Influence of metal cation and surface iron oxide on the transport of sulfadiazine in saturated porous media

The Science of the Total Environment
Hui ZhangQing Lin

Abstract

Sulfadiazine (SDZ) is an antibiotic frequently detected in soil and groundwater. The transport of SDZ in subsurface environment is a critical process affecting its retention in soil. To date, the effects of iron oxide and metal cation on the transport of SDZ remain largely unknown, so we investigated the transport properties of SDZ in cleaned and iron oxides coated quartz sand, as affected by the presence of conventional cations (Ca2+, Mg2+, K+, and Na+) and Cd2+ through column experiments and simulation. We found that iron oxide coating on sand surface inhibited the transport of SDZ, mainly due to hydrophobic effect, complexation, and electrostatic attraction. The inhibitory effect became more marked with increasing concentration of Cd2+. It favors the transport of Cd2+ due to the electrostatic repulsion between positively charged iron oxide and Cd2+. Ca2+ promoted the transport of SDZ in coated sand, while all the conventional cations had no effect on the transport of SDZ in cleaned sand. The increase in the concentration of Cd2+ favors the transport of SDZ in cleaned sand. However, in iron oxide coated sand, the influence of Cd2+ on the transport of SDZ was dependent on the concentration of Cd2+. At lower concentration of Cd...Continue Reading

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