287 / 302
RT:
0.00 -15.03
SM:
7B
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Time (min)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
RelativeAbundance
819ug/m3
Av.Ht.=293769
409ug/m3
Av.Ht.=195508
191ug/m3
Av.Ht.=113608
82ug/m3
Av.Ht.=63065
55ug/m3
Av.Ht.=49746
Backgground
Av.Ht.=26646
NL:3.04E5
TIC F:+cAPCI
sid=5.00 SRM
ms2 73.000@cid13.00
[42.583-43.583]
MSMEK
METHYL-ETHYL KETONE (MEK)
RT
Syringe
Speed
Aver Height
Background
Subtracted
3.03
OFF
45240
2.38
91628
46388
Methyl-ethyl ketone
RT (min)
Syringe
Speed
Average Height
Background
Subtracted
Response/ISTD
Ratio
Concentration
(µg/m
3
)
5.4 - 6.0
9
293769
267123
5.8
819
7.5 -8.1
7
195508
168862
3.6
409
9.5 - 10.1
5
113608
86962
1.9
191
11.1 - 10.7
3
63065
36419
0.8
82
12.4 - 13.0
1
49746
23100
0.5
55
13.6 - 14.2
OFF
26646
0
0.0
0
Std. Dev. = 1100
(3 x Std. Dev.) =
3300
0.1
6
LOD
ISTD: Acetone d
6
, syringe 1 mL, Speed 2
SRM (
m/z
65
→
m/z
33)
SRM (
m/z
65
→
m/z
33)
Calibration Curve
METHYL-ETHYL KETONE
y = 11.107x
2
+ 77.148x
R
2
= 0.9982
0
100
200
300
400
500
600
700
800
900
0
1
2
3
4
5
6
Ratio (
m/z
73
→
m/z
43)/ISTD
Concug/m
3
7
Figure 5: Reconstructed ion trace for MEK to produce the calibration curve.
Figure 6: Calibration curve for MEK.
Table 6. Quantitative results for MEK, and LOD determination.