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Water samples were accurately measured on the UVF-3100 analyzer, calibrated
to vacuum pump oil, to match the source of contamination. Results below are
compared to the TPH in water concentrations reported by 31 participating
laboratories.
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Instrumentation and test methods used by participating laboratories: US EPA
Method 418.1 by Infrared (IR) and US EPA Method 1664 by Gravimetric. |