Arsenic and other pollutants are often present in trace amounts in drinking water in a number of
countries. In aqueous solutions the sensitivity of arsenic-responsive bacterial bioreporters is far better
than the performance of chemical field test kits. However, biological detection currently requires
extensive handling and expensive fluorescence microscopy. We fabricated and tested microfluidic chips
with fluorescent (GFP) E. coli bacteria that respond to arsenic. Measurement results of fluorescence
intensity as function of arsenic concentration and exposure time are promising, showing a clear response
to concentrations of 50 μg/l of arsenite.