40 ppb Volatiles in Drinking Water on Rtx-VMS by EPA Method 524.4

	Peaks
1.	Dichlorodifluoromethane
2.	Chlorodifluoromethane
3.	Chloromethane
4.	Vinyl chloride
5.	1,3-Butadiene
6.	Bromomethane
7.	Trichlorofluoromethane
8.	Diethyl ether
9.	1,1-Dichloroethene
10.	Carbon disulfide
11.	Methyl iodide
12.	Allyl chloride
13.	Methylene chloride
14.	trans-1,2-Dichloroethene
15.	Methyl acetate
16.	MTBE-d3 (SS)
17.	MTBE
18.	tert-Butyl alcohol (TBA)
19.	Diisopropyl ether (DIPE)
20.	1,1-Dichloroethane
21.	tert-Butyl ethyl ether (ETBE)
22.	cis-1,2-Dichloroethene
23.	Bromochloromethane
24.	Chloroform
25.	Carbon tetrachloride
26.	Tetrahydrofuran
27.	1,1,1-Trichloroethane
28.	1,1-Dichloropropene
29.	1-Chlorobutane
30.	Benzene
31.	tert-Amyl methyl ether (TAME)
32.	1,2-Dichloroethane
33.	Trichloroethene
34.	1,4-Difluorobenzene
35.	tert-Amyl ethyl ether (TAEE)
36.	Dibromomethane
37.	1,2-Dichloropropane
38.	Bromodichloromethane
39.	cis-1,3-Dichloropropene
40.	Toluene
41.	Tetrachloroethene

	Peaks
42.	trans-1,3-Dichloropropene
43.	1,1,2-Trichloroethane
44.	Ethyl methacrylate
45.	Dibromochloromethane
46.	1,3-Dichloropropane
47.	1,2-Dibromoethane
48.	Chlorobenzene-d5
49.	Chlorobenzene
50.	Ethylbenzene
51.	1,1,1,2-Tetrachloroethane
52.	m-Xylene
53.	p-Xylene
54.	o-Xylene
55.	Styrene
56.	Bromoform
57.	Isopropylbenzene
58.	4-Bromofluorobenzene (SS)
59.	Bromobenzene
60.	n-Propylbenzene
61.	1,1,2,2-Tetrachloroethane
62.	2-Chlorotoluene
63.	1,3,5-Trimethylbenzene
64.	1,2,3-Trichloropropane
65.	4-Chlorotoluene
66.	tert-Butylbenzene
67.	Pentachloroethane
68.	1,2,4-Trimethylbenzene
69.	sec-Butylbenzene
70.	4-Isopropyltoluene
71.	1,3-Dichlorobenzene
72.	1,4-Dichlorobenzene-d4
73.	1,4-Dichlorobenzene
74.	n-Butylbenzene
75.	Hexachloroethane
76.	1,2-Dichlorobenzene-d4 (SS)
77.	1,2-Dichlorobenzene
78.	1,2-Dibromo-3-chloropropane
79.	Hexachlorobutadiene
80.	1,2,4-Trichlorobenzene
81.	Naphthalene
82.	1,2,3-Trichlorobenzene

C. Contamination from nitrogen gas line; * Toluene-d8

GC_EV1351

Column	Rtx-VMS, 30 m, 0.25 mm ID, 1.40 µm (cat.# 19915)
Sample	524.3 Internal standard/surrogate mix (cat.# 30017)
	524.3 Gas calibration mix (cat.# 30014)
	524.3 VOA MegaMix standard (cat.# 30013)
Diluent:	RO water
Conc.:	40 ng/mL (5 mL sample)
Injection	purge and trap split (split ratio 30:1)
Liner:	Premium 1.0 mm ID straight inlet liner (cat.# 23333.1)
Inj. Temp.:	200 °C
Purge and Trap
Instrument:	EST Encon Evolution
Trap Type:	Vocarb 3000
Purge:	11 min, flow 40 mL/min
Dry Purge:	1 min, flow 50 mL/min
Desorb:	1 min @ 260 °C, flow 30.9 mL/min
Bake:	8 min @ 265 °C
Interface Connection:	injection port
Transfer Line Temp.:	150 °C
Oven
Oven Temp.:	45 °C (hold 4.5 min) to 100 °C at 12 °C/min to 240 °C at 25 °C/min (hold 1.32 min)
Carrier Gas	He, constant flow
Flow Rate:	0.9 mL/min
Detector	MS
Mode:	Scan
Scan Program:	Group Start Time (min) Scan Range (amu) Scan Rate (scans/sec) 1 1.5 47–300 5.4 2 2.9 35–300 5.19
Transfer Line Temp.:	240 °C
Analyzer Type:	Quadrupole
Source Temp.:	230 °C
Quad Temp.:	150 °C
Electron Energy:	70 eV
Solvent Delay Time:	1.5 min
Tune Type:	BFB
Ionization Mode:	EI
Instrument	Agilent 7890A GC & 5975C MSD
Notes	Nitrogen was used as the purge gas for the EST Encon Evolution.

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