| 动力学光度法测定环境样品中微量钒 |
| 摘要点击 1494 全文点击 1727 投稿时间：1991-05-21 |
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| 中文关键词 钒 测定 动力学光度法 环境样品 |
| 英文关键词 vanadium kinetic spectrophotometry |
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| 中文摘要 |
| 本文研究了V(Ⅳ)对Cr2O72--I--淀粉氧化还原反应体系的诱导作用,以此为基础提出了一种测定微量钒的动力学新方法,并建立了测定最佳条件:[Cr2O72-]=8.4×10-5mol·L-1,[I-]=2.1×10-3mol·L-1,pH=2.1,585nm。在此条件下,钒(Ⅳ)含量在0—6.6μg·ml-1范围内符合比尔定律,方法检测限为0.02μgV(IV)·ml-1。除Fe3+,Fe2+,Sn2+,Ti3+外,其它共存离子不影响测定。用本方法测定了几种环境样品中的微量钒,结果满意,标准加入回收率为95.1—98.3%。 |
| 英文摘要 |
| A novel kinetic spectrophotometric method for the determination of trace amount of vanadium was proposed based on the inductive effect of Ⅴ(Ⅳ) on Cr2O72--I--starch redox reaction. The optimal conditions for the determination were established as: 8.4×10-5mol L-1I-, pH = 2.1 and the determination shoulp be carried out at a wavelenth of 585nm. The calibration graph was linear for vanadium (Ⅳ) concentration ranging from 0 to 6.6 μg·mL-1 under optimal conditions mentioned above, and the detection limit was determined to be 0.02 μgⅤ(Ⅳ)·mL-1. The procedure is highly selective for Ⅴ(Ⅳ) since most coexisted foreign ions have no interference on the determination except for Fe3+, Fe2+, Sn2+ and Ti3+. Trace amount of vanadium waste in water and soil was determined and satisfactory were obtained, the recovery was observed to be 95.1-98.3%. |
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