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TEAA quantification
Posted: Fri Oct 07, 2005 4:28 pm
by DeadlyTedly
What is (are) the easiest, least expensive and accurate methods for quantifying TEAA concentration in aqueous and 10-50% organic solns? range 0.020-0.2 M TEAA.
Thanks
Posted: Fri Oct 07, 2005 6:09 pm
by Mark Tracy
__easy
__cheap
__accurate
Pick any two.
Posted: Fri Oct 07, 2005 6:28 pm
by DeadlyTedly
Alright, cheap and accurate.
Posted: Fri Oct 07, 2005 7:10 pm
by Mark Tracy
Titration with a pH meter is cheap, accurate and laborious. You need to do it once with acid and again with base.
If you don't mind expensive, Dionex can sell you a great ion chromatograph.
Posted: Fri Oct 07, 2005 7:36 pm
by DeadlyTedly
Can you observe an endpoint by titrating 0.02 M solution? Is there a published method that you know of? Better indicators?
We may have an ic somewhere in the company so I'll check that out. I know IC is the "right" solution, just a matter of $$ these days.
Thanks
Posted: Fri Oct 07, 2005 7:52 pm
by Mark Tracy
Don't use color indicators. Use a pH meter. Dig out your old Quantitative Analysis textbook (e.g. Skoog & West) for how to do the data analysis.
Posted: Fri Oct 07, 2005 8:32 pm
by DeadlyTedly
Strange indeed, I had the orange beast open in front of me! pH titration using 0.1 N NaOH first followed by an equivalent HCl titration. If I understand this correctly, titrate x mL of each, create a curve and join at the inflection point to read concentration.
Going to give a shot now and I'll keep you posted.