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

Document ID

Document ID TE234

Published Date

Published Date 05/03/2018
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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+ (Product # 24158-xx), High Range (Product # 24259xx) and the Ultra-low (Product # 24158xx) COD calibrations are curves with a positive slope when zeroed on a deionized (DI) water reagent blank. The low range (Product # 24258xx) COD calibration is a curve with a negative slope when zeroed on DI water reagent blank.

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