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Different orientations of electrodes in electrochemical detection methods: (a) Schematic of an Au–Ag–Au electrode integrated with a microfluidic channel to detect Hg+2 [101]; (b) illustration of a reusable polymer chip for detection of Pb+2 [99]; (c) electrodes printed on a plastic substrate to detect As(III) [102]; and (d) single-walled carbon nanotube (SWCNT) electrodes for As(III) detection [103].
