ABOUT US We are a research and development company working on chemical test reagents. After 3 years of careful and detailed research job by our professionals, our first test kit; Chemical Oxygen Demand is on the market since 2003 and is being used by consumers. MATRİKS KIMYA LTD is the only manufacturer of Chemical Oxygen Demand (COD) test kits in Turkey and the Middle East. Chemical Oxygen Demand test kits (reagents) are used in water and wastewater laboratories. Our COD test kits are compatible with most photometers and spectrophotometers. We are doing research & development for other water and wastewater test reagents. They will be available as soon an r&d job has been finished.