Hach's USEPA-approved dichromate COD Method is the most widely used chemical oxygen demand (COD) method for NPDES reporting in the world.
Hach offers complete systems for chemical oxygen demand (COD) analysis, with prepared COD reagents, a reactor, and spectrophotometers and.
Zhejiang Aijiren,Inc. is one of the leading China COD vials manufacturers and suppliers, welcome to wholesale cheap COD vials from us.