Quantitation by Portable Gas Chromatography: Mass Spectrometry of VOCs Associated with Vapor Intrusion

Table 4

Method validation results.

Compound	Mass (m/z)	𝑡𝑅^a (s)	𝑅^2	% RSD	Linear Range (ppbv)	Avg. Response Factor	MDL
							ppbv	mg m^−3	ng sample^−1b
Benzene	78	41	0.999	5.9	0–501	9.03×10^4	3.2	10	0.25
Carbon tetrachloride	117	42	0.999	2.5	0–499	5.11×10^4	2.7	11	0.28
(E/Z)-1,2-Dichloroethylene	96	36	0.987	11.3	0–499	2.40×10^4	12.1	47.9	1.19
Ethyl chloride	66	34	0.990	17.3	0–250	4.14×10^3	16.5	43.6	1.08
Methylene chloride	84	35	0.985	14.1	0–251	1.53×10^4	27.6	96.0	2.38
Trichloroethylene	97	45	0.998	6.8	0–500	2.85×10^4	2.1	11	0.27
Tetrachloroethylene	166	63	0.999	0.8	0–501	9.81×10^4	0.7	4	0.1
Toluene	92	54	0.998	6.8	0–502	7.78×10^4	1.8	6.9	0.17
Vinyl chloride	62	34	0.999	3.3	0–250	1.50×10^4	13	33	0.81
o, m, p-Xylenes	106	82c	0.999	5.3	0–500	6.58×10^4	3.2	13	0.34

aRetention time. bSample concentration time of 15 s at a 99 cm³ min⁻¹ flow rate. cA 𝑡_𝑅 of 82 s with a window wide enough to include all isomeric xylenes.