Heavy metal ion and pH sensing device.
Current analytical devices used to determine the heavy metal concentrations are expensive, bulky, require professional operators, and higher operation cost.
This sensor utilizes a new electrode material that enables greater level of detection (0.07 ppb for Pb2+) for heavy metal ions. The electrode determines the pH independent from heavy metals, and the measured pH can be used to correct pH-heavy metal concentration-sensor measurement curves for determining accurate heavy metal concentrations regardless of the pH of the sample. This nanocomposite is highly stable and has ultrahigh sensitivity to detect lead at levels two orders of magnitude below the 10 ppb limit for drinking water set by the WHO. This sensor can be used for disposable one-time use, as well as long-term monitoring.