_______________________        Dexsil Corporation

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Dexsil manufactures test kits and instruments for the detection and measurement of environmental contaminants in soil, oil, and water. Since 1977, we have been a leader in developing easy-to-use, accurate testing devices to make environmental analysis faster and less expensive.

Get the latest on Dexsil products:

PetroFLAG [see below...] Analysis System for Hydrocarbons in Soil
HYDROSCOUT   [see below...] A Quantitative Test For Determining Water Concentration In Oil
L2000 PCB/Chloride Analyzer for the analysis of PCBs and other chlorinated organic compounds in soil and transformer oil
Clor-D-Tect Test Kits for analyzing used oil for chlorinated contaminants
Clor-N-Oil PCB Test Kits for analyzing transformer oil for PCBs.





Quantitative Field Analysis of Hydrocarbons in Soil






















































PetroFLAG Can Be Used to Detect:

  • Diesel Fuel

  • Crude Oil

  • Fuel Oils

  • Kerosene

  • Jet A

  • Motor Oil

  • Grease

  • Transformer Oil

  • Hydrocarbons

  • Other


The PetroFLAG system provides the user with a complete method for analyzing soil samples for the presence of petroleum hydrocarbons. The procedure takes 15 minutes and up to 20 samples can be run concurrently. The complete analysis system is available for under $700 and consumables run about $10 per test.

How PetroFLAG is Used:

Hydrocarbons are detected through a simple three step process. After being weighed out, the soil sample is first extracted with a solvent that effectively removes over 90% of the hydrocarbons present. The resulting extract is then filtered through a unique, non-clogging system that removes all particulate matter, even from clay and other difficult-to-filter samples.

The filtrate is then added to a vial which contains an aqueous development solution. The vial is placed in the meter where a two channel turbidimeter measures the absorbance of the mixture and converts the reading into parts per million of petroleum hydrocarbons. The result is displayed on the unit's LCD readout. The instrument, reagents, vials, and balance are all contained in a carrying case that weighs less than ten pounds.

The PetroFLAG System

PetroFLAG has been available since early 1995 and hundreds of units are in use. Usersinclude state EPAs and DEPs as well as the Department of Energy and the Corp of Engineers. PetroFLAG has received SW-846 draft method approval number 9074 from EPA's Office of Solid Waste.

Required Training:

The PetroFLAG system is designed to be used by those with little or no experience in analytical or field chemistry. You will find that it is easier to use than any other field test you have tried. Users should be aware of QA/QC and safety procedures that are appropriate for field analysis. A free video is available that explains how the system works and provides details on how to run it.

What are PetroFLAG's Uses and Limitations?

PetroFLAG tests for a broad range of hydrocarbons including diesel fuel, kerosene, crude oil, motor oil, hydraulic fluid, grease, transformer oil, and #2,#4, and #6 fuel oils. While the method is not specific for any particular hydrocarbon, if the type of hydrocarbon is known, it may be accurately quantified.

If the hydrocarbon type is unknown, the instrument can be used as a general screen so that no false negative results are generated. The detection range is from 10 to 20000 parts per million. No chlorinated solvents are used in any part of the procedure. Moisture does not affect test results up to saturation (20-25% water). Usable temperature range is from 5C to 45C.

Light hydrocarbons such as fresh gasoline can be detected by PetroFLAG but only at high concentrations (>1000 ppm). It is generally recommended that PetroFLAG not be used for gasoline except as a general screen for high levels.

PetroFLAG does respond to PNAs such as anthracene and creosote and may be used to detect this class of compounds. Response settings have not been determined for PNAs and the response is not as linear as for other hydrocarbons.

The presence of naturally occurring hydrocarbons in soil, eg, vegetable oils, may cause high readings with PetroFLAG. This high bias can be compensated for by calibrating the instrument with a blank soil that contains an equivalent concentration of the naturally occurring material. Such a soil is usually found in an area surrounding the site of concern. PetroFLAG is unaffected by the presence of salt or surfactants. There are no known sources of negative interference for PetroFLAG.

