Abstract

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

Application of 3-hydroxy-3-m-tolyl-1-m-nitrophenyltriazene as metallochromic indicator tor the comptexometrtc determination of trace amounts or chromium (III) has been described. Using this reagent as indicator the selective complexometric determination of Cr (III) in binary and ternary metal ion mixtures has also been done. The end pomt of the titration is marked by change of colour from violet to yellow pH 5 .2 to 6. 0 with hexamine buffer .The presence of 20 fold excess of eleven diverse caoons and anions did not interfere with the determination of 5. 2 mg of Cr (III).The amount of metal ions found was in good agreement with the amount of metal ions actually present so the determination are quite accurate. For sake of comparison parallel titrations were earned out using xylenol orange as indicator. Thus a useful method for the complexometic determination of chromium (III) has been established.

Nitrophenyltriazene; metallochromic; complexometric hydroxy

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