A novel, simple and sensitive resonance scattering spectral method for the determination of chlorite in water by means of rhodamine B |
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Authors: | KANG Cai-yan JIANG Zhi-liang XI Dan-li HE Xing-cun |
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Affiliation: | 1. College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China;School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China 2. Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541004, China;School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China 3. College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China 4. School of Environmental Science and Resource, Guangxi Normal University,Guilin 541004, China |
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Abstract: | 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 microg/ml, 0.0102-0.292 microg/ml, 0.00726 0.145 microg/ml and 0.0290 0.174 microg/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 microg/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. |
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Keywords: | chlorite rhodamine dye association complex particles resonance scattering effect |
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