How do the wavelengths vary for each of the COD reagents?

Document ID

Document ID TE234

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
How do the wavelengths vary for each of the COD reagents?
Summary
COD calibration curves
Answer
The COD calibration curves for Hach procedures vary. The High Range+ (Catalog Number/Order Code 24158-xx), High Range (Catalog Number/Order Code 24259xx) and the Ultra-low (Catalog Number/Order Code 24158xx) COD calibrations are curves with a positive slope when zeroed on a deionized (DI) water reagent blank. The low range (Catalog Number/Order Code 24258xx) COD calibration is a curve with a negative slope when zeroed on DI a water reagent blank.