Gravimetric Separation and Estimation of Cobalt and Copper Using N-p-Chlorophenylcinnamohydroxamic Acid
نویسنده
چکیده
N-Phenylbenzohydroxamic acid (PBHA) and its derivatives are widely employed as gravimetric reagents for many metal ions15• PBHA has also been reported as a reagent for the gravimetric estimation of copper and cobalt6• However it has been found that the introduction of electrophilic substituents like chlo.riine on the N-phenyl ring of the hydroxamic acid renders the reagent more selective due to the reduced stability of the metal complexes7• Hence N-p-chlorophenylcinnamohydroxamic acid (p-CPCHA)8 was examined for gravimetric separation of cobalt and copper. The reagent was found to be well suited for gravimetric estimation as well as separation of the above two metals. The precipitate obtained is granular, nonsticky and easily filtrable having low conversion factors (for Co 0.09773 and for Cu 0.1042). The estimations and separation can be carried out in the presence of several foreign ions.
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