## 3 Results and Discussion
### Can Coatings Analysis via GC after a Solvent Extraction
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Tr/min** & **Compound** & **CAS** & **Fl No.** & **SI** & **RSI** & **Sample(s)** & **TC** \\ \hline
20.72 & Butyl octyl phthalate & 84-78-6 & 714 & 758 & BC02 & 1 \\ \hline
20.99 & Ketone structure & & & & BC05, BC07 & \\ \hline
21.53 & Unknown compound \(m/z\) (45, 109) & & & & BC05 & \\ \hline
21.73 & 2-Isobutyl-5-propylthiophene & 4861-63-6 & & & & BC01–BC06, & III \\ \hline  & 7,9-D-iter-butyl-1 & & & & & BC05 & III \\
21.99 & oxaspiro[4,5]deca-6,9-diene-2,8-dione & & & & & BC05 & III \\ \hline
22.33 and 23.3 & Unknown compound (Phthalate & & & & BC02, BC05, BC07 & \\ structure \(m/z\): 149) & & & & & & \\ \hline
23.81 & Unknown compound (\(m/z\) 151) & & & & BC06–BC08, BC10 & \\ \hline
25.08 & Unknown compound (\(m/z\) 151) & & & & BC01, BC02, BC04, & \\ \hline
25.56 & Unknown compound (\(m/z\) 129, 111) & & & & BC08–BC10 & \\ \hline
25.56 & Unknown compound (\(m/z\) 129, 111) & & & & BC01–BC010 & \\ \hline
25.53 & Unknown compound (\(m/z\) 163) & & & & BC08, BC10 & \\ \hline
27.19 & \(\alpha\)-Methyl-5-oxo-2-phenyl-1,3-dioxolane-2-heptanetitrile & 58422-90-5 & 782 & 940 & & BC02, BC05, BC07, & III \\ \hline
27.42 & Hexa(methoxymethyl)melamine & 68002-20-0 & 857 & 874 & & BC01–BC03, BC05, & III \\ \hline
27.87 & Unknown compound (\(m/z\) 143, 111) & & & & BC08 & \\ \hline
28.4 & Unknown compound (Phthalate & & & & BC02, BC05, BC07, & \\ structure \(m/z\) 149) & & & & BC09, BC10 & \\ \hline
29.96 & Unknown compound (\(m/z\) 301) & & & & BC02, BC05, & \\ \hline
30.46 & Unknown compound (\(m/z\) 69, 81) & & & BC08 & \\ \hline
32.45 & Unknown compound (\(m/z\) 345) & & & BC02, 5 BC0, & \\ \hline
35.36 & Unknown compound (Phthalate & & & BC02, BC05, BC010 & \\ structure \(m/z\): 149) & & & & BC02, BC05, BC09 & \\ \hline
35.95 & Unknown compound (\(m/z\) 389) & & & BC02, BC05, BC09 & \\ \hline \end{tabular}
\end{table} 
Table 3: \(Cont.\)are plasticizers and also polyester resins and dyes [31]. This compound has been classified as high toxicity (Class III), according to Cramer rules. Besides, it can be part of a curing agent system used during the manufacturing of an epoxy resin [32]. Other compounds identified include 2-oxepanone and hexa(methoxymethyl)melamine. The lactone has been reported as a degradation product of polyurethane and in this study the analysis was carried out by pyrolysis-gas-chromatopraphy/mass spectrometry [33], and hexa(methoxymethyl)melamine is widely employed as a cross-linking agent in coatings [34]. This compound belongs to Class III, according to Cramer rules. A NIAS compound, specifically 7,9-di-tert-butyl-1-oxaspiro[4,5]deca-6,9-diene-2,8-dione (Figure 2), was identified in sample BC05 and it presents high toxicity (Class III). This compound has been reported as a degradation product of the antioxidant Irganox 1010 and has been found in several samples of both plastic and paper packaging and in polyurethane adhesives [35; 36]. In plastic materials the analyte was determined in aqueous extracts using the purge and trap method combined with GC-MS [36]. For some compounds, despite their high abundance, identification was not possible with the spectral libraries available, such as the compounds at 28.4 min (\(m/z\) 149, which is the characteristic mass of phthalates compounds), 29.97 min (\(m/z\) 301), 32.45 min (\(m/z\) 345), 35.37 min (\(m/z\) 149), and 35.95 min (\(m/z\) 389). Detailed information about the mass spectra of the unidentified compounds is available in the electronic Supplementary Material.