EPA METHOD 508A PDF
This kit provides all of the necessary materials to conduct the EPA A test. It can be used to analyze finished drinking water, drinking water in any stage for. EPA Method a – Screening for Polychlorinated Biphenyls by Perchlorination and Gas Chromatography. Analyzer Description. Configuration: 1-capillary. Subsequently, the LabCert program has only offered certification for the analysis of PCBs in drinking water by EPA method A. Method A, and s.
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Solution should be kethod when ongoing QC Section 10 indicates a problem. The analyst should verify appropriate extract holding times applicable to the samples under study. Inability to demonstrate acceptable instrument performance indicates the need for reevaluation of the instrument system.
Accordingly, exposure to these chemicals must be reduced to the lowest possible level.
The system and the operating conditions used to collect these data are as follows: No attempts to establish low detection limits should be made before instrument optimization and adequate conditioning of both the column and the GC system. If, on the other hand, the analyzed unfortified sample is found to contain background concentration, b, estimate the.
Chloroform and methylene chloride have been tentatively classified as known or suspected human or mammalian carcinogens. Diazomethane reaction mixture should be used to esterify only two samples; prepare new reaction mixture in Tube 2 to esterify each two additional samples.
EPA Method 508A
If sample extract reanalysis continues to fail the recovery criterion, report all data for that sample as suspect. The values given are for guidance because slight modifications may be necessary to optimize specific GC systems. The specific practices that are most wpa depend upon the needs of the laboratory and the nature of pea samples.
Poor precision is generally traceable to pneumatic leaks, especially around the sample purger and detector reactor inlet and exit, electronic problems, or sampling and storage problems.
EPA Method a – Screening for Polychlorinated Biphenyls by Perchlorination and Gas Chromatography
Calculate percent breakdown as follows: The trao may be vented to the analytical column during dai y P conditioning; however, the column must be run through the temperature program prior to analysis of samples. Calculate the concentration in micrograms per micro!
The calibration standards must bracket the analyte concentrations found in the sample extracts.
When applicable, determine the relative response of the alternate detector to the analyte. Aqueous standards should be prepared fresh and extracted immediately after preparation unless sealed and stored without headspace as described in Sect.
The standards and extracts must be in MTBE. This detector has proven effective in the analysis of spiked reagent and artificial ground waters. When peaks obviously represent more than one sample component i. Analyte EDLs and analyte recoveries and standard deviation about the percent recoveries at one concentration are given in Table 2.
When potential interfering peaks are noted eap laboratory reagent blanks, the analyst must eliminate the problem before analyzing samples.
The extent of matrix interferences will vary considerably from source to source, depending upon the water sampled. Polychlorinated biphenyls have been classified as known or suspected human or mammalian carcinogens. A reference file of material safety data sheets should also be made available to all personnel involved in the chemical analysis. Method information displayed is provided for informational purposes only. The DCB is extracted with hexane from the reaction mixture; after the extract is purified, an aliquot is injected into a mmethod chromatograph GC equipped with an electron capture detector ECD for separation and measurement.
Purged sample components are trapped in a tube containing suitable sorbent materials. Attach to concentrator tube with springs. Fortify the sample with 50 JtL of the surrogate standard solution.
The following compounds can be determined by this method. Conventional sampling practices 6 should be followed; however, the bottle must not be prerinsed with sample before collection. Reagent water used to generate the validation data in this method was distilled water obtained from the Magnetic Springs Water Metyod. Extract matrix effect evaluation –It has been found that there may be a matrix effect from the perchlorinated extract which can bias the response on certain GC systems.