α-METHYL,2 :4 DIHYDROXY BENZYLIDENE, 2-AMINOANILINE (MDA) AS AN ANALYTICAL REAGENT FOR THE COLORIMETRIC DETERMINATION OF MICROAMOUNTS OF CHROMIUM (VI).

S SRINIVASAN, V SESHAGIRI

Abstract


Chromium(VI) in ac'd medium showed deep red colour with a-methyl, 2 :4-dihydroxy benzylidene-2,aminoaniline (MDA). The colour reaction obeyed Beer's law in the concentration range 026-64 niml at 490nm with 1.0-5.2 pgiml being optimum concentration range. The stoichioraetry of the colour reaction is 1 :1. The molar absorptivity and Sandell's sensitivity are 6-9 x 10^3 lit. mole^-1.cm^-1 and 0.0074 mu g / cm^-2 respectively.

Keywords


a-Methyl, 2 : 4-dihydroxy benzylidene, 2-aminoaniline, chrornium(VI), calorimetric method.

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