Analysis of ion components derived from particulate matter using ion selective electrodes

Lifelong exposure history (exposome) of particulate matters (PMs) is essential for understanding environmentally induced health risk, however, diversities in PM size, shape and components are a technical barrier to track the exposome. Previously, we reported a PM sensor utilizing water film-based collection and microfluidics-employed ionic current measurement at MicroTAS 2018 [1], which was only applied to analyze non-soluble PMs. Herein, we realized a potentiometry-based methodology for sensing multiple ion components derived from water-soluble PMs via arrayed ion-selective electrodes (ISEs). NO3^-, NH3⁺, and Na⁺ ions extracted from a real PM sample were simultaneously detected and analyzing their contents was achieved.