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Measuring PH Conductivity
Last Post 13 May 2012 08:05 AM by shekharsaad. 1 Replies.
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chem1guy
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Posts:1

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03 Feb 2012 05:40 AM
    I am trying to control a process with a very high NaOH content. The pH is around 13 to 13.5, and I have learned that pH probes are prone to sodium error when the measured solution is above 12. The electrode error for pH above 12 is in the order of 0.1 to 0.3 pH. The error is always low.

    My process is delivering NaOH (50%) to a tank of water. To have an error of 0.1 at a pH of 13 results in a lot of extra NaOH. Based on what I have read, it would seem that a direct pH measurement will not work. What I need is to know is the NaOH concentration in my solution. Does anyone have any experience in measuring this solution using conductivity? And is it more accurate than a pH probe?
    shekharsaad
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    Posts:37

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    13 May 2012 08:05 AM
    you need to buy other quality sensors which can measure from 0 to 14 with minimum accuracy of 0.1 then your problem get solved.
    and before buy any sensor make trial before any deal whith NaOH and other known sample bases also acids of known PH, then buy with satisfaction
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