AI Article Synopsis
- A new sensor using bare platinum electrodes on glass can measure pH, ORP, and conductivity all at once, reducing the need for multiple sensors.
- It effectively measures pH from 4 to 10, ORP from 150 to 800 mV, and conductivity up to 8000 μS/cm across a temperature range of 10 °C to 50 °C.
- This sensor is low-cost (about $0.10 per unit), small in size (less than 1 mm²), and can function well in typical residential water conditions, making it versatile for various applications, including microfluidic systems.
Article Abstract
Monitoring of the pH, oxidation-reduction-potential (ORP), and conductivity of aqueous samples is typically performed using multiple sensors. To minimize the size and cost of these sensors for practical applications, we have investigated the use of a single sensor constructed with only bare platinum electrodes deposited on a glass substrate. The sensor can measure pH from 4 to 10 while simultaneously measuring ORP from 150 to 800 mV. The device can also measure conductivity up to 8000 μS/cm in the range of 10 °C to 50 °C, and all these measurements can be made even if the water samples contain common ions found in residential water. The sensor is inexpensive (i.e., ~$0.10/unit) and has a sensing area below 1 mm², suggesting that the unit is cost-efficient, robust, and widely applicable, including in microfluidic systems.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5539692 | PMC |
| http://dx.doi.org/10.3390/s17071655 | DOI Listing |
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