate standards was continuously added at a fixed rate to the water being extracted. The recoveries of these surrogates provide a continuous measure of the extraction efficiency and reproducibility of the analytical process, and confirm that the processes used are valid"--Abstract, p. v.

"Water samples were collected from Lake Ontario during April and November, filtered (0.45 æm) and immediately analyzed onboard ship for the nutrients soluble reactive phosphorus, nitrate plus nitrite, and ammonia. Replicates were stored in glass bottles at 4°C and reanalyzed within eight days. Statistical analysis showed that soluble reactive phosphorus decreased by 11% and 13% and nitrate plus nitrite by 7% and 6%, whereas ammonia increased by 75% on one cruise and decreased by 37% on the other"--Abstract, p. v

The Canada Centre for Inland Waters carries out annual surveys on Lake Ontario to monitor the levels of various physical, chemical and biological parameters. In 1979, three synoptic trace metal cruises were conducted, during both isothermal and stratified conditions. The current study employed revised analytical techniques to measure total metal concentrations and thus identify indices of noncompliance with water quality objectives.

"According to the Great Lakes International Surveillance Programme designed by the International Joint Commission, 1981 and 1982 are scheduled as intensive years for Lake Ontario. Since 1968 annual cruises have been conducted on Lake Ontario by the federal Department of the Environment's research centre, the Canada Centre for Inland Waters, to measure a variety of physical, chemical and biological parameters. The present report identifies the station locations, sampling frequency and parameter lists for the large lake cruises conducted between 1968 and 1980 in support of the Surveillance Programme. Whole lake 1 m volume weighted values for temperature, dissolved oxygen, specific conductance, total phosphorus, soluble reactive phosphorus, nitrate plus nitrite, ammonia, soluble reactive silica, and corrected chlorophyll a are given by cruise for the years 1968 to 1980"--Abstract, p. vii.