EPA Method A in the EPA methods list database. View all EPA methods. EPA Method A: Chlorinated Biphenyl. Congeners by HRGC/HRMS. Horizon Technology, Inc., Salem, NH. Horizon Technology, Inc., 45 Northwestern Dr. Ecology may require or allow the use of the most current accepted revision of EPA Method (USEPA, ) at contaminated sites, instead.
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If a sufficient number of volunteer laboratories are not identified, EPA may consider issuing contracts with one or more qualified laboratories through a competitive bidding process. Retention time regression analysis may aid in this identification. Eye protection preferably full face shields must be worn while working with exposed samples or pure analytical standards. Start MS data collection after the solvent peak elutes.
US EPA METHOD A/B/C “STARTER KIT” – Cambridge Isotope Laboratories –
The following subsections present plots of absolute precision as standard deviation of the determined concentrations and relative precision as relative standard deviation as functions of congener concentration for each of these matrices. Between samples, three 2- to 3- mL aliquots of solvent should be rinsed down the feed tube into a waste beaker.
Adjust the flow rate of eluantto 4. Remove the Snyder column and rinse the glass joint into the receiver with small portions of solvent. To allow for some loss of data due to error, lost samples, outlier removal, or other unforeseen causes, EPA included 14 participant laboratories in the study.
One of these sources will include existing MDL data generated in reference tissue, solids, and aqueous matrices. The CBs are listed in Table 1.
Extraction with methylene chloride as epq to simple rinsing and baking at a lower temperature may produce sodium sulfate that is suitable for use. Assistance in evaluating the health hazards of particular laboratory conditions may be obtained from certain consulting laboratories and from State Departments of Health or Labor, many of which have an fpa health service. If you have suggestions for improvement, we would enjoy hearing from you. EPA acknowledges the volunteer laboratories that participated in the study and, in particular, those laboratories that took the extra effort to comment on EPA Method A and to provide suggestions for improvements.
The minimum quality control QC 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 16668a and blanks as tests of continued performance.
After the compound is completely dissolved, transfer the solution to a clean mL vial with fluoropolymer-lined cap. Because the instrument is operated in the high-resolution mode, 16688a drifts of a few ppm e. Other applications and matrices may be possible, which may or may not require modifications of sample preparation, chromatography, etc.
Therefore, consistency of the RT and RRT with other congeners and the labeled compounds may be required for rigorous congener identification.
Ideally, the matrix should be free of the CBs, but in no case must the background level of the CBs in the reference matrix exceed the minimum levels in Table 2. Suffix “L” indicates labeled compound 2. Glassware with removable parts, particularly separatory funnels with fluoropolymer stopcocks, must be disassembled prior to detergent washing.
The Method was developed for use in wastewater, surface water, soil, sediment, biosolids and tissue matrices. PCBs can be ubiquitous in the laboratory environment. The procedures and criteria for analysis of a method blank are described in Sections 9. If the size of the largest particles is greater than 1 mm, the particle size must be reduced to 1 mm or less prior to extraction using the procedures in Section Grind the sample aliquots from Sections Lipids must be removed by an anthropogenic isolation column procedure, followed by the gel permeation chromatography procedure as described in the method.
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Extract the apparatus for a minimum of 3 hours. The RSDs generally are higher than those in Method A for some of the low molecular weight congeners, and lower for some of the other congeners.
Reference 20 describes calculation of an EMDL. This will assist the laboratory in tracking possible sources of contamination for individual samples, identifying rpa associated with highly contaminated samples that may require extra cleaning, and determining when glassware should be discarded. All portions of the column that connect the GC to the ion source should remain at or above the interface temperature specified above during analysis to preclude condensation of less volatile compounds.
Disclaimer Mention of trade names or commercial products does not constitute endorsement or recommendation for use. All samples must be associated with an uncontaminated Method blank before the results for those samples may be reported or used for permitting or regulatory compliance purposes.