Abstract
The usefulness of 6-nitro BIPS as a photochromic tracer in organic liquids has been investigated. The photochromic effect of this dye permits the solution to be decoloured conveniently after each tracer experiment so that the same liquid may be used in a closed loop for a large number of runs, which is essential for large scale experiments. The photochromic behaviour of the dye and the stability of its colourless form was studied in a range of solvents. Of all liquids tested, a number of alcohols including methanol, ethanol and their mixtures with glycerol proved to be fully compatible with the desired photochromic features. 6-Nitro BIPS was successfully used to study the axial dispersion of ethanol-glycerol mixtures of a wide range of viscosities in a 0.3 m diameter packed column. Tracer concentrations were monitored colorimetrically at various locations in the packing. The absorbance measurements of the liquid took place in several small flow-through cells inserted into the packing, which were optically connected to a light source and to photomultipliers by fibre optics.
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