Automated Determination of As(III) in Waters with an Electrochemical Sensor Integrated into a Modular Microfluidic System

• Development of a robust electrochemical sensor integrated into a modular microfluidic system with the potential for on-site monitoring of inorganic As(III) species.
• Microfluidic system enabling the automatic sensor calibration, sample uptake, sample preconditioning and eventual As(III) detection.
• Linear system response to As(III) in a concentration range of 1−150 μg L−1, with a detection limit of 0.42 μg L−1 (below the threshold value of 10 μg L−1 set by WHO.
• System validated by measuring As(III) in tap water samples and samples from two Argentinean aquifers.

ACS Sensors, 2019, 4, 3156−3165