A LOW-COST PAPER-BASED MICROFLUIDIC IMPEDIMETRIC DEVICEC FOR THE DETECTION OF WATER HARDNESS

Indonesian Journal of Pure and Applied Chemistry Pub Date : 2021-11-15 DOI:10.26418/indonesian.v4i3.49447

M. N. Kaumal, Niroodha R. Pitawela

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Abstract

A microfluidic paper-based impedimetric device was developed as a water hardness sensor. This device is capable of performing the analysis with a sample volume of few microliters with no prior treatments. A phenol-formaldehyde graphene electrode modified with ethylenediaminetetraacetate was used as the working electrode. Ag pseudo reference and carbon electrodes were used to fabricate the device. Current simultaneous metal ion detection sensors are based on complex and expensive electrode setups. The proposed inexpensive, quick and portable device is capable of detecting Ca2+ and Mg2+ simultaneously. Electrode double layer-based charge transfer resistance and the maximum negative imaginary impedance produced a linear correlation with each metal ion concentration. The calculated limits of detection for Ca2+ and Mg2+ were 0.31 and 0.24 ppm, respectively. A set of samples containing Ca2+ and Mg2+ with a hardness of 2 ppm (as calcium carbonate) were used to test the device. The proposed tool is suitable as a semi-quantitative device for the determination of hardness in water.

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一种低成本的纸基微流控阻水仪

研制了一种基于微流控纸的水阻测量装置。该设备能够在没有事先处理的情况下，以几微升的样品体积进行分析。采用四乙酸乙二胺修饰的酚醛石墨烯电极作为工作电极。该器件采用银伪参比电极和碳电极制备。目前的同步金属离子检测传感器是基于复杂和昂贵的电极设置。所提出的廉价、快速和便携的装置能够同时检测Ca2+和Mg2+。电极双层基电荷转移电阻和最大负虚阻抗与各金属离子浓度呈线性相关。Ca2+和Mg2+的计算检出限分别为0.31和0.24 ppm。使用一组含有Ca2+和Mg2+的样品，硬度为2ppm(作为碳酸钙)来测试该装置。该工具适用于水中硬度测定的半定量装置。

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Indonesian Journal of Pure and Applied Chemistry

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