## 2 Results
### HS-GC-IMS Analysis
#### 2.1.1 The HS-GC-IMS Qualitative Analysis of VOCs
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Compounds** & **Formula** & **RI 1** & **RT 2 [s]** & **DT 3 [ms]** & **CAS** \\ \hline \hline \multicolumn{5}{c}{Terpenoids} \\ \multicolumn{5}{c}{limonene (d)} & C\({}_{10}\)H\({}_{16}\) & 1027.1 & 613.85 & 1.28735 & 138-86-3 \\ \multicolumn{5}{c}{limonene (m)} & C\({}_{10}\)H\({}_{16}\) & 1025.1 & 608.277 & 1.64831 & 138-86-3 \\ \multicolumn{5}{c}{d-camphor} & C\({}_{10}\)H\({}_{16}\)O & 1137.1 & 1000.58 & 1.84257 & 464-49-3 \\ \multicolumn{5}{c}{beta-pinene} & C\({}_{10}\)H\({}_{16}\) & 972.2 & 483.778 & 1.21748 & 127-91-3 \\ alpha-phalendrene & C\({}_{10}\)H\({}_{16}\) & 991.9 & 525.443 & 1.2135 & 99-83-2 \\ \multicolumn{5}{c}{1-menthol (m)} & C\({}_{10}\)H\({}_{20}\)O & 1172.8 & 1172.199 & 1.87632 & 2216-51-5 \\ \multicolumn{5}{c}{1-menthol (d)} & C\({}_{10}\)H\({}_{20}\)O & 1174.1 & 1178.76 & 1.25862 & 2216-51-5 \\ \multicolumn{5}{c}{Alcohols} \\ \multicolumn{5}{c}{linalool} & C\({}_{10}\)H\({}_{18}\)O & 1102.8 & 858.912 & 1.21718 & 78-70-6 \\ \multicolumn{5}{c}{1-phenylethanol} & C\({}_{6}\)H\({}_{8}\)O\({}_{3}\) & 1059.5 & 708.841 & 1.19687 & 98-86-2 \\ \multicolumn{5}{c}{3-heptanol} & C\({}_{7}\)H\({}_{16}\)O & 901.5 & 359.303 & 1.3301 & 589-82-2 \\ \multicolumn{5}{c}{3-furanmethanol} & C\({}_{5}\)H\({}_{6}\)O\({}_{2}\) & 975.6 & 490.8 & 1.10433 & 4412-91-3 \\ \multicolumn{5}{c}{2-hexanol} & C\({}_{6}\)H\({}_{14}\)O & 813.5 & 254.742 & 1.57558 & 626-93-7 \\ \multicolumn{5}{c}{2-furanmethanol,5-methyl-(m)} & C\({}_{6}\)H\({}_{8}\)O\({}_{2}\) & 954.4 & 448.858 & 1.55977 & 3857-25-8 \\ \multicolumn{5}{c}{2-furanmethanol,5-methyl-(d)} & C\({}_{6}\)H\({}_{8}\)O\({}_{2}\) & 959.4 & 458.318 & 1.25549 & 3857-25-8 \\ \multicolumn{5}{c}{1-octet-3-olol} & C\({}_{8}\)H\({}_{16}\)O & 983.9 & 508.084 & 1.15751 & 3391-86-4 \\ \multicolumn{5}{c}{(Z)-3-hexen-1-olol} & C\({}_{6}\)H\({}_{12}\)O & 851.3 & 294.963 & 1.51428 & 928-96-1 \\ \multicolumn{5}{c}{Phenols} \\ \multicolumn{5}{c}{p-cresol} & C\({}_{7}\)H\({}_{8}\)O & 1084.6 & 792.197 & 1.1635 & 106-44-5 \\ \multicolumn{5}{c}{2,6-dichlorophenol} & C\({}_{6}\)H\({}_{4}\)Cl\({}_{2}\)O & 1204.1 & 1347.154 & 1.20289 & 87-65-0 \\ \multicolumn{5}{c}{Aldehydes} \\ \multicolumn{5}{c}{trans-2-Hexenal} & C\({}_{6}\)H\({}_{10}\)O & 825 & 266.352 & 1.52158 & 6728-26-3 \\ \multicolumn{5}{c}{trans-2-pentenal (m)} & C\({}_{5}\)H\({}_{8}\)O & 753.8 & 199.608 & 1.35623 & 1576-87-0 \\ \multicolumn{5}{c}{trans-2-pentenal (d)} & C\({}_{5}\)H\({}_{8}\)O & 753.8 & 199.608 & 1.10847 & 1576-87-0 \\ \multicolumn{5}{c}{Nonanal} & C\({}_{9}\)H\({}_{18}\)O & 1106.1 & 871.718 & 1.47192 & 124-19-6 \\ \multicolumn{5}{c}{5-methyl-2-} \\ \multicolumn{5}{c}{furancarboxaldehyde} & C\({}_{6}\)H\({}_{6}\)O\({}_{2}\) & 936.7 & 416.718 & 1.1367 & 620-02-0 \\ \multicolumn{5}{c}{2-formyl-5-methylthiophene} & C\({}_{6}\)H\({}_{6}\)OS & 1117.4 & 916.415 & 1.15464 & 13679-70-4 \\ \multicolumn{5}{c}{2,4-heptadieneal} & C\({}_{7}\)H\({}_{10}\)N\({}_{2}\) & 1001.5 & 547.827 & 1.62004 & 5910-85-0 \\ \multicolumn{5}{c}{(E)-hept-2-enol} & C\({}_{7}\)H\({}_{12}\)O & 959.3 & 458.146 & 1.66579 & 18829-55-5 \\ \multicolumn{5}{c}{benzaldehyde} & C\({}_{7}\)H\({}_{6}\)O & 959 & 457.688 & 1.14877 & 100-52-7 \\ \multicolumn{5}{c}{(E)-2-Hexenal} & C\({}_{6}\)H\({}_{10}\)O & 851.5 & 295.153 & 1.18069 & 6728-26-3 \\ \multicolumn{5}{c}{2,4-Hexaalen, (E,E)-} \\ \multicolumn{5}{c}{Esters} \\ \multicolumn{5}{c}{methyl 3-methylbutanoate} & C\({}_{6}\)H\({}_{12}\)O\({}_{2}\) & 764.7 & 209.149 & 1.5252 & 556-24-1 \\ \multicolumn{5}{c}{Isopentyl isovalerate} & C\({}_{10}\)H\({}_{20}\)O\({}_{2}\) & 1116.7 & 913.692 & 2.03768 & 659-70-1 \\ \multicolumn{5}{c}{ethyl butanoate} & C\({}_{6}\)H\({}_{12}\)O\({}_{2}\) & 790.2 & 232.779 & 1.55819 & 105-54-4 \\ \multicolumn{5}{c}{ethyl benzoate} & C\({}_{6}\)H\({}_{10}\)O\({}_{2}\) & 1142.7 & 1025.57 & 1.25881 & 93-89-0 \\ \multicolumn{5}{c}{ethyl acetate} & C\({}_{4}\)H\({}_{8}\)O\({}_{2}\) & 617.2 & 122.892 & 1.33577 & 141-78-6 \\ \multicolumn{5}{c}{benzyl acetate} & C\({}_{9}\)H\({}_{10}\)O\({}_{2}\) & 1128.1 & 961.307 & 1.32321 & 140-11-4 \\ \multicolumn{5}{c}{Acids} \\ \multicolumn{5}{c}{3-methylbutanoic acid} & C\({}_{5}\)H\({}_{10}\)O\({}_{2}\) & 849 & 292.352 & 1.48126 & 503-74-2 \\ \multicolumn{5}{c}{Ketones} \\ \multicolumn{5}{c}{nonan-2-one} & C\({}_{9}\)H\({}_{18}\)O & 1095.5 & 831.727 & 1.40358 & 821-55-6 \\ \multicolumn{5}{c}{cyclohexanone (m)} & C\({}_{6}\)H\({}_{10}\