Livestock waste is an important source of antibiotic pollution, and sulfonamides may be present along with organic-rich substances. This study investigated the sorption reaction of two sulfonamides, sulfamethoxazole and sulfapyridine in two organic-rich sorbents: a commercial peat soil (38.41 % carbon content) and a composted manure (24.33 % carbon content). The results suggested the sorption mechanism of these two sulfonamide antibiotics tended to be hydrophobic partitioning under most of the experimental conditions, especially at pH values lower than their corresponding pK<sub>a2</sub>. The fluorescence excitation emission matrix and dissolved organic carbon leaching test suggested composted manure has higher fulvic acid organics and that peat soil has higher humus-like organics. Small organic molecules showed stronger affinity toward sulfonamide antibiotics and cause the composted manure to exhibit higher sorption capacity. Overall, this study suggests that the chemical structure and properties of sulfonamides antibiotics and the type of organic matter in soils will greatly influence the fate and transport of these contaminants into the environment.

Adsorption of sulfamethoxazole and sulfapyridine antibiotics in high organic content soils

256th National Meeting (2018)

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