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NANOCOLOR® COD 160 Photometric determination of the COD Photometric determination of decrease in chromate concentration after two hours and oxidation with potassium dichromate/sulphuric acid/silver sulphate at 148 °C This test is in accordance to the DIN ISO 15705:2003. The chemical oxygen demand of a water is determined by silver-catalysed oxidation with potassium dichromate/sulphuric acid at 148 °C during a two hour period. Data and ordering information Cat. No. 985 026 Type tube test 0-26 Range 15 – 160 mg/l O2 Sufficient for 20 determinations Shelf life at least 1 year at 15 – 25 °C Sea water suitability no This test is suitable for short time COD at 160°C within 30 minutes. In contrast to the conditions described in the ISO 15705, the short time COD is characterised by a higher digestion temperature and reduced reaction time. Therefore we recommend to compare the results of the short time COD from time to time with measurements made under the conditions of ISO 15705 (150 ± 5°C / 2h ± 10 min).
