Table 1.

Basic information of 10 monoterpenes (MTs) and a reference compound investigated in this study.

Order	Group	Full Name	Short Name	Formula	MW (g/mol)	Density (g/cm3)	Kovats RI b
1		α-pinene	α-PN	C10H16	136.23	0.858	1045
2		Camphene	CMP	C10H16	136.23	0.866	1066
3		β-pinene	β-PN	C10H16	136.23	0.872	1118
4		3-carene	3-CN	C10H16	136.23	0.857	1145
5	Monoterpenes	Myrcene	MRC	C10H16	136.23	0.791	1174
6	(MTs)	α-phellandrene	α-PD	C10H16	136.23	0.850	1176
7		α-terpinene	α-TP	C10H16	136.23	0.837	1177
8		R-limonene	R-LN	C10H16	136.23	0.842	1203
9		γ-terpinene	γ-TP	C10H16	136.23	0.850	1244
10	Alkylbenzene	p-cymene	p-CM	C10H14	134.21	0.860	1280
11	Reference a	Toluene	T	C7H8	92.14	0.870	1040

^aAromatic volatile organic compound;

^bKovats RI values of MTs for polar column (polyethylene glycol as stationary phase) [19].