How to determine the concentration of the P507 extractant in the organic phase?
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This post was last edited by FORREST_GUMP on 2025-12-15 at 16:57. Dear experts: For the P507 cobalt extraction process, it is necessary to check whether the extractant in the organic phase has been consumed after it has been in use for a while, and then replenish the extractant. How to determine the concentration of the organic phase P507 extractant? The initial organic phase consists of 20% P507 and 80% kerosene. In industry, the non-aqueous potentiometric titration method is commonly used, in which an alcoholic solution of a base such as KOH is used to titrate the organic phase, with the endpoint being determined by a potential jump. Are there any other methods for detecting the concentration of extractants besides non-hydroelectric potentiometric titration?
P507 is an alkyl phosphate with an ester group; conventional analysis methods are rather cumbersome. Reverse-phase liquid chromatography can be used for its analysis, using methanol or acetonitrile as the eluent, along with a weakly basic buffer system. A refractometric detector or an ELSD detector can be employed, and C18 columns should work well for this purpose. The specific analysis method still requires analysts to optimize the conditions