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Detection of mercury ions in water using a membrane-based colorimetric sensor

机译：基于膜的比色传感器检测水中汞离子

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摘要

A basic requirement of colorimetric sensors is that they must allow the analyte to access the chromophores. This study elucidates the fundamental sensitivity of membrane morphology (membrane pore sizes between 0.32 and 1.30 mu m) and its influence on the loading of chromophores (dithizone, DTZ, in present work), to detect mercury (Hg2+) at concentrations ranging from 3 ppm to 10 ppm. The flat sheet cellulose acetate (CA) membrane acts as the platform for dithizone loading through non-covalent hydrogen bonding of DTZ to the CA membrane. The membranes were prepared by using different polymer-dissolving solvents (formic acid and acetic acid) with the addition of water as the non-solvent to improve the membrane porosity. A significant positive correlation between the membrane porosity and the sensor's sensitivity was observed through the visible color changes of the colorimetric membrane strip from green (color intensity at R-axis of 70) to magenta (color intensity at R-axis of 187) when it was in contact with 3 ppm Hg2+ solution. A colorimetric strip allowing naked eye detection at 3 ppm Hg2+ was achieved. This work demonstrates that the physical and chemical characteristics of a membrane are important factors that determine the performance and sensitivity of a colorimetric sensor.
机译：比色传感器的基本要求是它们必须允许分析物进入发色团。本研究阐明了膜形态（0.32和1.30μm）的基本敏感性（膜孔径介于0.32和1.30μm），其对发色团的负荷（DITHIZONE，DTZ，目前工作）的影响，以3 ppm的浓度检测汞（HG2 +）到10 ppm。平板纤维素乙酸纤维素（CA）膜作为通过DTZ的非共价氢键到Ca膜的二硫胺负载的平台。通过使用不同的聚合物溶解溶剂（甲酸和乙酸）加入水作为非溶剂来制备膜以改善膜孔隙率。通过从绿色膜带的可见颜色变化从从绿色（R轴的颜色强度为70）到品红色（187的R轴上的颜色强度），观察到膜孔隙率和传感器的灵敏度之间的显着正相关性与3 ppm hg2 +溶液接触。实现了在3 ppm Hg2 +下允许肉眼检测的比色条。这项工作表明，膜的物理和化学特性是确定比色传感器的性能和灵敏度的重要因素。

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  • 来源
    《RSC Advances》 |2018年第1期|共11页
  • 作者

    Azmi N. A.; Ahmad S. H.; Low S. C.;

  • 作者单位

    Univ Sains Malaysia Sch Chem Engn Engn Campus Nibong Tebal Sps 14300 Penang Malaysia;

    Univ Sains Malaysia Sch Chem Engn Engn Campus Nibong Tebal Sps 14300 Penang Malaysia;

    Univ Sains Malaysia Sch Chem Engn Engn Campus Nibong Tebal Sps 14300 Penang Malaysia;

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  • 正文语种 eng
  • 中图分类 化学;
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