LCK1814 COD Cuvette Test, 7-70 mg/L O₂

LCK1814 Cuvette test (13mm) measures COD in the range of 7-70 mg/L O₂ in chloride-containing waste water, sea water and other liquids. The product uses dichromate method (ISO 6060-1989, DIN 38409-H41-H44). Article LCK1814 can be used for 25 tests. LCK reagent kit can be evaluated on DR3900, DR6000 and DR1900.

Shake the cuvette and pipet 1.8 mL of sample. Close, shake vigorously and heat the cuvette for 2 hours at 148 °C (298.4 °F) in the classic thermostat or using standard program HT for 15 minutes in the high temperature thermoreactor. Cool the cuvette to room temperature and perform sample analysis using one of the abovementioned spectrophotometers. Oxidizable substances react with sulphuric acid and potassium dichromate solution in the presence of silver sulphate as reaction catalyst. Mercury sulphate masks chloride. The yellow color reduction of Cr6+ is measured. The method may be used for water samples (or diluted water samples) with chloride concentrations of 1.0-20 g/L. It is recommended to use LCK1414 Cuvette test for lower chloride concentration.

The short-term conservation temperature is between 2 °C and 5 °C. The long-term conservation temperature is -18 °C. The waste water, sea water and other liquid sample must be transported and kept in the glass or polyethylene vessel. LCK1814 storage conditions are between 15 °C and 25 °C protected from light.