| Abstract |
| Ibuprofen is a nonsteroideal anti-inflammatory drug (NSAID) widely used as a pain reliever and therefore, has been frequently detected in rivers, lakes and even their sediments. However, few data have been available for the fate of ibuprofen in the water/sediment compartment despite its high pKow (=3.5). This study focused on the dynamic sorption of ibuprofen onto sediment at pH 4 and 0 and 30 ppt (part per thousand) of salinity. Experimental data were fitted to several kinetic models such as one-site mass transfer model (OSMTM), pseudo-first order kinetic model (PFOKM), pseudo-second order kinetic model (PSOKM), two compartment first order kinetic model (TCFOKM), and modified two compartment first order kinetic model (MTCFOKM). The MTCFOKM was the best in fitting sorption data (R2 > 0.991 and 0.985 at 0 and 30 ppt salinity, respectively). The MTCFOKM can fit the data into the fast and slow sorption kinetics. The results show that the fast sorption of ibuprofen finished within 1 day, whereas the slow sorption finished between 10 and 100 days. Salinity increases the sorbed amount of ibuprofen (qe) and affects also the finish time for the fast and slow sorption. The increase in salinity decreased the finish time for the fast sorption whereas increased it for the slow sorption. |
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| Key Words |
| Pharmaceutical and personal care products (PPCPs), Ibuprofen, Sorption kinetics, Modified two compartment first order kinetic model (MTCFOKM), Salinity |
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