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When testing GRO 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 GRO
Calibration Kit (CAL-025) on the Slot B optics. |
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Sitelab's GRO samples arrived in a
cooler on ice and were provided in 40 mL VOA vials.
Samples contained deionized water with a spike concentration of
3.47 mg/L of commercial grade, 50% weathered unleaded gasoline.
Sitelab's GRO result was 3.33 mg/L.
<Click
here for more details>
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Computer
printout of GRO test results using Sitelab's software included with the
UVF-3100 analyzer. Results in ppm (mg/L). |
