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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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If any value falls outside of this range, then the instrument is not being operated within an acceptable linear range and the sample volume injected must be adjusted accordingly. Caution must be taken in the determination of endrin since it has been reported that the splitless injector may cause endrin degradation 7. Use a glass rod to eoa any caked sodium sulfate during the transfer. Each time a set of samples is extracted or reagents are changed, a LRB must be analyzed.

It appears to be related to di butyl phthalate; however, the specific source has not yet been definitively determined. Do not use less than 20 jil of the secondary dilution standard solution to produce a single point calibration standard in reagent water.

Solution should 058a replaced when ongoing QC Section 10 indicates a problem. When traps containing combinations of silica gel and coponut charcoal are used, residual water from previous analyses collects in the trap and can be randomly released into the analytical column.


The following organohalides are recommended for this purpose: Thoroughly clean glassware, including baking or solvent rinse. Let the sample sit at room temperature for 1 hr, shaking the separatory funnel and contents periodically. Poor precision is generally traceable to pneumatic leaks, especially around the sample purger or to an improperly adjusted lamp intensity power. The standards and extracts must be in MTBE.

Alternative columns may be used in accordance with the provisions described in Sect.

If those steps do not reveal the cause of the problem, reanalyze the extract. Store at room temperature in a hood for 30 min.


Allow the liquid to just reach the top of the Florisil. A dirty injector insert will cause the late eluting compounds to drop off. It is also recommended for use only with a purge and trap system devoted to the analysis of low level samples. Dechlorination with sodium thiosulfate at time of collection will retard further oxidation of these compounds.

EPA Method 508A

If the emulsion interface methood layers is more than one third the volume of the solvent layer, the analyst must employ e;a techniques to complete the phase separation.

With a syringe, add 1 mL of the concentrate to each of at least four 1-L aliquots of reagent water, and analyze each aliquot according to procedures beginning in Section The best standard should represent analyte concentrations near, but above, the respective EDL.


Discard the contents contained in the neck of the flask. Look for the degradation products of endrin endrin ketone and endrin aldehyde.

The GC system may be calibrated using either the internal standard technique Sect. The primary dilution standards should be prepared at concentrations that can be easily diluted to prepare aqueous calibration solutions Sect.

Cap liners are cut to fit from sheets Pierce Catalog No. Block digestor — 1. Therefore caution is needed when applying these methods to matrices other than relatively clean water. Prepare single point standards from the secondary dilution standard solutions.

Results are calculated and reported for each listed analyte as the total free acid. Microextraction and Gas Chromatography. Sodium sulfate — ACS granular, anhydrous.

Decachlorobiphenyl, A / Reference Standards / Chromatography Products at

The container must be washed and dried as described in Sect. Carefully fill the duplicate sample bottles from the 1-gal bottle. The analyst must further demonstrate that the measurement of the internal standard is not affected by method or methld interferences.