You may want to also try:
Aqua Diagnostic PeCOD System
They claim their system is good up to 35000 mg/L Cl
There are several papers out of China from the Mid 2000's on the topic also.
You can find the method in the "Standard Methods for the Examination of Water and Wastewater" 22ND Edition from the Water Environment Association. This is the reference manual for us, water and wastewater laboratory analysts. In the lab we have been used already prepared test tubes from HATCH. They come for the low level or High level range COD determinations. You can contact this company too.
From: AbdulAziz AlRueshed
Sent: Apr 8, 2016 12:01 PM
Subject: [DCHAS-L] Chloride interference in COD (ASTM1252)
Good night Gentlemen,
In our lab we are following the ASTM method D1252-88, Standard Test Methods for Chemical Oxygen Demand in wastewater and seawater. The problem is the concentration of the chloride in seawater which reach around 35000 mg/l. This high chloride value interfere with the colorimetric method. We tried Correlate with TOC value but unfortunately the TOC value is very low. Is there any other way to determine the COD in the high chloride samples.
Please note the COD is low so we can't dilute the samples.
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