Simply aliquot 2 ml of sample directly to the prefilled COD digestion tube, replace the screw cap, and mix by inverting the tube. Place the digestion tubes in the DigiPREP CUBE, or the Automated EasyPREP COD-200, set to 150 °C. Heat for 2 hours, allow samples to cool, then measure in a spectrophotometer at the appropriate wavelength.
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