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GLUCONIC ACID Gluconic acid is a material that has proven to be an extremely effective iron sequestrate. Unlike other effective sequestrants such as AMP and HEDP, gluconic acid does not contain any phosphorus and therefore can not contribute any orthophosphate to the cooling water system. The extreme insolubility of ferric hydroxide is the reason that iron control in a cooling system becomes difficult as pH increases. However, gluconic acid and its salts, because of their high chelate-stable complexes, have been found to be very cost-effective in the alkaline range up to a pH of 9.0. Values of the metal/chelate stability complex for gluconic acid, as compared to other materials, is shown below
In general terms, the higher stability constant for gluconic acid indicates a greater complexing capability, although the actual performance of any cheating agent is dependent on many factors including concentration. |
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