Determination of trace rhodium by supramolecular catalytic kinetic spectrofluorimetry of 尾 -CD-rhodium-KBrO3-vanillin salicylhydrazone
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- 作者：Ning Zhang ; Qing-Cheng Kong ; Zhen-Zhen Chen ; Ke-Hua Xu and Bo Tang
- 关键词：Key words ; Catalytic kinetic spectrofluorimetry ; rhodium ; o ; vanillin salicylhydrazone ; β ; cyclodextrin ; supramolecular complex.
- 刊名：Microchimica Acta
- 出版时间：April, 2007
- 出版年：2007
- 期刊代码：95_0026-3672
- 类别：ch
- 卷：158
- 期：1-2
- 页码：165-171
- 数据来源：sp
摘要
A sensitive catalytic kinetic spectrofluorimetric approach for determining ng mL−1 levels of rhodium is presented, and the possible mechanism of the catalytic reaction was investigated. The determination is based on the catalytic property of rhodium to enhance the reaction of o-vanillin salicylhydrazone (OVSH) with potassium bromate in a water-ethanol medium at pH 4.80 and 45 掳C. The presence of β-cyclodextrin (β-CD) obviously sensitized the assay due to its high inclusion ability towards OVSH. Under optimized experimental conditions, fluorescence measurements of the β-CD-rhodium-KBrO3-OVSH catalytic kinetic reaction system were carried out in its fluorescent band centered at λex = 333 nm and λem = 476 nm, respectively. The calibration graph was linear over the concentration range of 0.47–100 ng mL−1 with a detection limit of 0.14 ng mL−1. The effect of interferences was discussed, and the results show that the extraction method can be used to separate rhodium from interference species such as iridium. The proposed method, applied to several synthetic mixtures containing rhodium mixed with varying amounts of metal salts, produced satisfactory results.