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Advances and Gaps in Real-Time Chemical Sensor Systems for Safeguarding U.S. Water Supplies from Emerging Contaminants
Summary
This review of 24 studies looked at new real-time sensors designed to catch contaminants like "forever chemicals" (PFAS), heavy metals, and microplastics in tap water before they reach your glass. The good news: sensors for detecting heavy metals are getting fast and accurate; the bad news: current PFAS sensors aren't yet sensitive enough to detect these chemicals at the low levels considered safe by the EPA, meaning there's still a real gap in our ability to catch these harmful chemicals early. This matters because faster, better detection technology could give communities earlier warnings about contaminated water, but for now, most of
Emerging contaminants including per- and polyfluoroalkyl substances (PFAS), pharmaceuticals, microplastics, and heavy metals pose escalating threats to drinking water safety in the United States. Conventional laboratory-based monitoring methods lack the temporal resolution and rapid response capabilities needed for effective early warning and contamination prevention, creating critical vulnerabilities in water safety infrastructure. This systematic review synthesizes recent advances in real-time chemical sensor technologies for detecting emerging contaminants in drinking water systems. It involves evaluating their analytical performance, field deployment readiness, and translation potential for protecting public water supplies. Following PRISMA guidelines twenty-four (24) studies were analyzed encompassing electrochemical, optical, biosensor, microfluidic, and integrated IoT-based sensing platforms. Data extraction focused on sensor types, target analytes, analytical performance metrics, deployment contexts, and identified limitations. Electrochemical sensors demonstrated detection limits ranging from ng/L to µg/L for heavy metals and arsenic with response times under 10 minutes. Optical methods including surface-enhanced Raman spectroscopy achieved ultra-sensitive detection (pg/L to ng/L) but faced substrate reproducibility challenges. A critical gap emerged in PFAS detection, where current sensors fall 2-3 orders of magnitude short of EPA's 4 ng/L health advisory levels. Field deployment remained limited, with fewer than 30% of technologies reporting real-world testing. Biofouling, calibration drift, and matrix interference emerged as universal challenges. Real-time sensor technologies show considerable progress for heavy metal monitoring and integration with smart water systems. Critical gaps remain in ultra-trace contaminant detection, field validation, and regulatory acceptance pathways. Achieving PFAS detection at regulatory levels represents the most urgent research priority. Successful translation requires coordinated efforts in anti-fouling innovation, standardization, long-term field studies, and policy framework development.