PetroFLAG can be used anywhere

Comparison to Laboratory Methods-

PetroFLAG has been rigorously evaluated against methods 8015B (gas chromatography) and 418.1 (infrared analysis) at actual contaminated sites. As detailed in Evaluation of a New Field Test Kit for Determining Total Petroleum Hydrocarbon Concentrations in Soil at a Site Contaminated by Diesel Fuel by Keith Wright (available from Dexsil), PetroFLAG was compared to both the GC and the IR methods.

The resulting correlations were 89% for 8015B and 92% for 418.1. In a separate study of an oil and grease site (see Evaluation ofa Rapid Field Analytical Test Kit for Assessing Hydrocarbon Soil Contamination, Keith Wright and David Jermstad, available from Dexsil) the correlation between PetroFLAG and 418.1 was shown to be 90% with no false negatives and two false positive results.

Other studies are also available from Dexsil. Laboratory results for both 8015B and 418.1 may vary widely between laboratories because of different preparation and extraction techniques, so, when confirming PetroFLAG results with these methods, make sure that all of the details of the laboratory analysis are known.

[Dexsil, Clor-N-Oil, Clor-D-Tect, Clor-N-Soil, L2000 and PetroFLAG are registered trademarks of Dexsil Corporation.]




A Quantitative Test For DeterminingWater Concentration In Oil

The collection, transport and treatment of used oil can be expensive and difficult. One of the common contaminates of used oil is dissolved water. Water contamination is an economic concern for everyone dealing with used oil because of the added cost associated with handling the water. Dexsil has developed HYDROSCOUT, a test that allows the user to assess the value of the oil before accepting and transporting what might be a large volume of dissolved water.

Each HYDROSCOUT comes with…

HYDROSCOUT is a field portable test that quantifies water concentration in oil over a range of 0-20%, or 0-100%. It's an easy, inexpensive test that can be run by a driver at any pick-up or transfer point during the transportation process. At a cost as low as $3.00 per test HYDROSCOUT is an affordable method to determine the true value of the oil before acceptance.

How does it compare…

Laboratory methods can be expensive, time consuming and cannot be run on-site. Methods such as Karl Fisher require a large capital investment, costly reagents and a chemist or highly qualified technician to run the test. These issues make the Karl Fisher method impractical for companies not equipped for laboratory analysis. Distillation, another method frequently used, can be time consuming and does not provide the accuracy typically required. HydroScout solves all the problems associated with water analysis in used oil.

What level of water can be tested…

HYDROSCOUT is programmed to determine water content over two common ranges. Program A, the most widely used range, covers 0-20%, down to 0.15%v/v. Using the available dilution vials, Program B can be used to measure water content up to 100%. Both programs auto-calibrate and perform quality control checks to minimize false negatives and ensure accuracy.

Results are obtained in less than 2 minutes…

The hand held HYDROSCOUT meter is a fast inexpensive on-site system that quantifies water concentration in used oil. The meter is menu driven for ease of use and has built- in quality control checks and an automated calibration feature.


Draw off a sample using the syringe. Wipe the excess off the syringe. Dispense the sample into the reaction tube

Break the ampule containing the pre-measured reagent and shake.

Insert the reaction tube into the HYDROSCOUT meter. Press the read button and the percentage of total dissolved water is displayed on the LCD screen.


All of the reagents are pre-measured, sealed in breakable glass ampules, and packaged in units of 40 tests (dilution vials, are available separately by the dozen). The rugged design of the meter and the stability of the reagents make it easy to store the system in any vehicle.

To learn more about the HYDROSCOUT or place an order please contact:

Dexsil Corporation
One Hamden Park Drive
Hamden, CT 06517
Phone: 203-288-3509 or 800-433-9745
Fax: 203-248-6523

E-Mail info@dexsil.com


Dexsil and HYDROSCOUT are registered trademarks of Dexsil Corporation.

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