Kelso, Washington Laboratory Method information displayed is provided for informational purposes only. No warranty express or implied is made as to the website accuracy, completeness, or applicability such as the age of a method and whether or not it applies to your project. Please contact us for assistance. EPA Method The analytes pesticides, herbicides, and organohalides are eluted from the LSE disk or cartridge with small volumes of ethyl acetate and methylene chloride, and this eluate is concentrated by evaporation of some of the solvent. The concentrations of analytes are determined using a fused silica capillary column gas chromatography GC system equipped with an electron capture detector ECD.
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Summary: A 1-L sample is placed into a separatory funnel and extracted with methylene chloride or one of several optional solvents. The extract is dried, concentrated, and the solvent is exchanged to chloroform. Scope: This method can be used to screen for polychlorinated biphenyls PCBs in finished drinking water, raw source water, or drinking water in any treatment stage.
This procedure is applicable to samples containing PCBs as single congeners or as complex mixtures such as weathered, intact, or mixtures of commercial Aroclors. The procedure has only been evaluated using Aroclors and 2-chlorobiphenyl as a source of PCBs.
B Reagent contamination: Use high purity reagents. D Variable solvents: Use the same solvent for each analysis. QC Requirements: Initial demonstration of laboratory capability, initial calibration checks, continuing calibration checks, extract matrix effect evaluation, laboratory reagent blanks LRB , laboratory fortified blanks LFBs , and laboratory fortified samples.
Maximum Holding Time: 14 days. Extracts and perchlorinated extracts up to 30 days.
EPA Method 508A
Digrel One of the methods Recap and shake vigorously by hand for 1 min. The gas will rapidly dissolve in the methanol. Esterify acids with diazomethane as described in Sect. This flexible approach should meet the needs and requirements of nearly all laboratories. PIand other suppliers. Lichtenberg and James E. Obtained in this way, the standard deviation includes normal day-to-day variations, and the MDL will be more realistic.
EPA Method 508.1
After cooling, store glassware inverted or covered with aluminum foil. Inject a known volume between and L at room temperature of the calibration gas at room temperature directly into the purging device with a gas tight syringe. The LRB is used to determine if method analytes or other interferences are present in the laboratory environment, the reagents, or the apparatus. Whenever an interference is noted in the reagent water blank, the analyst should reanalyze the extracting solvent. Budde Many of the nearly organic analytes included in this manual may be identified and measured in drinking water using two or more of the documented analytical methods.
EPA Methods 500 Series
EPA METHOD 508A PDF