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

1.Tetrahydrofuran-d8 (IS)
2.Co-extracted material
3.1,4-Dioxane-d8 (SS)
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)
Standard/SampleTetrahydrofuran-d8 (cat.# 30112)
1,4-Dioxane-d8 (cat.# 30614)
1,4-Dioxane (cat.# 30287)
Conc.:0.5 pg/µL (IS/SS 10 pg/µL) in extract
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 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
SIM Program:
GroupStart Time
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
Sample PreparationA 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).