A new sensitive and selective fluorescence method for determination of chlorine dioxide in water using rhodamine S.
A new simple, selective and sensitive method for the determination of trace chlorine dioxide in water has been developed, based on the oxidation by chlorine dioxide to reduction the fluorescence of rhodamine dyes in ammonia-ammonium chloride buffer solution. Four rhodamine dyes systems such as rhodamine S, rhodamine G, rhodamine B and butyl-rhodamine B were tested. The rhodamine S system is the best, with a linear range of 0.0060-0.450mugmL(-1) and a detection limit of 0.0030mugmL(-1) ClO(2). It was applied to the determination of chlorine dioxide in synthetic samples and real samples, with satisfactory results. This method has good selectivity, especially, other chlorine species such as chlorine, hypochlorite, chlorite and chlorate do not interfere the determination. The mechanism of fluorescence reduction was also considered.
Jiang
Zhi-Liang
ZL
Department of Resource and Environment Science, Guangxi Normal University, Guilin 541004, Guangxi Province, PR China.
Zhang
Biao-Ming
BM
Liang
Ai-Hui
AH