At the heart of the NanoAffix Lead Testing System is an electronic sensing platform effective in the detection of various contaminants in water, such as heavy metal ions, bacteria, and nutrients.
The sensor is based on the working principle of the graphene conductivity changing with the chemical binding of analytes to the surface. Therefore, the presence of the contaminants can be determined by measuring the sensor resistance change. Preliminary results have shown that the sensors can detect ions as low as 0.2 ppb, well below the maximum contaminant level (MCL) defined by the EPA of 15 ppb for lead 15 ppb. Most importantly, the platform responds to lead in seconds, which is promising for real-time monitoring of water quality.
The utilization of nanotechnology and graphene provides advantages of other devices. For example, it enables a robust and simple device structure, and rapid, sensitive, selective detection. This breakthrough technology allows real-time detection with minimal sample preparation and unprecedented sensitivity and specificity in field settings (outside a laboratory facility) for single point testing (e.g., handheld device) as well as for continuous monitoring (e.g., integrated into existing water equipment).