This paper by John Barron, Colin Ashton and Leo Geary of Reagecon gives a comparison of Reagecon COD vials and Hach COD vials when used with the Hach DR/2010 photometer. Details on the reagents and apparatus, procedure, test samples, results, accuracy and repeatability are all given within this technical paper. Further information on Reagecon’s COD vials can be found at www.reagecon.com