Storage of Soil Samples. The concentration of benzene (ug/g) in soil was measured after being stored in sealed glass ampules for different times, as shown in the data below. Quantities given are average ± standard deviation, based on n = 3. Do the results indicate that storage time must be limited to avoid biodegradation? Day 0 (1 Day 5 50103 Day 11 Day 20 57102

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