EPA METHOD 508A PDF

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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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Transfer the solvent to the sample contained in the separatory funnel or tumbler bottle, seal, and shake for 10 s, venting periodically. Based upon a literature search 2 such compounds include biphenyl, polyhalogenated biphenyls, hydrogenated biphenyls, and polyhalogenated terphenyls.

The observed magnitude and character of this peak randomly varies in numerical value from successive injections made merhod the same vial.

The sample storage area must be free of organic solvent vapors. Cleanup of sample extracts may be necessary. Winfield – MethodRevision 2.

If the mechanical tumbler is used, pour the entire sample fpa a mfthod bottle. The extract is dried, concentrated, and the solvent is exchanged to chloroform. Prepare single point standards from the secondary dilution standard solutions. The internal standard must be an analyte that is not a sample component. The disks are made of Teflon containing silica which is coated with a chemically bonded C organic phase. The DCB is extracted with hexane from the reaction mixture; after the extract is purified, an aliquot is injected into a gas chromatograph GC equipped with an electron capture detector ECD for separation and measurement.

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免费下载 EPA Method A Screening for Polychlorinated Biphenyls by Perchlorination – WDFXW文档分享网

Remove the mL concentrator tube from the mL evaporative flask and attach a 3-ball micro Snyder column. A sample chromatogram obtained with Column 1 is presented in. If DCB is detected at 0. The column is temperature programmed to separate the method analytes which are then detected with a photoionization detector PID and a halogen specific detector methpd in series.

PCNB has been identified as a suitable internal standard. Data is presented in the method to show that the open split interface can provide acceptable precision, accuracy, and detection limits.

Dilute to volume with MTBE and thoroughly mix the solution. 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. Screw cap test tube — 15 ml with Teflon-lined screw cap.

When a solvent is purified, stabilizers added by the manufacturer are removed thus potentially making the solvent hazardous. The data acquired for measurement of an MDL should be obtained over a period of time several days or more. Ascorbic acid has been extensively tested as a dechlorinating agent, and has been found to be as effective as sodium thiosulfate, but without the undesirable generation of sulfur dioxide at low pH.

Subtracting blank values from sample results is not permitted. In this and subsequent steps, allow the liquid level to just reach the top of the Florisil before applying the next rinse, however, do not allow the Florisil to go dry. methoc

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EPA Method 508A

The system and the operating conditions used to collect these data are as follows: Add 2 ml Diazald solution Sect.

If the tumbler is used, pour contents of tumbler bottle into a separatory funnel. Other GC columns, chromatographic conditions, or detectors may be used if the requirements of Sect. When sufficient internal perfor- mance data becomes available, develop control limits from the mean percent recovery X and standard deviation S of the percent recovery. If the mechanical separatory funnel shaker is used, pour the entire sample into a 2-L separatory funnel.

Interfering contamination may occur when a sample containing low concentrations of volatile organic compounds is analyzed immediately after a sample containing relatively high concentrations of volatile organic compounds. After air drying, the organic compounds are eluted using a very small volume of an organic solvent.

Sample chromatograms for selected pesticides are presented in Figures 1 and 2. These data are presented in Tables 2 and 4. These data are used to establish upper and lower control limits as follows: After wetting the column with about 0.