A novel, simple and sensitive resonance scattering spectral method for the determination of chlorite in water by means of rhodamine B

• Published in: 环境科学学报(英文版) Vol. 18; no. 5; pp. 1000 - 1003
• Main Authors: KANG Cai-yan, JIANG Zhi-liang, XI Dan-li, HE Xing-cun
• Format: Journal Article
• Language: English
• Published: College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China 2006; School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China%College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China%School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China; School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China%Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541004, China
• Subjects: resonance scattering effect; rhodamine dye; association complex particles; chlorite
• ISSN: 1001-0742; 1878-7320
• DOI: 10.3321/j.issn:1001-0742.2006.05.029

X131.2%X830.2; A new resonance scattering method was proposed for the determination of chlorite, basing on the resonance scattering effect of rhodamine dye. In HCl-sodium acetate buffer solution, chlorite oxidizes I- into I2 and the reaction of I2 and excess I- results in I3-. It is respectively combined with rhodamine dyes, including rhodamine B (RhB), butyl rhodamine B (b-RhB), rhodamine G (RhG)and rhodamine S (RhS), to form association complex particles, which exhibit stronger resonance scattering (RS) effect at 400 nm. The chlorite concentration of ClO2-in the range of 0.00726-0.218 μg/ml, 0.0102-0.292 μg/ml, 0.00726-0.145 μg/ml and 0.0290-0.174 μg/ml is respectively linear to the RS intensity of association complex particle systems at 400 nm for the RhB, b-RhB, RhG and RhS. The detection limits of the four systems were respectively 0.00436, 0.00652, 0.00580 and 0.01450 μg/ml ClO2-. In the four systems, the RhB system possesses good stability and high sensitivity. It has been applied to the analysis of chlorite in wastewater with satisfactory results.