Impacts of Soil Organic Matter and Temperature on Sorption of Acetazolamide on Four Soils

• Published in: Soil & sediment contamination Vol. 21; no. 4; pp. 498 - 509
• Main Authors: Chen, Jian-Qiu, Ding, Yu-Hui, Hu, Yu-Zhu
• Format: Journal Article
• Language: English
• Published: Boca Raton Taylor & Francis Group 01.05.2012; Taylor & Francis Ltd
• Subjects: acetazolamide; Acetazolamide sorption; clay; electrostatic interactions; groundwater contamination; heat production; metal ions; risk; Soil contamination; soil organic matter; soil pH; Soils; Sorption; sorption isotherms; temperature; Thermodynamics; thermodynamics parameters
• ISSN: 1549-7887; 1532-0383; 1549-7887
• DOI: 10.1080/15320383.2012.664188

Batch sorptions of acetazolamide (AZ) were conducted using four soils from China. Sorption of AZ was found to be impacted by OC, clay content, and soil pH, with higher kd values for soils with higher clay content. The kd values of SOM-removed soils are much lower than those of bulk soils. Sorption data were well fitted with a Freundlich model (r² > 0.99). Chelating with the metal ions on the surfaces of soil particles was probably involved. With pH increase, the electrostatic attraction between anionic AZ and positively charged soil surface may increase. The sorption capacity decreased when the temperature increased from 20 to 40°C, and the calculated thermodynamics parameters of ΔG₀, ΔH₀, and ΔS₀ indicated that the sorption was a non-spontaneous, physisorption, and exothermic process. Sorption coefficients (kd) for the compound in soil were low (ranging from 0.42 to 1.19 L·kg⁻¹) and indicated that low level sorption of AZ with appreciable risk of ground water contamination.