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phase (5% diphenyl/95% dimethylpolysiloxane, 30
m x 0.25 mm ID, 0.25 µm film thickness, e.g. Thermo
Scientific™ TraceGOLD™ TG-5MS p/n 26098-1420).
The TG-624 column type is a mid-polarity column
ideally suited for the analysis of volatile analytes, whereas
3
Injector, temperature prog.
PTV-LVI
40 °C, 0.1 min (injection phase, @ 100 kPa)
10 °C/min to 80 °C, 0.3 min (@ 200 kPa)
10 °C/min to 110 °C (transfer phase)
14.5 °C/min to 290 °C (cleaning phase)
Split flow
20 mL/min
Solvent vent
open until 0.17 min
closed until 4.17 min
open until end of run
Injection mode, volume
split, 4 µL
Carrier gas, flow
Helium, constant flow 1 mL/min
Oven program
40 °C, 5 min
40 °C/min to 200 °C
200 °C, 5 min
Transfer line temperature
205 °C
Table 1
.
GC Conditions
Ionization
EI, 70 eV
Scan mode, range
SIM,
m/z
76, 78
Acquisition rate
2 scans/s
Ion source temperature
200 °C (optimized for CS
2
S/N ratio)
Table 2. MS Conditions
Figure 3. CS
2
chromatogram, 5 ppb matrix spike calibration.
the TG-5MS column is more commonly used especially
for pesticide analysis and is commonly available in all
laboratories. Both columns were thus tested for the
applicability of the method. Either column can be used
for the DTC analysis.
RT:
0.00 - 2.00
SM:
13G
RT:1 40
55
60
65
70
75
80
85
90
95
100
ndance
.
5
10
15
20
25
30
35
40
45
50
RelativeAbu
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Time (min)
0