pH change by N2 (nitrogen purging)

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pH change by N2 (nitrogen purging)

Postby mj.mirazimi on May 2nd, 2017, 2:05 pm 

Hi all,

I have purged some nitrogen gas into my DI water to remove oxygen from the leaching environment. However, the pH changed and increased to around 8.9!! I have repeated several times and got the same results.
Is there any reaction between water and N2 that can produce bases such as NH3 or .... or by purging N2, I just removed both CO2 (as an acidic agent) and O2 and this is the reason of the increase in pH?!

Thanks for your help,
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Re: pH change by N2 (nitrogen purging)

Postby BioWizard on May 6th, 2017, 8:13 pm 

My first thought was that you probably removed CO2 and that caused the pH to rise a little. Though I don't think that would be enough to raise it past say 7.2. N2 is inert and should'nt produce NH3 under those conditions. Maybe your N2 gas has some other stuff in it.
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Re: pH change by N2 (nitrogen purging)

Postby BioWizard on May 6th, 2017, 8:25 pm 

Or alternatively your "DI" water contained some basic agent that was being buffer by some CO2?
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