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(a) Nitrate sensor chip with wireless communication interface [113]; (b) experimental set up of low-temperature co-fired ceramics (LTCC)-based continuous flow potentiometric microanalyzer to determine potassium and nitrate [115]; (c) a mobile sensing platform with a plug-n-play microelectronic ionic sensor to detect nitrate [114]; and (d) nTiO2-modified graphene foam (GF)-based nitrate sensor [117].
