EPA Method 8031


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EPA Method 8031:
Acrylonitrile by Gas Chromatography

Summary:
Samples are micro-extracted with methyl tert-butyl ether. The extract is then separated by gas chromatography and measured using a Nitrogen/Phosphorus detector.

Scope:
This method determines the concentration of acrylonitrile in water.

Citation:
SW-846 Online: Test Methods for Evaluating Solid Waste, Physical/Chemical Methods

Interferences:
(A) Contamination: Sample contamination may occur by diffusion of volatile organics through the septum seal during shipment and storage. The analysis of field blanks prepared from organic-free reagent water will identify this problem.(B) Method interferences: Contaminants in solvents, glassware, and other sample processing hardware may lead to elevated baselines and/or other interferences in the gas chromatograms. Routine analysis of reagent blanks should be performed as a check for method interferences.(C) Memory Interferences: Carryover may occur whenever high and low concentration samples are analyzed in sequence. For prevention, rinse the sample syringe between samples with solvent. Also, unusually concentrated samples should be followed by the analysis of solvent blank.

QC Requirements:
Analysis of solvents to determine possible interferences with the acrylonitrile peak. If the solvent blanks show contamination, a different batch of solvents should be used. Also, refer to Chapter One and Method 8000 for specific QC procedures.

Maximum Holding Time:
See SW-846 Chapter Four for information.

Media:
WATER

Subcategory:
Organic

Concentration:
Not Available.

Sample Prep:
Method 8031

Precision:
Method accuracy is based on a single laboratory's analysis of acrylonitrile in water over a period of days. After daily GC calibration, duplicate samples and spiked samples were analyzed. Six concentration spikes were used, 3 at 60 ug/L and 3 at 40 ug/L.

Detection:
None.

Revision Number:
Revision 0, September 1994

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TO-15

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