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Hi,
I thought I'd share this post just in case of interest or relevance - perhaps something you've already heard about: https://www.bath.ac.uk/research/news/2014/08/11/electric-bugs-water-sensor/
Scientists from our Department of Chemical Engineering have developed a low-cost device that could be used in developing countries to monitor the quality of drinking water in real time without costly lab equipment.
Current methods of detecting pollutants in water are costly, time-consuming and require specialist technical expertise. However researchers from the University in collaboration with Bristol Robotics Laboratory at the University of the West of England, have created a low cost sensor using 3D printing technology that can be used directly in rivers and lakes for continuous water quality monitoring.
If of interest might be worth following up with them to find out more.