Abstract
Chemiluminescence was observed from reactions with a Mn(IV) colloid generated by reduction of KMnO4 with Na2S2O3. Due to the limited stability of the colloid under acidic conditions and the poor reproducibility of the chemiluminescence signal when the reagent was prepared by published methods, an in situ (on-line) method of preparation utilising flow injection analysis methodology was developed. This approach provided superior emission intensities to the conventional Mn(IV) reagent, although less enhancement was obtained from the addition of formaldehyde. The selectivity of the reagent was ‘tuned’ towards specific classes of analyte through convenient modification of reaction conditions. Contrary to some previous reports, we attribute this chemiluminescence to the formation of an electronically excited Mn(II) species, based on direct comparison of the spectral distribution with that of other chemiluminescence reactions.
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