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Place Approximately 500ml Of Sample In a clean blender bowl and homogenizze at high speed for two minutes. blending the sample ensures a auniforum distribution of suspended solids and thus improves the accuracy of test results.
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Pre heat the COD reaction to Iso c
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Carefully remove the cap of COD digestion Reagent vial.
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While holding The vial at a 45 degree angle carefully pipet 2 ml sample into the vial.
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Replace and tighten the cap.
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Holding the vial by the cap in an empty sink, gently invert several times to mix the contents they will become very hot during mixing.
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Place the vial in prehented COD reacton.
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Prepare a reagent blank by repeating step 3 through 6, substituting2 ml of distilled water in place of sample.
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Incubate the vial for two hours at size.
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Turn off the reaction off and alllow the vials to cool to 120 degree and less. invert each vial several times while still warm place vial in a cooling reach and allow them to room temp.
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Measure the COD using spetrcophotamctrum method.