Chemiluminescence Analysis for Trace Pollutants

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Abstract
The sensitivity of luminol chemiluminescence to small catalyst concentrations can be exploited for environmental analysis in several ways. Selective methods for Cr(III) and Fe(II) in complex solutions have been applied to natural samples. The detection limits are 0.03 mcg/l and 0.005 mcg/l, respectively. Species that do not catalyze luminol chemiluminescence can be determined by titration with reagents that catalyze the reaction. For example, arsenic and aqueous sulfur dioxide can be titrated with iodine, an efficient catalyst. MnO4-, OCl-, V(II), and Cr(II) are other catalysts that can be used as titrants. Preliminary ion exchange separation in concentrated LiCl solutions extends chemiluminescence to other catalysts of the luminol reaction: Ni(II), Co(II), Mn(II), Cu(II), and V(IV).