Jiang Zhi-Liang, Zhang Biao-Ming, Liang Ai-Hui
Department of Resource and Environment Science, Guangxi Normal University, Guilin 541004, Guangxi Province, PR China.
Talanta. 2005 Apr 30;66(3):783-8. doi: 10.1016/j.talanta.2004.12.037. Epub 2005 Jan 19.
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.
基于二氧化氯在氨 - 氯化铵缓冲溶液中氧化罗丹明染料使其荧光猝灭，开发了一种测定水中痕量二氧化氯的新方法，该方法简单、选择性好且灵敏度高。测试了罗丹明S、罗丹明G、罗丹明B和丁基罗丹明B等四种罗丹明染料体系。罗丹明S体系最佳，线性范围为0.0060 - 0.450μg mL⁻¹，二氧化氯的检出限为0.0030μg mL⁻¹。该方法用于合成样品和实际样品中二氧化氯的测定，结果令人满意。此方法具有良好的选择性，特别是氯、次氯酸盐、亚氯酸盐和氯酸盐等其他氯物种不干扰测定。还探讨了荧光猝灭的机理。
