Spectrophotometric determination of niobium(V) with n-propyl 3,4,5-trihydroxybenzoate.
The use of n-propyl 3,4,5-trihydroxybenzoate (PTB) for the spectrophotometric determination of niobium is investigated. PTB yields a yellowish-orange ML(2) chelate with Nb(V) at pH 6.1. The formation constant at pH 6.1 is about 10(10). Beer's law is obeyed over the range 0-100 mug of Nb per ml.
Jasim
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Department of Chemistry and Food Technology College of Agriculture University of Baghdad Baghdad, Iraq.