A groundbreaking innovation in environmental monitoring has emerged from the collaboration between Nanjing University and Nanjing Normal University. Researchers have developed a low-cost sensor that can detect toxic perchlorate in water, a harmful pollutant often released into rivers and drinking water through fireworks manufacturing and industrial operations. This affordable sensor, costing less than two US dollars, is inspired by porphyrin molecules and offers rapid and highly accurate detection of perchlorate, a pollutant known for its mobility, water solubility, and stability. The sensor's chemical recipe was refined through systematic screening and optimization, leading to excellent selectivity, a wide detection range, and extremely low detection limits. The sensor reacts rapidly, delivering results in as little as five seconds, and can tolerate a broad variety of environmental conditions, including a wide range of pH (from acidic to mildly alkaline). When tested in actual fireworks production wastewater and in natural surface waters, the device proved capable of detecting perchlorate with impressive recovery rates—often matching the measurement accuracy of much more expensive instruments. The sensor's low cost and ease of use make it ideal for broad deployment in at-risk communities and by industry professionals responsible for wastewater monitoring. The team estimates the cost per unit is under two dollars, offering a pathway to routine, on-site testing with disposable sensors. Looking ahead, the researchers plan to adapt their design to address long-term stability and consider transforming the sensor from a liquid-contact to a solid-contact format, further improving its durability against environmental variations like temperature changes. According to the authors, this new technology represents a significant advance in the global effort to tackle perchlorate pollution. By combining precision molecular design with practical field applications, the team's work brings safer water and improved public health one step closer for populations exposed to the risks from industrial and fireworks-related contamination. The full study is open access and can be found in Energy & Environment Nexus, Volume 1, 2025.
