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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (07): 717-721. 上一篇    下一篇

研究简报

浊点萃取-分光光度法测定自来水及酒类样品中的痕量铁

昌征1,2，阎宏涛*,1，黄家剑1   

  1. (1西北大学化学与材料科学学院 西安 710069)
    (2宝鸡文理学院化学化工系 宝鸡 721013)
  • 投稿日期:2009-07-09 修回日期:2009-10-16 发布日期:2010-04-14
  • 通讯作者: 阎宏涛 E-mail:htyan@nwu.edu.cn
  • 基金资助:

    陕西省自然科学基金（2007B01）

>Determination of Trace Iron in Water and Wine Samples by Spectrophotometry with Cloud Point Extraction

Chang Zheng1,2 Yan Hongtao*,1 Huang Jiajian1   

  1. (1 College of Chemistry and Materials Science, Northwest University, Xi an 710069)
    (2 Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013)
  • Received:2009-07-09 Revised:2009-10-16 Published:2010-04-14

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1360

被引次数

39 | 4

利用非离子表面活性剂Triton X-100在温度高于其浊点时形成相分离行为, 建立了浊点萃取-分光光度法测定痕量铁的新方法, 探讨优化了以KSCN为显色剂, Triton X-100浊点萃取富集痕量铁的实验条件. 研究发现: 加入正辛醇可使Triton X-100的浊点降低约30 ℃, 有利于萃取实验的进行; 同时, 加入的正辛醇与Triton X-100对痕量铁起到了协同萃取作用. 在优化了的实验条件下, 进行了痕量铁的分析, 检出限为0.02 mg•L－1, 加标回收率为97.4%～101.6%, 应用于自来水及酒类样品中痕量铁的测定, 结果满意.

关键词: 浊点萃取, 分光光度法, 痕量铁, 自来水, 酒

A new method utilizing non-ionic surfactant of Triton X-100, which can be separated into two phases by heating to its cloud point, was developed to extract trace iron. And the effect of experimental conditions, such as Triton X-100 as surfactant and potassium thiocyanate as complexing agent on cloud point extraction (CPE), was also discussed. The CPE process was improved by reducing the cloud point of the surfactant solution about 30 ℃ with octanol; and the iron was co-extracted by Triton X-100 and octanol. Under the optimal experiment conditions, the detection limit was 0.02 mg•L－1, and the recovery of iron was 97.4%～101.6%. The method has been applied to the determination of trace iron in water and wine samples with satisfactory results.

Key words: cloud point extraction, spectrophotometry, trace iron, tap water, wine