Detection of polychlorinated biphenyls (PCBs) in concrete using the dtech test system

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MATRIX: Concrete

ANALYTES: Polychlorinated biphenyls (PCBs)

RANGE OF DETECTION:
DTECHTOR: 500 ppb to 25 ppm (as aroclor 1254). Color Card: 1 ppm to 25 ppm (as aroclor 1254)

MATERIALS:
DTECH PCB Test Kit. DTECH PCB Sample Extraction Kit. Reagents: table salt (sodium chloride) or salt packets used by restaurants (e.g. Dixie. CrystalsÒ Salt, Savannah Foods & Industries, Inc., Savannah, GA). Equipment: Electric hand or hammer drill with masonry drill bit (¾” bit recommended), 1/16 teaspoon (for measuring table salt). DTECHTOR meter (optional)

SAMPLE PREPARATION:
Caution: Wear safety glasses and a dust mask for this procedure. Concrete structures, walls, floor or slabs. Sample concrete by drilling holes and collecting the residual powder or dust. Three holes drilled to a depth of 1” with ¾” bit will generate at least 10 grams of powder, twice the amount of sample required for extraction and analysis. The analyst should determine how to sample an area for contamination area, that is, the number of samples to collect and the depth of sampling (drilling).

EXTRACTION AND ANALYSIS:
Concrete powder (dust) can be extracted and analyzed as “soil” in the package insert of the DTECH PCB Sample Extraction Kit User’s guide. In this procedure, add approximately 0.25 g of salt (the equivalent of half a salt packet or 1/16th teaspoon) to the soil extraction jar along with the 4.5g concrete dust sample.. The diluted extract is measured as “sample” according to the package insert of the DTECH PCB Test Kit.

INTERPRETATION:
Calculate the concentration in the concrete sample by using the color card supplied with the kit or the DTECHTOR and the table in the “Interpretation” section of the test kit instruction guide. The levels will be the same as for soil samples.

PROCEDURAL NOTES:
The DTECH PCB test kit will also react to other PCB aroclors. Please refer to the Specificity chart in the test kit instruction guide for detailed reactivities. Do not use reagents or components from one test kit with reagents or components from another. Do not use the test kits beyond the expiration date. Store at less than 80 degrees F and run procedure out of direct sunlight.

EXPECTED RESULTS:
See U.S. EPA SW-846 Method 4020 for PCB analysis in soil. Recoveries of PCBs will vary depending on the mechanism of retention of the PCBs, the nature of the solvent, the apparatus used in the extraction, the length of the extraction period and the levels of potentially interfering substances in the concrete sample.

AVAILABILE FROM SDI:
Part Number - Description
TK-1002S-1 DTECH PCB Sample Extraction Kit (4 test)
TK-1002-1 DTECH PCB Test Kit (4 test)
TK-1001M-1 DTECHTOR meter

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