From: "Osprey, James" <ospreyj**At_Symbol_Here**NOVATECH.CA>
Subject: Re: [DCHAS-L] Chloride interference in COD (ASTM1252)
Date: Sun, 10 Apr 2016 14:49:46 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: C780F80A20F17A48B72DA39F1DD0E0FA568E8BA8**At_Symbol_Here**Mail.novatech.local

You may want to contact Liquid Analytical Resource LLC at Shirley Ma. They have considerable expertise in on-line and laboratory measurement of BOD & COD. Contact is David Perrin.


James Osprey P. Eng. C. Phys

Chief Scientist

21 090 Daoust, Sainte-Anne-de-Bellevue
QC, H9X 4C7

Visitez notre site web! Visit our web site !

Tel: (514) 339-5374 ext. 208
Cell:(514) 378-9076
Fax:(514) 339-1550

From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of AbdulAziz AlRueshed
Sent: April-10-16 5:18 AM
Subject: Re: [DCHAS-L] Chloride interference in COD (ASTM1252)

We already have a COD tube from hatch company. The range of tube is from 0 to 40, 0 to 150 and from 0-1500. Still these tubes aren't working for us..

Best regards,
AbdulAziz AlRueshed
Saudi Aramco

Sent from my iPhone

On Apr 9, 2016, at 10:36 PM, Elsa Mendoza wrote:
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.
-----Original Message-----
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.

Confidentiality Warning:
This message and any attachments are intended only for the use of the intended recipient(s), are confidential, and may contain privileged information. If you are not the intended recipient, you are hereby notified that any review, retransmission, conversion to hard copy, copying, circulation or other use of this message and any attachments is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail, and delete this message and any attachments from your system. Thank you.
Information confidentielle:
Le pr̩sent message, ainsi que tout fichier qui pourrait y ̻tre joint, sont envoy̩s l'intention exclusive de son ou de ses destinataires; ils sont de nature confidentielle et peuvent constituer une information privil̩gi̩e. Nous avertissons toute personne autre que le destinataire pr̩vu que tout examen, r̩acheminement, impression, copie, distribution ou autre utilisation de ce message et de tout fichier qui y est joint est strictement interdit. Si vous n'̻tes pas le destinataire pr̩vu, veuillez en aviser imm̩diatement l'exp̩diteur par retour de courriel et supprimer ce message et tout document joint de votre syst̬me. Merci.

Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.