Daftar Isi: Vanadium(V) Complexes of N-cinnamoyl-N-o-methoxy-phenylhydroxylamine and N-cinnamoyl-N-p-methyl-phenylhydroxylamine. Its Determination in Alloy Steels and Rock Samples

Daftar Isi:

Chemistry Department, Sadavpur University, Calcutta-700 032 Manuscript received 4 October 1978, revised 9 January 1980, accepted 31 March 1980 N-cinnamoyl-N-o-methoxyphenylhydroxylamine(I) and N-cinnamoyl-N-p-methylphenylhydroxylamine (II) form complexes of vanadium(V), bluish violet in color and extractable into chloroform, having λmax at 530 nm and 550 nm with metal to ligand ratio of 1:2 in the acidity range 2-5 ( with I ) and 1-5N HCl ( with II ). Beer's law is obeyed over 1-14 ppm and 0.4-14 ppm of vanadium with optimum concentration ranges of 2-10 ppm and 1.4-10 ppm for complexes of I and II respectively, the % relative error is 2.70 and 2.92 for the complexes, the molar absorptivities (ε) are 6000 and 5900 1.mol-1 cm-1 while the sensitivities are 0.0085 and 0.0086 μg V/cm2 respectively. The extraction constant, Ke x, is evaluated from the intercept of the Hiskey-Meloche's plot. A spectrophotometric method based on solvent extraction technique, for the trace analysis of vanadium(V) in presence of diverse ions, in alloy steels and rock samples, has also been described.