Sitelab Corporation

Case study - GRO in soil at gasoline UST site

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These case studies show the performance using Sitelab’s UVF-3100 analyzer testing gasoline range organic hydrocarbons.  This includes benzene, xylene, BTEX and other volatile petroleum compounds in the GRO or VPH C6 to C10 hydrocarbon range.

When calibrated using Sitelab's GRO calibration kit (CAL-025), the UVF analyzer produces test results that correlate well to laboratory regulatory methods using GC instrumation.  Both the UVF-3100A and UVF-3100D models are fitted with special optical filters sensitive to hydrocarbons commonly found in gasoline, jet fuel, diesel fuel, gas condensates and many other light-refined petroleum products.

Performance Study at UST Site

Evaluation study performed by customer testing soil samples at a former gas station in Massachusetts.  They wanted to know how Sitelab's GRO test compares to two different laboratory methods, GRO and VPH, commonly used in the United States and elseware.  Sitelab correlated well to both methods.

Still using a PID to Screen Soils?

'Jar Headspace' using photo ionization detectors (PIDs) is common practice for field screening soils contaminated with petroleum hydrocarbons.  PIDs detect air vapors in soil for volatile organic compounds.  Despite their popularity, however, PIDs can often give false readings.  Data shown here compares GRO to PID concentrations testing soils contaminated by weathered gasoline.  Not surprisingly, results did not correlate very well.

Accuracy Testing GRO in Water

Sitelab's UVF-3100 performed well testing blind, NELAC certified, spiked water samples provided by Environmental Resource Associates (Arvada, CO).  Results were compared to the GRO in water concentrations reported by 83 participating laboratories using a variety of gas chromatography methods.

U.S. EPA GRO in Soil Performance

During the U.S. Environmental Protection Agency's TPH in Soil Evaluation Study, a group of soils were spiked in triplicate with weathered gasoline having variable concentrations.  Weathered gasoline contains BTEX and other volatile petroleum hydrocarbons, which make up the GRO fraction found in total petroleum hydrocarbons.  Results were compared to a certified laboratory who performed SW-846 Method 8015B.  EPA evaluated Sitelab's UVF-3100A and six other manufacturers during the program.  

U.S. EPA Soils from Air Force Base

Soils from Kelly Air Force Base in San Antonio, Texas, were analyzed for GRO as part of the EPA’s TPH in Soil Evaluation Study.  Samples were collected from an active underground storage tank (UST) farm, that serves as the government vehicle refueling station at the base.  Soils tested consisted of sandy clays with silty sand and gravel.  EPA reported that for GRO measurement bias 'seven of the eight UVF-3100A results were within 50 percent of the reference method result,' page 66.

Samples collected from other environmental sites located in Indiana and California were included during the study (87 samples in total).  TPH was reported by adding the GRO and DRO concentrations together.

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