Publication: Simple and equipment-free paper-based device for determination of mercury in contaminated soil
Issued Date
2021-04-01
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ISSN
14203049
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2-s2.0-85105124825
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Mahidol University
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SCOPUS
Bibliographic Citation
Molecules. Vol.26, No.7 (2021)
Suggested Citation
Hikmanita Lisan Nashukha, Jirayu Sitanurak, Hermin Sulistyarti, Duangjai Nacapricha, Kanchana Uraisin Simple and equipment-free paper-based device for determination of mercury in contaminated soil. Molecules. Vol.26, No.7 (2021). doi:10.3390/molecules26072004 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76219
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Title
Simple and equipment-free paper-based device for determination of mercury in contaminated soil
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Abstract
This work presents a simple and innovative protocol employing a microfluidic paper-based analytical device (µPAD) for equipment-free determination of mercury. In this method, mercury (II) forms an ionic-association complex of tetraiodomercurate (II) ion (HgI4 2−(aq)) using a known excess amount of iodide. The residual iodide flows by capillary action into a second region of the paper where it is converted to iodine by pre-deposited iodate to liberate I2(g) under acidic condition. Iodine vapor diffuses across the spacer region of the µPAD to form a purple colored of tri-iodide starch complex in a detection zone located in a separate layer of the µPAD. The digital image of the complex is analyzed using ImageJ software. The method has a linear calibration range of 50–350 mg L−1 Hg with the detection limit of 20 mg L−1. The method was successfully applied to the determination of mercury in contaminated soil and water samples which the results agreed well with the ICP-MS method. Three soil samples were highly contaminated with mercury above the acceptable WHO limits (0.05 mg kg−1). To the best of our knowledge, this is the first colorimetric µPAD method that is applicable for soil samples including mercury contaminated soils from gold mining areas.