Abstract

D. N. Purohit and J. K. Humad

Two new hydroxytriazenes namely 3-hydroxy-3-p-tolyl-1-o-carboxyphenytriazene (I) and 3-hydroxy 3-p-chlorophenyl-1-o-carboxyphenyl triazene (II) have been synthesized and used in the spectrophotometric determination or uranyl ion. Both the reagents formed reddish orange 1:1 complex with uranyl ion in the pH range 4.5 — 7.5 for (I) and 5.0—6.5 for (II) in ethanol medium. For compound (I) the wave length of maximum absorbance working wavelength, molar absorptively. 1 mole-icm-i, SandelPs sensitivity (in ^g cm-2) and standard deviation are 392-394 nm; 400 nm; 5566; 0.0428; 0.91% and these values for compound (II) are 402-404 nm; 400 nm; 7032; 0.0338, 0.59% respectively. Beer's law was obeyed upto 33.32 p.p.m. in each case. Stability constant and standard free energy of formation values in each case are reported, For the attainment of full absorbance value a two fold concentration of the reagent is recommended.

Determination; Uranyl; Ion; Spectrophotometric

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