LCK614 COD Cuvette Test, 50-300 mg/L O₂

LCK614 Reagent Set measures COD in the range of 50-300 mg/L O₂ in wastewater and process analysis. LCK Cuvette Test uses dichromate method (ISO 6060-1989, DIN 38409-H41-H44). Article LCK614 can be used for 25 tests. 13mm LCK Cuvette Test may be evaluated on DR3900, DR6000, DR1900, DR2800, DR3800 and DR5000.

Bring the thermostat to 148 °C (298.4 °F) and heat cuvettes with water sample and reagent in the classic thermostat for 2 hours at 148 °C (298.4 °F) or in high temperature thermostat HT 200 S for 15 minutes using standard program HT. After that cool cuvettes to room temperature in a cooling rack or in the HT 200 S thermostat. Finally insert the cuvette in the one of the above mentioned thermoreactors. Oxidizable substances are reacting with sulphuric acid and potassium dichromate solution in the presence of silver sulphate as reaction catalyst. Chloride is masked by mercury sulphate. The decrease in the Cr6+ yellow coloration must be evaluated. The maximum chloride concentration for samples (or diluted samples) is up to 1500 mg/L. Large excess of the chemical oxygen demand may cause result displays within the measuring range.

24 hour conservation of water samples containing COD require temperature between +2 °C and +5 °C and 14 days of conservation require temperature of -18 °C. The sampling vessel material should be either glass or polyethylene (PE). LCK614 Cuvette Test temperature conditions are between 15 °C and 25 °C.