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     When testing DRO in water, 10 mL of the water sample is measured out and transferred to an extraction jar. 10 mL of methanol solvent is then added to the jar and the extract is shaken for about one minute, giving the solvent ample time to dissolve the contamination. The sample is then poured into a glass cuvette and placed into the UVF-3100 for analysis, which is calibrated using Sitelab's EDRO Calibration Kit (CAL-042) on the Slot A optics.

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     Sitelab's DRO samples arrived in a cooler on ice and were provided in both 40 mL VOA vials and a 1 Liter bottle (pictured above).  Samples contained deionized water with a spike concentration of 3.62 mg/L of commercial grade No. 2 diesel fuel.

Sitelab's DRO result was 3.78 mg/L.

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Computer printout of EDRO test results using Sitelab's software included with the UVF-3100 analyzer. Results in ppm (mg/L).