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September 2003

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 24 Sep 2003 12:10:52 -0700
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        Now that is all clear to some, some of us are all confused. Titrate
on not titrate.
        Ramon


> -----Original Message-----
> From: Rudy Sedlak [SMTP:[log in to unmask]]
> Sent: Wednesday, September 24, 2003 10:42 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Saponifier Concentration
>
> Suppliers are often wrong about their own products...and merely mirror the
> advice that the customers are used to receiving....
>
> Yes, pH is virtually worthless when determining the concentration when the
> cleaner is new....
>
> So, when new, and ONLY when new, is titration a good control method....
>
> However, as the solution becomes used, the MEA is consumed by reacting
> with soils and Carbon Dioxide from the air...yet, it will still titrate,
> not fully and completely, but it still registers as a source of alkali
> during titration, thus titrating and giving a "false positive"...and thus
> giving an artificially high reading...
>
> Tell me how well a very old, very used solution of saponifier cleans even
> when it titrates as "full strength", as compared to a new solution?   I
> use this example as clear proof of the inaccuracy of the titration
> method....yet, a solution of known strength of make up, always cleans the
> same at the same pH.... making pH the more accurate method of determining
> cleaning activity...
>
> Since both Brian and I are clearly obvious experts...in spite of the fact
> that Brian recommended titrating with Stearic acid, which is soluble only
> in alcohol, making the titrant volatile, and thus difficult to keep
> constant in strength, the clear way to deal with this, is to both titrate,
> especially when new, and do a pH.
>
> Good luck.
>
> Rudy Sedlak
> RD Chemical Company
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