EPA Method 1624

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EPA Method 1624:
Volatile Organic Compounds by GC/MS. Official Name: Method 1624, Revision B: Volatile Organic Compounds by Isotope Dilution GC/MS

Summary:
Stable isotopically labeled analogs of the compounds of interest are added to a 5 mL water sample. The sample is purged at 20-25oC with an inert gas where the volatile organic compounds are transferred from the aqueous phase into the gaseous phase and passed into a sorbent column and trapped. After purging is completed, the trap is backflushed and heated rapidly to desorb the compounds into a gas chromatograph (GC) where they are separated and detected by a mass spectrometer (MS).

Scope:
This method determines the volatile toxic organic pollutants that are amenable to purge and trap gas chromatography-mass spectrometry (GC-MS).

Citation:
EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

Interferences:
(A) Analytical system: Impurities in the purge gas, organic compounds out-gassing from the plumbing upstream of the trap, and solvent vapors can interfere.(B) Sample contamination: Samples can be contaminated by diffusion of volatile organic compounds through the bottle seal during shipment and storage.(C) Carry-over: Rinse the purging device and sample syringe with reagent water between samples.

QC Requirements:
The minimum requirements consist of an initial demonstration of laboratory capability, analysis of samples spiked with labeled compounds to evaluate and document data quality, and analysis of standards and blanks as tests of continued performance.

Maximum Holding Time:
14 days (after collection)

Media:
WATER

Subcategory:
Organic

Concentration:
Not Available.

Sample Prep:
None.

Precision:
-

Detection:
This is a minimum level at which the analytical system shall give recognizable mass spectra (background corrected) and acceptable calibration points.

Revision Number:
40 CFR Part 136, Appendix A (Current Edition)