An Exploration on the Suitability of Airborne Carbonyl Compounds Analysis in relation to Differences in Instrumentation (GC-MS versus HPLC-UV) and Standard Phases (Gas versus Liquid)

Table 1

Basic information of the target carbonyl compounds (CC) selected in this study.

Order	Name		Molecular formula	MW (g/mole)	Density (g/mL) (STP)	Retention time (𝑅𝑡) (minutes)		Structure
	Full name	Short name				HPLC^a	GC-MS
1	Formaldehyde	FA	HCHO	30.03	1.083 (aq)	3.2	—
2	Acetaldehyde	AA	CH3CHO	44.05	0.788 (l)	3.8	5.6
3	Propionaldehyde	PA	CH3CH2CHO	58.08	0.798 (l)	4.8	7.7
4	Butyraldehyde	BA	CH3CH2HCH2CHO	72.11	0.817 (l)	6.2	8.2
5	Isovaleradehyde	IA	(CH3)2CHCH2CHO	86.13	0.8209 (l)	7.9	8.6
6	Valeraldehyde	VA	CH3(CH2)3CHO	86.13	0.8095 (l)	8.3	10

aRetention time based on the mobile phase composition of ACN : water (70 : 30) used in this study.