The Reaction Of Chromium With 1,5Diphenylcarbazide

Abstract

The most popular spectrophotometric method for the determination of chromium is based on th2 formation of the characteristic intense red-violet colour with 1,5-diphenylcarbazide (1,5-diphenylcarbshydrazine) with the wavelength of maximum absorbance between 540nm and 550nm. This reagent reacts with several other metals e.g, mercury, copper, cadmium, silver, lead, nickle, cobalt, magnessium, iron, etc. (Cazeneuve 1900, Welcher 1947, Sandell 1959), giving coloured products. But, under the conditions of low pH required for chromium determination, the sensitivity of these coloured products is so low that the method can be ccnsidered prGctically selective for chromium.