Abstract
2-Hydroxy-1-naphthaldehydebenzoylhydrazone (OHNABH) reacts with V V and Cu I I at pH 5.0 forming respectively yellow and green coloured soluble complexes in 30% DMF. The first derivative amplitude measurements show that Beer's law is obeyed in the range 0-7.5 μg ml - 1 for V at 465 nm and 0-4.5 μg ml - 1 for Cu at 443 nm. The sensitivity of the method is greater than the zero order method, and foreign ions like U V I , Th I V , Cr V I which interfere in zero order method, do not interfere even in large excess, Vanadium and copper present in a mixture are simultaneously determined without solving the simultaneous equations by measuring the first derivative amplitudes at 412.6 and 430.2 nm for V and Cu, respectively. The method is applied for the determination of Cu in food materials, V in alloy steels, and both V and Cu in chromium-vanadium steel.
Published Version
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