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Pipet 2 ml (0.2 ml for the 0-500 mg/l range) of sample into the vial. 5. Replace the vial cap tightly. Rinse the outside of the COD vial with deionized water and wipe the vial clean with towel paper. 6. Hold the vial by the cap and over a sink. Invert gently several times to mix the contents. Place the vial in the preheated COD Reactor.

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