Abstract

R. Ressalan, R. S. Chauhan, A. K. Goswami and D. N. Purohit

The colour reaction between chromium (111) with 3-hydroxy-3-p-tolyl-1-o-nitrophenyltriazene at 60-65oC in hexamine buffer (pH 5.2 to 6.0) results in the formation of a stable dark grassy green complex. The chromium (III) reagent ratio in this complex is 1:2 with absorption maximum at 510 nm. The molar absorptivity and Sandell's sensitivity values of the complex are 635 L/mole cm and 81.04 ng/cm2 respectively at the working wavelength 514 nm. The Beer's law Is valid over the concentrtion range 1.0 x 104 M of chromium (III). The standard deviation of the method for the determination of the metal is found to be 12.99 ± 0.0015 (0.94%) ppm of chromium The presence of 100 ppm of 15 diverse cations and anions did not interfere with the determination of 12.99 ppm of chromium (III). Thus a useful and simple method for spectrophotometry determination of chromium has been established.

Hydroxy; nitrophenyltriazene; absorptivity; spectrophotometry determination

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