Abstract
A highly sensitive extraction-spectrophotometric method for determination of dicyclohexano-substituted crown ethers in aqueous solutions is described. It is based on the extraction of the macrocyclic complex, which comprises bromothymol blue as a colored organic anion, from aqueous solution into toluene. This method allows obtaining the limit of DCH18C6 detection in water of 2 × 10−7 M. It provides an efficient tool for monitoring the stability of crown-containing extractants and adsorbents upon contact with water and nitric acid solutions.
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