Microfluidic electrochemical nitrate sensor using a thin-film copper microelectrode
Nitrate exists naturally in the environment, and is mainly used in inorganic fertilizers as a plant nutrient. Meanwhile, contamination of water by nitrate ions has been a persistent problem as a result. The World Health Organization (WHO) guidelines have therefore suggested the maximum nitrate conce...
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| Format: | Final Year Project |
| Language: | English |
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Nanyang Technological University
2021
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| Online Access: | https://hdl.handle.net/10356/147825 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Nitrate exists naturally in the environment, and is mainly used in inorganic fertilizers as a plant nutrient. Meanwhile, contamination of water by nitrate ions has been a persistent problem as a result. The World Health Organization (WHO) guidelines have therefore suggested the maximum nitrate concentration in drinking water at 50 ppm (mg/L). Thus, an accurate, rapid, portable, easy-to-operate and stable nitrate monitoring platform is in need. Electrochemical sensors have been used widely in many industries including environmental, food, pharmaceutical and clinic analysis, etc. In this report, a miniaturized, sensitive and stable electrochemical nitrate sensor has been designed, fabricated and tested. The thin-film copper micro working electrode, platinum pseudo reference electrode, and platinum counter electrode are coated onto a glass wafer. The microchannel is bonded with the glass wafer to create a microfluidic device to allow in-situ flow-through analysis. The amperometry method is employed to determine the nitrate concentration. The as-fabricated device exhibits a wide linear range of 10 μM – 10 mM (0.62 – 620 ppm) with a sensitivity of 0.270 μA μM-1 cm-2 a detection limit of 1.00 μM (S/N = 3). |
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