Resonance-Scattering Spectral Determination of H2O2 Using Rhodamine 6G Association Particles
LI Zhen-zhong1，JIANG Zhi-liang1*，YANG Guang1，LU Dan1，LIU Shao-pu2
1.Department of Resource and Environmental Science, Guangxi Normal University, Guilin 541004, China 2.Institute of Environmental Chemistry, Southwest China Normal University, Chongqing 400715, China
Abstract：Under the conditions of 0.02 mol·L-1 HCl-4.0×10-4 mol·L-1 KI-1.6×10-5 mol·L-1 Mo(Ⅵ), there is a fluorescence peak at 540 nm and a synchronous fluorescence peak at 540 nm for Rhodamine 6G (RhG).When there exists H2O2, it reacts with I- to form I-3.RhG and I-3 combine to form an ion association particle.The particles exhibit three resonance scattering peaks at 320 nm, 400 and 595 nm respectively.And there is fluorescence quenching at 540 nm.H2O2 concentration in the range of 0.068-34 μg·mL-1 is proportional to the resonance scattering peak at 400 nm.And a new resonance scattering spectral method has been described for the determination of H2O2 in water samples.The spectral results have verified that the formation of (RhG-I3)n association particles and the interface are the main factor that causes the fluorescence quenching and resonance scattering effects.
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