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2001•Journalof Southwest China Normal UniversityRequires access

A Study on Resonance Rayleigh Scattering Spectroscopy of [I_2 Br]-Ethyl Violet System

Luo Hong-qun

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Abstract

In dilute phosphoric acid solution in the presence of excess of KBr, the resonance Rayleigh scattering(RRS) of ethyl violet(EV) is very weak. But when EV reacts with the anionic complex of -, forming an ion-associate with large molecular structure, significant enhancement of RRS and a new RRS spectrum can be observed. RRS peaks are located at 535 nm and 335 nm. The optimum conditions of this reaction and the affecting factors have been investigated. The intensity of RRS is directly proportional to the concentration of iodide in the range of 0-0.64 μg/mL. The method has high sensitivity and the detection limit for I - is 1.58 ng/mL. The method has good selectivity, and can be applied to the determination of trace amounts of iodide.

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What this paper is about

In dilute phosphoric acid solution in the presence of excess of KBr, the resonance Rayleigh scattering(RRS) of ethyl violet(EV) is very weak. But when EV reacts with the anionic complex of -, forming an ion-associate with large molecular structure, significant enhancement of RRS and a new RRS spectrum can be observed. RRS peaks are located at 535 nm and 335 nm. The optimum conditions of this reaction and the affecting factors have been investigated. The intensity of RRS is directly proportional to the concentration of iodide in the range of 0-0.64 μg/mL. The method has high sensitivity and the detection limit for I - is 1.58 ng/mL. The method has good selectivity, and can be applied to the determination of trace amounts of iodide.

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Available abstract

In dilute phosphoric acid solution in the presence of excess of KBr, the resonance Rayleigh scattering(RRS) of ethyl violet(EV) is very weak. But when EV reacts with the anionic complex of -, forming an ion-associate with large molecular structure, significant enhancement of RRS and a new RRS spectrum can be observed. RRS peaks are located at 535 nm and 335 nm. The optimum conditions of this reaction and the affecting factors have been investigated. The intensity of RRS is directly proportional to the concentration of iodide in the range of 0-0.64 μg/mL. The method has high sensitivity and the detection limit for I - is 1.58 ng/mL. The method has good selectivity, and can be applied to the determination of trace amounts of iodide.

Key concepts: Rayleigh scattering, Resonance (particle physics), Chemistry, Detection limit, Iodide, Phosphoric acid, Spectroscopy, Analytical Chemistry (journal)

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