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February 2000

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 10 Feb 2000 09:35:10 +0200
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Mike

Not much, if you are also removing non-ionics! Can (and does) lead into a false sense of security!
As a general rule, strong ionic contamination (salts) comes off faster than non-ionic (e.g.
glycols, rosin) or weakly ionic (e.g. some carboxylic acids) because the latter a) are less soluble
and b) more inclined to form physico-chemical bonds with the substrate.

Brian

Michael Fenner wrote:

> The posts on this topic were interesting.
> For my continued education/information what does the 'net think of using conductivity checks on
> final rinse water as an instant process control parameter?
>
> Mike Fenner
>
> ----- Original Message -----
> From: Alain Savard <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, February 07, 2000 5:12 PM
> Subject: Re: [TN] Saponifier concentration measurement
>
> > Hi Lou,
> >
> > Titration will usually give you more precise results.
> >
> > There are several ways to do to use titration:
> > - Autotritration with pH/potentiometer is an excellent choice for a tight
> >        control, but is rather expensive.
> > - Manual titration with a burette and colour indicator is usually more then
> >        sufficient.
> > - Drop kit system might be appropriate if you need to verify a gross
> >        approximation on the spot, this methods can be as the operator level
> >        but is prone to error due to complexity in calibrating the size of
> > the
> >        drops.
> >
> > Just my 2 cents,
> >
> > Alain Savard, B.Sc.
> > Chemical Process Analyst
> > CAE Electronics Ltd.
> > e-mail: [log in to unmask]
> >
> > -----Original Message-----
> > From: Lou Hart
> > Subject: [TN] Saponifier concentration measurement
> >
> >
> > Technetters, how do you measure saponifier concentration in a board assembly
> > cleaning machine?  We've been using a refractometer to measure degrees Brix,
> > but this is appears to be a "legacy" method.  I've been hearing titration
> > would be the way to do it.  Please comment.  Lou Hart QA manager, Compunetix
>
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