Abstract
Monitoring of toxic contaminants is very important for the preservation of the environment. Arsenic contamination of drinking water is a major global problem. Its maximum contamination limit (MCL) in drinking water is 0.01 mg/l as per the World Health Organization (WHO) and 0.05 mg/l in absence of alternate sources as per the Bureau of Indian Standards (BIS) for drinking water. Cancer, diabetes, and cardiovascular problems are also linked to arsenic poisoning. In this work, a detection mechanism based on colorimetry, for detecting trivalent arsenic in water, is presented. Polydimethylsiloxane (PDMS)-based microfluidic channels are fabricated with the help of the x-ray lithography (XRL) technique. An embedded system is integrated to detect the concentration of arsenic within the range of 0.1 to 3.0 mol/l. The microfluidic system consists of a fluid handling setup, colorimetric data acquisition, and a Raspberry-Pi-based smart sensing platform. It was calibrated by placing it in a compact and rugged enclosure to nullify the lighting interference without compromising the accuracy. The detection limit was found out to be 0.07767 µg/l, and the detection time required was about 1 min/sample. This method has the potential to be developed as a rapid field kit.
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Acknowledgements
The fabrication work for the microchannels was carried out within the framework of Indus 2, at x-ray lithography beam line (BL-07) at RRCAT, Indore, India. The authors would like to acknowledge Mr. Nitin Khantwal for his strong technical assistance throughout the fabrication work. The authors would also like to thank Dr. Arvind Kumar Srivastava for his support during the fabrication process of the microchannels. This work was also supported by Center for Microsystems, Young Faculty Research Scheme, Shri Ramdeobaba College of Engineering and Management (RCOEM), Nagpur, India, and DST FIST (Level-0). We also acknowledge Dr. Suraj Butoliya and Dr. Pandhurnekar from Department of Chemistry, RCOEM, for hel** us in sample preparation and testing. We are also thankful to Dr. Mahendra Kadu and Dr. Trupti Gupta in-charge Environmental Engineering lab, Department of Civil Engineering, RCOEM, for providing lab support inclusive of spectrophotometer.
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Ali, S.S., Waghwani, B.B., Anjankar, S. et al. Microfluidic Based Analyzer for Water Dissolved Arsenic (AsIII) Detection. Water Air Soil Pollut 232, 507 (2021). https://doi.org/10.1007/s11270-021-05449-w
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DOI: https://doi.org/10.1007/s11270-021-05449-w