Table 1: Examples of different families of sensors used to form the sensor array in an electronic tongue.

Sensor familyResearch groupExampleReference

Electrochemical, potentiometricLegin (Russia)Determination of heavy metals with an array of chalcogenide membrane sensors[30]
Electrochemical, ISFETsBratov (Spain)Determination of several ions for water characterization[31]
Electrochemical, voltammetricWinquist (Sweden)Characterization of waters with an array of noble metals[32]
Electrical, resistiveMattoso (Brazil)Conducting polymer sensors[33]
OpticalMc.Devitt (USA)Microspheres with immobilized dyes[34]
GravimetricGardner (UK)Surface acoustic wave (SAW) sensors[35]