GRO in Water 

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Water samples were accurately measured on the UVF-3100 analyzer, calibrated to Sitelab's GRO calibration kit. 

The certified spiked concentration was 3.47 mg/L.  Sitelab's GRO result was 3.33 mg/L.

Results below are compared to the GRO in water concentrations reported by 83 participating laboratories using GC-FID, GC-PID, GC-MS instrumentation.

Examples of laboratory GRO methods used in this study: U.S. EPA 8015, 8015B, 8015M, 8020, 8260B, California LUFT, Maine 4.2.17, NWTPH-Gx and IDNR OA-1.

Accuracy is shown below.

 

 

GRO in Water Test Procedure:






When testing gasoline range organics (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.

Sitelab's GRO samples arrived in a cooler on ice and were provided in 40 mL VOA vials.  Samples contained deionized water spike with commercial grade 50% weathered unleaded gasoline.

 The certified spiked concentration was 3.47 mg/L.  Sitelab's GRO was 3.33 mg/L.



Computer printout of GRO test results using Sitelab's software included with the UVF-3100 analyzer.


Disclaimer: This chart is published with permission from Environmental Resource Associates, Inc. a subsidiary of Waters Corporation. ERA does not endorse Sitelab or it's products. To learn more about ERA, visit their website at www.eraqc.com

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