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1,4-Dioxane in Drinking Water (5 pg On-Column) on Rxi-624Sil MS (Extracted Ion Chromatogram)

GC_EV1263
Peaks
1.Tetrahydrofuran-d8 (IS)
2.Co-extracted material
3.1,4-Dioxane-d8 (SS)
4.1,4-Dioxane
5.Co-extracted material
ColumnRxi-624Sil MS, 30 m, 0.25 mm ID, 1.40 µm (cat.# 13868)
using Rxi guard column 5 m, 0.25 mm ID (cat.# 10029)
with Universal Press-Tight connectors (cat.# 20429)
SampleTetrahydrofuran-d8 (cat.# 30112)
1,4-Dioxane-d8 (cat.# 30614)
1,4-Dioxane (cat.# 30287)
Diluent:Dichloromethane
Conc.:0.5 pg/µL (IS/SS 10 pg/µL) in extract
Injection
Inj. Vol.:10 µL splitless (hold 1 min)
Liner:Premium 4 mm single taper w/wool (cat.# 23303.5)
Inj. Temp.:120 °C
Purge Flow:80 mL/min
Oven
Oven Temp.:35 °C (hold 1 min) to 120 °C at 12 °C/min (hold 1 min)
Carrier GasHe, constant flow
Flow Rate:1.4 mL/min
Linear Velocity:30.556 cm/sec @ 35 °C
DetectorMS
Mode:SIM
SIM Program:
GroupStart Time
(min)
Ion(s) (m/z)Dwell (ms)
15.046,78,80 50
25.8596,88,64,62,58 40
Transfer Line Temp.:280 °C
Analyzer Type:Quadrupole
Source Temp.:230 °C
Quad Temp.:150 °C
Solvent Delay Time:5.0 min
Tune Type:BFB
Ionization Mode:EI
InstrumentAgilent 7890A GC & 5975C MSD
NotesA drinking water sample fortified with 1,4-dioxane and surrogate standard was extracted using a Resprep activated coconut charcoal SPE cartridge (cat.# 26032) following EPA Method 522 protocol. Immediately after solvent elution, the extract was spiked with internal standard and brought up to final volume. The extract was then dried with anhydrous magnesium sulfate (this was a deviation from the method, which calls for sodium sulfate).