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 possible, a single supplier will aggregate all standards solutions into a set, and package a set of standards for shipment to each laboratory. Remove epw Snyder column and rinse the glass joint into the receiver with small portions of solvent. Before use, the tubing must be thoroughly rinsed with methanol, followed by repeated rinsing with reagent water to minimize sample contamination.

If a smaller aliquot of soils or mixed- phase samples is analyzed, attempt to assure that the sample is representative. This is intended to ensure that study participants already have the facilities, equipment, and trained staff necessary to implement Method A. EPA anticipates validating the method in wastewater, biosolids, and fish tissue. To preserve confidentiality, laboratories that volunteered for this study, including three that did not submit lab ep, were assigned numbers randomly from 1 to The other aliquot will 1668 as the Method blank.

These concentrations are computed based on the calibration data in Section This included verification that: The sample processing laboratory then shipped the prepared, numbered samples to the participant laboratories via air courier.

Method A Interlaboratory Validation Study Report

Therefore, the number of analyses will be balanced against the need to obtain a sufficient number of participant laboratories. When handling samples suspected or known to contain high concentrations of the CBs, an additional set of gloves can also be worn beneath the latex gloves. If the CBs cannot be measured reliably by isotope dilution, dilute and analyze an aqueous sample or analyze a smaller portion of a soil, tissue, or mixed-phase sample.

Development of accuracy statements is described in Section 9. RSDs are mostly between 10 and 30 percent, as expected, with a few outlying high values. Transfer the solvent to the separatory funnel, and extract the sample by shaking the funnel for 2 minutes with periodic venting. Each laboratory that uses this Method must demonstrate the ability to generate acceptable results using the procedure in Section 9. Be sure not to open the valve so quickly that the sample is blown out of the flask.


EPA Method 1668A

To further e;a study costs, EPA plans to use excess sample volume collected from previous studies of biosolids and fish. To preclude injudicious use of standards, EPA will remind laboratories of the instructions given in Method A for combining and diluting standards. E or equivalent, equipped with a variable temperature water bath 6.

The 13Clabeled CBs are spiked into each sample and allow identification and correction of the concentration of the native compounds in the analytical process. The most frequently encountered interferences are chlorinated dioxins and dibenzofurans, methoxy biphenyls, hydroxydiphenyl ethers, benzylphenyl ethers, brominated diphenyl ethers, polynuclear aromatics, polychlorinated naphthalenes, and pesticides.

The sample is mixed with anhydrous sodium sulfate, allowed to dry for 12 – 24 hours, and extracted for hours using methylene chloride in a Soxhlet extractor.

Prewet the column by adding approximately 0. Drain the hexane layer to the top of the column, but do not expose the sodium sulfate.

It may be used for water extracts that are expected to contain 11668a molecular weight organic compounds e. EPA will also request participation by international laboratories so that study results reflect worldwide application of EPA Method A. In this event, correct the problem, re-prepare, extract, and clean up the sample batch and repeat the ongoing precision and recovery test Section The drip tip should protrude into the test tube to preclude loss of sample from spattering when vacuum is applied.

These lower recovery windows reflect that these congeners are partially lost in the solvent evaporation step s. The acid silica gel Section 7. If you have suggestions for improvement, we would enjoy hearing from you.

Fpa one liter or a larger or smaller volume of sample sufficient to meet project needs. Different lots and types of PFK can contain varying levels of contamination, and excessive PFK or other reference substance may cause noise problems and contamination of the ion source necessitating increased frequency of source cleaning. Exposure to these compounds should be reduced to the lowest possible level. This will assist the laboratory in tracking possible sources of contamination for individual samples, identifying glassware associated with highly contaminated samples that may require extra cleaning, and determining when glassware should be discarded.


One half of the composite was designated as biosolids sample “A” while the other half was used to prepare biosolids sample “B.

US EPA METHOD A/B/C “STARTER KIT” – Cambridge Isotope Laboratories –

See Table 2 in Method A. This fraction will contain the mono- and di-ortho CBs. Pea potassium hydroxide solutions may be employed for back-extraction, provided that the laboratory meets the specifications for labeled compound recovery and demonstrates acceptable performance using the procedure in Section 9.

Once these stored samples were identified, they were forwarded on ice to the sample processing laboratory. So that a sufficient amount of each sample was available to support the study, EPA identified several samples of each matrix epq that could be combined to produce large volumes of Youden pairs with the desired congener distribution.

In selecting the samples, EPA’s objective will be to maximize the number of congeners represented and ensure that the congeners span the anticipated measurement range of the method, ranging from the upper end of the calibration range down to “not detected.

Where possible, reagents are cleaned by extraction or solvent rinse. The five Labeled injection internal standards in 1668x Method are CBs with congener numbers 9, 52, and Cut paper to simulate the surface area of the paper sample being tested.

A total of six cleanup steps were applied to each sample. Reference standards that can be used to determine the accuracy of standard solutions are available from several vendors. Cap the bottle and mix the sample by careful shaking.

PCBs can be ubiquitous in the laboratory environment. This review disclosed the following facts: It is the sum of the concentrations of each individual toxic PCB and each individual 2,3,7,8-substituted, tetra-through octa- chlorinated, dibenzo-p-dioxin and dibenzofuran multiplied by their respective TEFs Reference 1.

Laboratory 6 did not submit tissue data, and reported difficulties with the analysis of this matrix due to interferences from lipids. The laboratory reported results for peaks containing one or more congeners.

Gross losses to the laboratory ventilation system must not be allowed.

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