Palintest COD (Merc-Free) Photometer Tubetests are high-range testing tubes, designed to measure chemical oxygen demand (COD) in water samples, offering a detection range of 500 to 20,000 mg/L o2. 

These tests provide a mercury-free solution, making them safer for users and the environment. Designed for use with the Palintest photometers, these tubetests deliver fast, accurate readings that help to determine the amount of organic pollutants in wastewater, industrial effluents and environmental water sources. 

Ideal for use in water treatment plants, environmental monitoring and regulatory compliance, these tests ensure effective pollution control without the use of harmful chemicals.

Chemical oxygen demand (COD) is a vital test for assessing the quality of effluents and waste waters prior to discharge. The COD test predicts the oxygen requirement of the effluent and is used for the monitoring and control of discharges and for assessing treatment plant performance.

The standard test for COD involves digesting the sample with strong sulphuric acid solution in the presence of chromium and silver salts. These potentially hazardous chemicals clearly need to be handled with extreme care.

The Palintest COD Tubetests system offers a method which is both practical and convenient. The reagents are supplied premixed keeping potentially hazardous chemicals to a minimum. The test is simply carried out by adding the sample to the tube, closing the cap and then digesting for two hours at 150°C. The tubes are then cooled and the test colour measured using a Palintest 7100 or 7500 range of photometers

The reagent formulations are based on those specified in recognised international standard methods and meet the requirements of conformity testing against national and international standards.