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Molecular Weight of Dissolved Organic Matter–Napropamide Complex Transported through Soil Columns

^a Dep. of Plants, Soils, and Biometeorology, Utah State Univ., Logan, UT 84322-4820
^b Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424

View larger version (12K): [in a new window]   Fig. 1. Concentration (reported as total carbon) of dissolved organic matter (DOM) plotted as a function of cumulative leachate eluted from the bottom of the columns containing soil with sewage sludge applied (SS) and soil without sewage sludge applied (NoSS). Values reported are the average of the three replications. Error bars are ±1 standard error of the mean.

View larger version (12K): [in a new window]   Fig. 2. Napropamide concentration versus cumulative leachate eluted from the bottom of columns containing soil with sewage sludge applied (SS) and soil without sewage sludge applied (NoSS). Values reported are the average of the three replicates. Error bars are ±1 standard error of the mean.

View larger version (11K): [in a new window]   Fig. 3. Ratio of napropamide mass measured (M) in a particular soil layer divided by the total mass (Mt) of napropamide applied to the surface layer of the column after passing 440 mL of water (approximately 1.3 pore volumes if started at saturation) through columns containing soil with sewage sludge applied (SS) and soil without sewage sludge applied (NoSS). Data points of the curve are located at the bottom of each soil sample section and are the average of the three replications. Error bars are ±1 standard error of the mean.

View larger version (14K): [in a new window]   Fig. 4. The average fraction (FC) of complexed napropamide within the specified range of molecular weights is plotted for each effluent sample from the soil without sewage sludge applied (NoSS). The fraction of complexed napropamide is 1 for each effluent sample but the total amount of complexed napropamide is different for each sample. Therefore, the fraction of napropamide complexed with a molecular weight between 500 and 1000 Daltons is similar for the 55- and 275-mL samples but the total amount of complex is much lower for the 275-mL sample than the 55-mL sample.

View larger version (15K): [in a new window]   Fig. 5. The average fraction (FC) of complexed napropamide within the specified range of molecular weights is plotted for each effluent sample from the soil with sewage sludge applied (SS). The fraction of complexed napropamide is 1 for each effluent sample but the total amount of complexed napropamide is different for each sample. Therefore, the fraction of napropamide complexed with a molecular weight between 500 and 1000 Daltons is similar for the 165- and 225-mL samples but the total amount of complex is lower for the 225-mL sample than the 165-mL sample.