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The interaction of azur A (AA) with DNA in aqueous medium has been studied by measurement of resonance light scattering (RLS), and accordingly a method for DNA determination is proposed with sensitivity at the ng level. At pH 3.29 and ionic strength 0.003, the RLS of AA was greatly enhanced by DNA characterized by the maximum scattering peaks at 398 and 472nm. Mechanistic studies show that the interaction...
Resonance Rayleigh scattering (RRS) of chromium(VI)-iodide-basic triphenylmethane dye (BPTMD) systems and their analytical applications have been studied. In dilute phosphoric acid solution in the presence of excess I − , chromium(VI) oxidizes I − producing I 2 , which binds I − to form I −3 and I −3 further reacts with a basic triphenylmethane...
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