Role of organic matter, clay, and iron contents in the sorption of oxytetracycline on river sediments

Abstract

Background: Oxytetracycline (OTC) is a widely-used antibiotic; metabolism studies indicate only partial assimilation of it inside the body. Traditional wastewater treatment plants cannot remove OTC, and this results in the release of considerable amounts of the drug into aquatic environments. There is much concern over the role of residual antibiotics in the development of new generations of bacteria with modified resistance to the antibiotics. The present work investigated the possibility of OTC sorption on river sediments. Methods: Seven sediment samples were collected from various locations and depths of the Passaic River in New Jersey. The texture, clay, extractable iron, and organic matter contents of the sediments were determined. Pyrolysis-gas chromatography-mass spectrometric (Py GC-MS) analysis indicated the presence of 3 categories of organic materials: petroleum hydrocarbons, anthropogenic, and plant residual materials. The sediment samples were equilibrated with OTC solutions for 24 hours followed by centrifugation and syringe filtration. The residual OTC contents were determined by high performance liquid chromatography. Results: It appeared that 35%-60% fractions of OTC were retained by the sediments. The sorption capacity values of the sediments were correlated with clay content, organic matter content, and available iron. A poor correlation was found between adsorption capacity and clay content in the presence of organic matter and iron. Meanwhile, a relatively strong correlation was found between adsorption capacity with the iron, R 2 = 0.7499, and organic matter contents of the sediments, R 2 = 0.7899. Thus, the sorption of OTC on sediments is governed by all constituents. Conclusion: It was concluded that the antibiotic-sediment interaction is controlled mainly by the organic matter and iron contents. Keywords: Oxytetracycline, sorption, Passaic River sediment, Organic matter, Pyrolysis gas chromatographymass spectrometry, Py GC-MS Citation: Barbooti MM. Role of organic matter, clay, and iron contents in the sorption of oxytetracycline on river sediments.

Phosphate affects adsorption and desorption of oxytetracycline in the seawater-sediment systems

“…Marine sediments or montmorillonite with a higher clay content were reported having a higher adsorption capacity for tetracyclines (Xu and Li 2010). Barbooti (2017) demonstrated that adsorption of OTC on sediment is controlled mainly by the iron contents. Figure 3 illustrates the effect of phosphate concentration on OTC adsorption on sediments.…”

Transport of oxytetracycline through saturated porous media: role of surface chemical heterogeneity

“…9 Several reports have investigated the adsorption of OTC to various clays as well as iron oxides, providing insights into possible mechanisms that inuence the interactions between OTC and minerals. [10][11][12][13] Moreover, Wang et al reported that the presence of natural organic matter could promote the adsorption of OTC onto sediments by activating the adsorbents' sorption sites and decreasing the activation energy induced by organic matter. 4 That is, these components are likely to play critical roles in the mobility of various antibiotics.…”

Detection to trace aluminum ion of pharmaceutical wastewater using synthesis of Schiff-based chemosensor

“…The texture, clay, extractible iron and organic content of the sediments were measured. Pyrolysis-gas chromatography activity, mass spectrometry analysis showed that there are 3 types of organic substances: Crude hydrocarbons, artificial, and plant residues (33). Malakootian et al conducted a study to remove acid red 18 dye contained in wastewater, which are untreated in the aqueous environment, using hybrid micro-electrolysis process, including iron and Charcoal under the influence of ultrasonic waves (Fe/C/US) (34).…”