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Microfluidic paper-based analytical device (µPAD) fabricated by wax screen printing technique for the determination of nitrite and nitrate ion in water samples

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Abstract

A microfluidic paper-based analytical device (µPAD) is a new technology platform for extremely low-cost sensing applications. This study aimed to explore for an inexpensive alternative fabrication method. Accordingly, a simple wax screen printing fabrication manageable with locally available materials has been elaborated and successfully demonstrated for the determination of nitrite and nitrate ion(s) in water samples. The operational parameters such as sample and Griess reagent volume, color development time, and zinc powder loading were optimized. Applying the optimal conditions, the limits of detection for nitrite and nitrate ion were found to be 0.16 and 0.87 ppm, respectively. The level of sensitivity observed in µPAD is adequate to determine the threshold concentration limit for nitrite (1 ppm) and nitrate (50 ppm) in drinking water set by WHO. The µPAD revealed 95% recovery compared with the standard method UV–vis spectrophotometry (> 96%), which indicates the validity of the developed method. Furthermore, the application of µPADs and UV–vis spectrophotometry for the analysis of Dire Dawa groundwater samples showed below the detection limit for nitrite. In contrast, 71 ppm of nitrate concentration was found in the ground water by using both methods. The concentration measured using µPADs was in an excellent agreement with the values obtained from UV–vis spectrophotometry. This implies a potential use of the µPADs for environmental monitoring of nitrate and nitrite in resources limited areas without the need for expensive benchtop analytical devices.

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The data sets supporting the results of this article are included within the article and supplementary materials.

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Acknowledgements

The authors thank Addis Ababa University Thematic Research Fund for supporting the project entitled “Developing Innovative Microfluidic Paper-Based Analytical Devices (μ-PADs): Viable solution for Environmental Monitoring in Ethiopia” at the Centre for Environmental Science. The authors also acknowledge Dawit Firemichael, Gizachew Wendimu and Dr. Yedilfana Setarge for their assistance in editing the manuscript.

Funding

Addis Ababa University, Thematic Research Fund by the office of the Vice President for Research and Technology Transfer (VPRTT/PY-021/2018/10).

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Authors and Affiliations

  1. Center for Environmental Science, College of Natural and Computational Sciences, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia

    Tilaye Tesfaye & Ahmed Hussen

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  1. Tilaye Tesfaye
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  2. Ahmed Hussen
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TT performed the experiment, analyzed the data and prepared zero draft of the manuscript. AH contributed to the conception of the study, methodology analyzed the data and wrote the manuscript.

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Correspondence to Ahmed Hussen.

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The authors declared that they have no competing interests.

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Tesfaye, T., Hussen, A. Microfluidic paper-based analytical device (µPAD) fabricated by wax screen printing technique for the determination of nitrite and nitrate ion in water samples. Microfluid Nanofluid 26, 22 (2022). https://doi.org/10.1007/s10404-022-02520-8

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