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Unread 11/05/2009, 08:26 AM   #3
Randy Holmes-Farley
Reef Chemist
 
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Join Date: Apr 2001
Location: Arlington, Massachusetts
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Just as a follow up, the iron in GFO (Fe+++) becomes more and more soluble as the pH rises from pH 8 to higher values. 1 M NaOH is about pH 14. At that pH, the amount of iron that dissolves (as Fe(OH)4- ) is just under 0.1 mM (about 5 ppm). So you will be dissolving away some of the surface. That may be beneficial for this process.


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