The Question

Date: Wed, 30 Jul 2008 12:54:06 -0400
From: Lauren Webster <Lauren@paxriverkeeper.org>
Subject: [volmonitor] Dissolved Oxygen Percent Saturation

Hi all,

I began a citizen water quality monitoring program earlier this year. The participants use basic sampling kits from LaMotte. Now that it has gotten warmer, testers are reading water temperatures above 30° Celsius. Does anyone have an easy to use table for Dissolved Oxygen Percent Saturation at temperatures above 30° Celsius?

Thanks,

Lauren Webster

Restoration Coordinator
Patuxent Riverkeeper
(301) 249-8200 ext 6
www.paxriverkeeper.org

Date: Wed, 30 Jul 2008 11:14:35 -0600
From: Claire Foster <clairelouisefoster@gmail.com>
Subject: Re: [volmonitor] Dissolved Oxygen Percent Saturation

Hi Lauren,
Water on the Web has instructions for calculating percent saturation for dissolved oxygen using a formula - you could certainly create an easy to use table that goes as high as you need it using these directions. Here's the link: http://waterontheweb.org/under/waterquality/oxygen.html

The formula itself is a little daunting, but if you paste the excel version into a spreadsheet and fill it in, it's not hard at all. If you don't want to correct for altitude, you can just enter 1 for the atmospheric pressure.

Hope that's helpful!

Claire Foster

Date: Wed, 30 Jul 2008 12:36:44 -0500
From: Chris Riggert <Chris.Riggert@mdc.mo.gov>

I created an Excel sheet that lists DO up to 15 ppm, and water temps to 39 C (makes a nice rectangular box, ha)...it also has the formula on the bottom if needed. It went over so well we ended up incorporating it into our training manuals. I would be happy to forward it to whomever wants one (can't attach things to the listserv).

Editor's note: Chris sent us two files to post online. Chris pointed out that they show basically the same thing, just in slightly different format. They follow:

DO Conversion Table (11 KB pdf file)

DO Conversion Table 2 (10 KB pdf file)

Chris

Christopher M. Riggert
Stream Team Program
Volunteer Water Quality Monitoring Coordinator
Missouri Department of Conservation
P.O. Box 180
2901 W. Truman Blvd.
Jefferson City, MO 65102-0180
Phone: (573) 522-4115 ext. 3167
Fax: (573) 526-0990
Chris.Riggert@mdc.mo.gov
www.mostreamteam.org

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