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| Titel |
Colloid-Mediated Transport of PPCPs through Porous Media |
| VerfasserIn |
Xijuan Chen, Yingna Xing, Xin Chen, Jie Zhuang |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141303
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| Publikation (Nr.) |
 EGU/EGU2017-4801.pdf |
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| Zusammenfassung |
| Pharmaceutical and personal care products (PPCPs) enter the soil through reclaimed water
irrigation and biosolid land application. Colloids, such as clays that are present in soil, may
interact with PPCPs to affect their fate and transport in the subsurface environment. This
study addresses how soil colloids mediate the sorption and transport behaviors of PPCPs
through laboratory column experiments. The affinities of PPCPs for colloids as well as the
influence factors were investigated.
For PPCPs that have high sorption (e.g., ciprofloxacin with Kd ∼104−5 L/kg) on soil
colloids, the transport is dominantly controlled by colloids, with a higher extent of
colloid-facilitated effect at lower ionic strength. For PPCPs that have intermediate
sorption (e.g., tetracycline with Kd ∼103−4 L/kg) on soil colloids, the mobility of
dissolved and colloid-bound PPCPs respond oppositely to the effect of changes in
solution ionic strength, making the net effect of soil colloids on PPCP transport
variable with soil solution chemistry. For PPCPs with low sorption (e.g., ibuprofen
with Kd ∼102−3 L/kg) on soil colloids, other measures (such as pre-filtration)
must be taken. This study suggested that colloids are significant carriers of PPCPs
in the subsurface environment and could affect their off-site environmental risks. |
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