頁籤選單縮合
| 題 名 | Flotation-Spectrophotometric Determination of Trace Amounts of Thorium |
|---|---|
| 作 者 | Pourreza, N.; Parham, H.; Mirzavand, P.; | 書刊名 | Journal of the Chinese Chemical Society |
| 卷 期 | 56:4 2009.08[民98.08] |
| 頁 次 | 頁785-788 |
| 分類號 | 341 |
| 關鍵詞 | Flotation-spectrophotometry; Thorium; Xylenol orange; Ion-associate; |
| 語 文 | 英文(English) |
| 英文摘要 | A simple, sensitive and reproducible flotation-spectrophotometric method for the determination of thorium is reported. The method is based on the ion-associate formation between thorium, xylenol orange (XO) and cethyltrimethyl ammonium bromide (CTAB) which is floated in the interface of the aqueous phase and n-hexane by vigorous shaking. By discarding the aqueous solution and n-hexane, the adsorbed ion-associate (Th-XO-CTAB) on the wall of a separating funnel was dissolved in a small volume of ethanol solvent, and its absorbance was measured at 568 nm. The effects of different parameters such as pH, concentrations of HCl, XO, and CTAB, volume of n-hexane, and standing and shaking time were studied. The calibration graph was linear in the concentration range of 2-200 ng mL-1 of thorium(r = 0.9994). The limit of detection (LOD) is 1.4 ng mL-1. The relative standard deviations (RSD) at 50 and 175 ng mL-1 of thoriumwere 2.5% and 1.0% (n = 7), respectively. The method was successfully applied to the determination of thorium in gas mantel samples. |
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