Effect of sampling duration on the concentration of particulate organics collected on glass fiber filters

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Abstract
A study was conducted to investigate the effect of sampling duration upon the concentration of particulate organic matter (POM) collected on glass fiber filters. Samples of total suspended particulate matter were simultaneously collected over three sampling periods: seven days (1 weekly sample), twenty-four hours (13 daily samples), and six hours (4/day for 13 days). Each collected filter sample was extracted sequentially with solvents of increasing polarity, cyclohexane, dichloromethane, and acetone, respectively. Higher concentrations of cyclohexane-soluble organic matter were observed with longer sampling periods for these simultaneously collected samples. In contrast, concentrations of dichloromethane-soluble fraction were lower as the duration of sampling increased. The concentrations of the acetone-soluble fractions showed no significant dependence on sampling duration, within the experimental uncertainties.