A cheap LED light can now detect organic pollutants in city drinking water as accurately as a $10,000 lab machine.
Monitoring drinking water for organic matter usually requires expensive, bulky equipment that stays in a central laboratory. This new sensor uses consumer-grade LEDs to measure UV absorbance directly in the water pipes. It reduces the cost of continuous monitoring by several orders of magnitude while providing real-time data on water safety. By deploying these cheap sensors across a city grid, authorities can catch contamination events before they reach a single kitchen tap. This transforms water safety from a periodic lab check into a constant, digital shield for the public.
Low-Cost LED-Based UV Absorbance Sensor for Distributed Continuous Monitoring of Organic Matter in Drinking Water Systems
SSRN · 6710811
Contamination events in drinking water distribution systems can affect thousands of consumers within hours. Yet, most water utilities rely on infrequent grab sampling rather than continuous monitoring due to the prohibitive cost of deploying networked sensors across infrastructure. This study presents an LED-based ultraviolet absorbance sensor operating at 275 nm that reduces instrumentation costs by orders of magnitude while maintaining analytical performance suitable for real-time organic matt