Table 2.

Advantages and disadvantages of gas chromatography and sensor arrays.

Analysis Method	Advantages	Disadvantages
Gas chromatography	Enables qualitative and quantitative analysis at the same time High repeatability, reproducibility and accuracy Possibility to identify all compounds present in the mixture High resolution	Limited measuring ranges and resulting from them a limit of quantification of individual compounds Impossible to predict interactions between components The necessity to store and transport of the samples The representativeness and integrity of a sample depends on many factors High costs
Gas sensor arrays	Enables continuous process monitoring Sensor array in the form of easily replaceable modules Uniqueness of the generated signal (a different signal for each tested mixture) Low costs Easy sensors calibration	No qualitative analysis possible High influence of temperature and humidity on measurement stability Multidimensionality of the generated signal (requires averaging using statistical methods) Complicates signal identification system (graphic methods, analytical procedures, neural network)