Fig. 4. The average fraction (F_C) 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.