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This document provides instructions for determining biological oxygen demand (BOD) using the modified Winkler method. It describes preparing reagents like manganese sulfate and sodium thiosulfate solutions. Standards are titrated to determine thiosulfate molarity. Unknown water samples are drawn into syringes, reagents added in steps, and dissolved oxygen measured by titrating iodine produced with standardized thiosulfate. Samples are incubated for 5 days and retested to compute BOD from initial and final d

Author

Joseph Joe

Language

EN