The handbook emphasizes the importance of accurate chemical analysis methods to determine the composition of plastic and polymer additives. Given the complex nature of these materials, traditional analytical techniques such as gravimetry and titration often fall short. Instead, advanced methods like gas chromatography-mass spectrometry (GC-MS), high-performance liquid chromatography (HPLC), and Fourier-transform infrared spectroscopy (FTIR) have become standard tools in the analytical laboratory. These techniques allow for the precise identification and quantification of both organic and inorganic additives in diverse plastic matrices.