Over a multi-year period, GLEC has conducted semi-weekly field sampling and laboratory analysis to determine the nutrient loading and associated impacts to a northern Michigan Lake from the discharge of a fish hatchery. HYDROLAB measurements and secchi disk readings are routinely performed in the field to profile temperature, dissolved oxygen, pH and water transparency. Samples are collected for the determination of the various forms of phosphorus, dissolved oxygen (Winkler titration), plankton, and occasionally other parameters such as nitrate/nitrite, total suspended and total dissolved solids, in the laboratory.
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