What wavelength is appropriate for measuring COD with the dichromate method?

Document ID

Document ID TE237

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
What wavelength is appropriate for measuring COD with the dichromate method?
Summary
Wavelength for COD measurement
Answer
Hach instruments are calibrated at 350 nm for the 0-40 mg/L range, 420 nm for the 0-150 range, and 620 nm for both the 0-1,500 and 0-15,000 ranges.