5.28 Measuring water quality. Biochemical oxygel organic pollutants in water by measuring the amount of oxygen consumed by microorganisms carbon (TOC) is easy to measure, so it is common to measure TOC and use regres- that break down these compounds. BOD is hard to measure accurately. Total municipal sion to predict BOD. A typical regression equation for water entering a treatment plant is ¹1 BOD=-55.43 +1.507 TOC Both BOD and TOC are measured in milligrams per liter of water.

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