Abstract

In near neutral to weak basic media, sodium carboxymethyl cellulose (NaCMC) will dissociate to become a macro polymeric anion, which can react with acridine yellow (AY) or acridine orange (AO) to form an ion-association complex resulting in fluorescence quenching of the acridine dyes. The maximum fluorescence quenching wavelength is 505 nm ( λ ex = 440 nm) for AY system and 530 nm ( λ ex = 493 nm) for AO system, respectively. The fluorescence quenching values (Δ F) are directly proportional to the concentrations of NaCMC and the linear ranges are 20.0–4000 μg/L for AY system and 20.0–7000 μg/L for AO system, separately. This method has high sensitivity and the detection limits for NaCMC are 58.0 μg/L (AY system) and 157.2 μg/L (AO system). The effects of coexistent substance have been investigated, and the results show that this method has a relatively good selectivity. A fluorescence quenching method for the determination of NaCMC based on the ion-association reactions of CMC polymeric anion with a basic acridine dye was developed. The method is sensitive, simple and fast.

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