Compact Electrochemical Flow System for the Analysis of Environmental Pollutants
A compact flow system that includes two electrochemical transducers integrated in a miniaturized cell is reported. Each transducer shows an on-chip thin-film gold three-electrode configuration. The cell was machined on polymethyl methacrylate substrates, together with the required minifluidic elements for sample conditioning and analysis. These include several pumps and valves that enabled the system to work in an automatic fashion. Its performance was assessed by analyzing copper, catechol and parathion, using different chronoamperometric approaches. A rapid and reproducible response, ease of use, simple data interpretation and low maintenance make the system amenable to be implemented in a portable instrument for on-site environmental analysis.