Integrated multisensor chip with sequential injection technique as a base for “electronic tongue” devices

The system composed by an “electronic tongue” device based on the multisensor ion selective field effect transistor (ISFET) array, sequential injection analysis (SIA) and partial least squares (PLS) method for data processing is shown to offer an automation of the analysis of multicomponent liquids. Along with these the system carried a custom-made flow cell for the sensor array and a cell for mixing liquid samples. The system was used for analysing of the mineral water components (sodium, potassium and chloride). The precision of the ion determination in samples was typical for potentiometric method with standard deviation of about 3–5%. Proposed approach could be applied for automatic analysis in cases when a number of the multicomponent calibration solutions is required to analyse real samples.