EPA Method 8270D

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EPA Method 8270D:
Semivolatile Organic Compounds by GC/MS. Official Name: Semivolatile Organic Compounds by GC/MS

The samples are prepared for analysis by gas chromatography/mass spectrometry (GC/MS) using the appropriate sample preparation (refer to Method 3500) and, if necessary, sample cleanup procedures (refer to Method 3600). The semivolatile compounds are introduced into the GC/MS by injecting the sample extract into a gas chromatograph (GC) with a narrow-bore fused-silica capillary column. The GC column is temperature-programmed to separate the analytes, which are then detected with a mass spectrometer (MS) connected to the gas chromatograph. Analytes eluted from the capillary column are introduced into the mass spectrometer via a jet separator or a direct connection. Identification of target analytes is accomplished by comparing their mass spectra with the electron impact (or electron impact-like) spectra of authentic standards. Quantitation is accomplished by comparing the response of a major (quantitation) ion relative to an internal standard using a five-point calibration curve.NOTE: This method can be used in conjunction with the following sample preparation procedures:Air (particulates and sorbent resin)- Method 3542Water (including TCLP leachates) - Methods 3510, 3520, 3535Soil/sediment - Methods 3540, 3541, 3545, 3546 3550, 3560, 3561Waste - Methods 3540, 3541, 3545, 3546, 3550, 3560, 3561, 3580

Method 8270 is used to determine the concentration of semivolatile organic compounds in extracts prepared from many types of solid waste matrices, soils, air sampling media and water samples. Direct injection of a sample may be used in limited applications.

SW-846 Update IVA

(1) Contaminants from glassware.(2) Matrix interferences that are co-extracted with sample.(3) Contamination by carryover can occur whenever high-concentration and low-concentration samples are sequentially analyzed. To reduce carryover, the sample syringe must be rinsed with solvent between sample injections. Whenever an unusually concentrated sample is encountered, it should be followed by the analysis of solvent to check for cross-contamination.

QC Requirements:
See SW-846 Method 8000 and 3500. Procedures include: validation of sample preparation, introduction, and analysis, initial demonstration of proficiency, calibration verification, evaluation of retention times, analysis of method blanks, matrix spikes, duplicates, surrogates, and laboratory control samples.

Maximum Holding Time:
Aqueous samples - 7 days (sample), 40 days (extract). Solid samples - 14 days (sample), 40 (extract). Also, see SW-846 Chapter Four for information.



None given.

Sample Prep:
See Method Summary

The precision and accuracy values were determined using regression equations derived from a 15 laboratory validation study. The study determined analytes using reagent water, drinking water, surface water, and industrial wastewaters with additions at six concentrations over the range 5 to 1300 ug/L. Single operator precision, overall precision, and accuracy were found to be directly related to the concentration of the parameter and essentially independent of the sample matrix.

EQLs are estimated quantitation limits.

Revision Number:
Revision 4.0, January 1998