s-xEPA
United States
Environmental Protection
Agency
EPA/540/MR-95/518
August 1995
SUPERFUND INNOVATIVE
TECHNOLOGY EVALUATION
Demonstration Bulletin
Clor-N-Soil PCB Test Kit L2000 PCB/Chloride Analyzer
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Dexsil Corp.
Technological Description: DEXSIL CORP(Environmental Test
Kits)The Dexsil Corporation (Dexsil) produces two test kits that
detect polychlorinated biphenyls (PCB) in soil: the Dexsil Clor-N-
Soil PCB Screening Kit, and the Dexsil L2000 PCB/Chloride
Analyzer. The Dexsil Clor-N-Soil PCB Screening Kit extracts
PCBs from soil and dissociates the PCBs with a sodium reagent,
freeing chloride ions. These ions then react with mercuric ions to
form mercuric chloride compound. The extract is then treated
with diphenylcarbazone, which reacts with free mercuric ions to
form a purple color. The less purple the color, the greater the
concentration of PCBs in the extract.
The Dexsil L2000 PCB/Chloride Analyzer also extracts PCBs
from soil and dissociates the PCBs with a sodium reagent,
freeing chloride ions. The extract is then analyzed with a cali-
brated chloride-specific electrode. The L2000 instrument then
translates the output from the electrode into parts per million
(ppm) PCB concentration.
Waste Applicability: These technologies produce analytical re-
sults at different data quality levels. The Clor-N-Soil PCB Screen-
ing Kit identifies samples above or below a single concentration,
which is generally tied to regulatory action levels. The Dexsil
L2000 PCB/Chloride Analyzer quantifies specific concentrations
of PCBs in a sample over the range of 2 to 2000 ppm. The
applicability of these methods depends on the data quality needs
of a specific project. Both technologies can be used on site for
site characterization or removal action.
The Dexsil Clor-N-Soil PCB Screening Kit and the Dexsil L2000
PCB/Chloride analyzer can detect PCB concentrations in soil,
sediment, and transformer oils.
Demonstration Results: These test kits were demonstrated at a
PCB-contaminated facility in EPA Region 7. One hundred and
forty four soil samples were collected and analyzed on site using
the Dexsil test kits. Soil samples were not dried prior to analysis.
Split samples were submitted to the offsite formal laboratory for
confirmatory analysis by SW-846 Method 8080. Demonstration
data were used to evaluate the accuracy and precision of the test
kits, relative to internal quality control samples and to formal
laboratory data. This demonstration evaluated costs, ease of use,
ruggedness and other operational aspects of the technology.
The sampling and field analyses for this technology demonstra-
tion were completed in August 1992.
The L2000 is best suited for use at sites where the Aroclor of
concern is known and where interferents are known to be absent.
During the demonstration the Clor-N-Soil Test Kit produced 87
correct assays, 58 false positives, and one false negative.
An Innovative Technology Evaluation Report (ITER) describing
the complete demonstration will be available in late 1995.
Acknowledgment: This Bulletin was prepared for the U.S. Envi-
ronmental Agency, Office of Research and Development, Na-
tional Risk Management Research Laboratory, Cincinnati, OH
45268.
For Further Information:
EPA Project Manager:
Jeanette Van Emon
U.S. EPA ,
Exposure Research Laboratory
944 East Harmon :
P.O. Box 93478 !
Las Vegas, NV 89193-3478
702-798-2154
Technology Developer Contact:
Steve Finch
Dexsil Corporation
One Hamden Park Drive
Hamden, CT06517
203-288-3509
Fax: 203-248-6235
Printed on Recycled Paper
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United States
Environmental Protection Agency
National Risk Management Research Laboratory (G-72)
Cincinnati, OH 45268
Official Business
Penally for Private Use
$300
BULK RATE
POSTAGE & FEES PAID
EPA
PERMIT No. G-35
EPA/540/MR-95/518
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