Performance Testing GRO in Water:

Gasoline range organics are tested to measure the concentrations of volatile petroleum hydrocarbons in the C6 to C10 carbon range.  Sitelab's UVF technology is selective to BTEX and other mono-aromatic compounds. 

Results are compared to laboratories performing EPA Method 8015, 8260 and other gas chromatography methods.  83 laboratories participated in this proficiency study.  The sample was spiked with weathered gasoline.

Sitelab used methanol to extract sample.  This solvent is suitable for light-refined petroleum contaminants.  Sample was analyzed by UVF calibrated to Sitelab's GRO Calibration Kit CAL-025.

Performance Testing DRO in Water:

Diesel range organics are tested to measure the concentrations of petroleum hydrocarbons in the C10 to C28 up to C36 carbon range.  Sitelab's UVF technology is highly sensitive to TPH diesel and oil range compounds. 

Results are compared to laboratories performing EPA Method 8015 and similar state regulatory GC-FID methods.  83 laboratories participated in this proficiency study.  The sample was spiked with diesel fuel.

Sitelab used methanol to extract sample.  This solvent is suitable for light-refined petroleum contaminants.  Sample was analyzed by UVF calibrated to Sitelab's EDRO Calibration Kit CAL-042.

Performance Testing TPH in Water:

Total Petroleum Hydrocarbons is a test common to the oil industry to measure the concentrations of crude oils, lubricating oils and waste oils in water.  Sitelab used hexane to extract sample.  This solvent is suitable for both light and heavy oils.  Hexane is same solvent used by the laboratory methods.

The sample was spiked with vacuum pump oil.  This oil was provided by ERA to calibrate the analyzer for accurate TPH measurement.  Sitelab results correlated well to EPA Methods 1664 by Gravimetric and 418.1 by Infrared.  31 laboratories participated in this proficiency study.     

Sitelab's TPH OIL Calibration Kit CAL-057 produced lower readings.  It contains more aromatics than vacuum pump oil.  Lubricating oils contain high proportions of aliphatics, which do not fluorece.  For most oil in water applications, the source oil is available and can be used to make a calibration standard.