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bridgette1402
16th August 2008, 04:22 PM
Hi, again, hoping for a little information.
Has anyone used this method to get the PH of the washed Biodiesel. Is It accurate?
The method is the same as performing a titration,
except you use 1ml of Bio in place of 1ml of veg oil in the Isopropyl alcohol. Can you use tumeric instead of Phenolphthalein.

Tony From West Oz
6th September 2008, 02:33 AM
Bridgette,
Biodiesel should not respond to a Titration using a caustic titration solution using a pH 8 - 9 indicator.
If you have unwashed biodiesel which still has suspended byproduct or soaps dissolved in methanol, then you can test for the presence of soaps.
In this case, you would use a 1mL/1000mL acid titration solution and bromophenol blue indicator.

better yet, wash your biodiesel to remove byproduct and/or soap.
This will ensure that any alkaline compounds (eg Soaps and byproduct) will be washed out of your biodiesel.

Regards,
Tony