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Chemical Oxygen Demand (COD) analysis 1. Filter sample using syringe filter 2. Dilute if the sample is too polluted (use the basic dilution method) 3. Pipette the diluted sample into COD vial 4. Place the vial in the reactor for reaction to take place 5. Finally, read COD reading using spectrophotometer #wastewateranalysis #codanalysis #research
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