长江科学院院报 ›› 2019, Vol. 36 ›› Issue (1): 29-33.DOI: 10.11988/ckyyb.20170835

• 水资源与环境 • 上一篇    下一篇

新型含砷水样前处理技术开发研究

彭恋1, 王立帆2, 张德兵1, 赵起超3   

  1. 1.长江中游水文水资源勘测局,武汉 430010;
    2.长江勘测规划设计研究院,武汉 430015;
    3.长江水利委员会 水文局,武汉 430015
  • 收稿日期:2017-07-25 出版日期:2019-01-01 发布日期:2019-01-17
  • 通讯作者: 赵起超(1984-),男,满族,河北易县人,高级工程师,博士研究生,研究方向为样品前处理技术、色谱分离技术和离子液体在水环境水生态监测中的应用。E-mail:zhaoqc@cjh.com.cn
  • 作者简介:彭 恋(1987-),女,湖北武汉人,工程师,硕士研究生,研究方向为水环境水生态监测新技术新方法的开发和应用。E-mail:zypengl@cjh.com.cn
  • 基金资助:
    湖北省自然科学基金项目(2015CFB633)

A Novel Method of Sample Pre-treatment for Extraction of Arsenite from Water

PENG Lian1, WANG Li-fan2, ZHANG De-bing1, ZHAO Qi-chao3   

  1. 1. Middle Changjiang River Bureau of Hydrology and Water Resource Survey, Wuhan 430010, China;
    2. Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430015, China;
    3. Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430015,China
  • Received:2017-07-25 Online:2019-01-01 Published:2019-01-17

摘要: 砷是一种对人体健康造成严重伤害的污染物,受管理规定和检测手段的限制,由砷诱发癌症的风险仍然较高。选取离子液体作为萃取溶剂,开发出一种基于离子交换机理的分散液液微萃取方法,应用于含砷水样的前处理。通过研究水样体积、pH值、离子液体用量等6项关键因素对该方法萃取效率的影响,以及对该方法的表现效果进行了优化和评价。本方法可在数分钟内完成对砷的萃取,富集因子可达到210,在0.05~10 μg/L范围内均有较好线性关系,相对标准偏差仅为1.5%;当本方法与石墨炉原子吸收光谱仪联用时,对砷的检出限可达到10 ng/L。另外,避免了传统样品前处理方法中使用的大量有机溶剂,因此更加绿色、环保。研究结果为水环境分析监测技术领域的开拓和发展提供了新思路。

关键词: 分散液液微萃取, 砷含量, 污染物, 离子液体, 离子交换, 石墨炉原子吸收光谱

Abstract: Inorganic arsenic has been identified as a harmful pollutant to human health. However, the regulated standard of arsenite concentration set by administration exposes people to relatively high risk, partially due to the limitation of analysis method. In this work, a dispersive liquid-liquid extraction method was developed and applied to the extraction of arsenite from water. Ionic liquids (ILs) were selected as extraction solvent. Effect of key factors including sample volume, pH value, and amount of ILs on the extraction efficiency of the proposed method were studied. By using the proposed method, the extraction of arsenite can be completed in minutes with the enrichment factor reaching 210 and a good linearity in the range of 0.05-10 μg/L under optimized condition, yet an error only 1.5%. When coupled with atomic absorption spectrometer equipped with graphite furnace atomizer, the limit of arsenite detection was found as low as 10 ng/L. In addition, the proposed method consumes little organic solvents, making it more environmental friendly

Key words: dispersive liquid-liquid microextraction, arsenite content, pollutant, ionic liquids, ion exchange, atomic absorption spectroscopy

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