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December 1998

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Subject:
From:
Paul Wilson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 1 Dec 1998 06:32:13 -0500
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Lei Tumibay,

The representation of units in terms of micrograms NaCl / sq cm is by convention only.
If one is interested in the sum of results of these ions expressed in these units, then

ppm F X (59/19) X 1000 = fluoride expressed as micrograms NaCl / sq cm
ppm Br X (59/80) X 1000 = fluoride expressed as micrograms NaCl / sq cm
ppm Cl X (59/36) X 1000 = fluoride expressed as micrograms NaCl / sq cm
ppm I X (59/127) X 1000 = fluoride expressed as micrograms NaCl / sq cm
ppm SO4 X (59/96) X 1000 = fluoride expressed as micrograms NaCl / sq cm

ppm etc X (59 / gram equivalent weight of etc) X1000 = etc expressed as micrograms NaCl / sq cm

The SUM of the results = all anions expressed as micrograms NaCl / sq cm

                        Paul Wilson
        R&D Manager / Plant Chemist

                   Circuit Center, Inc.
                 4738 Gateway Circle
                  Dayton, OH 45440

          Phone (937) 435-2131     Fax (937) 435-7698
            http://www.circuitcenter.com


-----Original Message-----
From:   Tumibay, Aleli [SMTP:[log in to unmask]]
Sent:   Monday, November 30, 1998 10:43 PM
To:     [log in to unmask]
Subject:        [TN] Q on Ion Chromatography

For the IC experts out there, I have questions for you:
        Our specs specify that "Package contamination" values be expressed in
ug NaCl equivalent / sq cm.   However,  the Ion Chromatography results that we
obtained are specific, itemized (i.e. Fl, Br, I, Cl, SO4, etc) and in ppm.
        1. What "anions" in the IC results are considered "NaCl equivalent"? (Do
I add all of the anions or is it just the Cl- ions?)
        2. If the total surface area of the unit and the IC solvent volume were
known, I can readily convert the IC results (ppm or mg/L) to ug/cm sq.  Am I
doing it right?  Or are these units not related to each other and therefore not
convertible?
Would appreciate all your responses.

Thanks,

Lei Tumibay
Lead Finish Group - Assembly Engineering
Analog Devices - General Trias
Cavite, Philippines
E-mail: [log in to unmask]
http://www.analog.com

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