Discrimination of Pakistani Fountain Pen Inks by Gas Chromatography-Mass Spectrometry (GC-MS)

Table 3

Compounds identified by GC-MS for black fountain pen inks samples: Bk1, Bk2, Bk3, and Bk4.

Ink code	Compound	Retention time (min)	Chemical formula	Relative abundance
Bk1	2,2-Dimethyl-1,3-propanediol	5.841	(C5H12O2)	5.23
	Glycerin	9.579	(C3H8O3)	20.82
	4-(Methylthio)-butanenitrile	10.398	(C5H9NS)	13.14
	Ribitol	12.101	(C5H12O5)	3.53
	Bicine	14.295	(C6H13NO4)	3.43
	1-Napthalenamine	15.643	(C10H9N)	3.47
	Triethanolamine	18.474	(C6H15NO3)	3.44
Bk2	1,5-Hexanediol	5.954	(C6H14O2)	6.89
	2,2-Oxybis-ethanol	6.808	(C4H10O3)	4.57
	2-Hydroxy-benzoic acid	11.230	(C7H6O3)	4.60
	Methylparaben	13.909	(C8H8O3)	4.53
Bk3	2,2-Oxybis-ethanol	7. 098	(C4H10O3)	24.61
	Glycerin	9.57	(C3H8O3)	5.74
	Methyldiethanolamine	13.376	(C5H13NO2)	3.75
Bk4	Phenol	6.33	(C6H6O)	23.84
	2,2-Oxybis-ethanol	7.098	(C4H10O3)	9.05
	Aniline	7.280	(C6H7N)	9.05
	p-Nitro aniline	17.126	(C6H6N2O2)	3.64