Sorption of Oxytetracycline to Iron Oxides and Iron Oxide-Rich Soils

Abstract

The sorption interactions of oxytetracycline with goethite, hematite, and two iron oxide-rich soils were investigated using batch sorption experiments. Oxytetracycline sorption coefficients for goethite and hematite increased with pH to maximum values at pH approximately 8. The sorption edge shape and desorption treatments were consistent with a surface complexation mechanism and could be described by the interaction of divalent anion species with the oxide surface. Oxytetracycline sorption to Georgeville and Orangeburg Ultisol soils decreased with pH. Chemical digestion treatments were used to deduce that soil sorption occurred by complexation to oxide coatings on clay and quartz grains. These results indicate that sorption models must consider the interaction of oxytetracycline, and other similar ionogenic compounds, with soil oxide components in addition to clays and organic matter when predicting sorption in whole soils.

Spatial and seasonal distribution of selected antibiotics in surface waters of the Pearl Rivers, China

“…No antibiotics from tetracyclines were detected in the rivers and WWTP effluents, probably due to their strong binding capacity to particulate matters and interaction with cations. [32,33] Thus only these detected antibiotics were discussed in the following section. No antibiotics were detected in the samples from site S0 (Liuxi Reservoir), which was used as the control and also used in the spiking tests.…”

Process enhancement at near neutral pH of a homogeneous photo-Fenton reaction using ferricarboxylate complexes: Application to oxytetracycline degradation

“…S1b), for pH values between 3.0 and 5.0, the molar fraction of zwitterionic OTC (H2OTC) increases from 0.5 to nearly 1.0. Figueroa and Mackay [36] reported that the expected initial decrease in the concentrations of OTC and DOC with increasing pH after the iron salt addition step is a consequence of the interaction between ferrous hydrous oxides and deprotonated OTC species. Taking into consideration Eq.…”

Ocorrência, comportamento e impactos ambientais provocados pela presença de antimicrobianos veterinários em solos

“…Como resultado, verificou-se que as espécies aniônicas do fármaco apresentaram tendência superior, em relação às formas zwitteriônicas, à complexação com a superfície neutra do óxido. 66 Em contrapartida, no modelo de sorção desenvolvido por Sassman e Lee, 56 os K d calculados para a TC, OTC e CTC foram maiores para as espécies catiônicas, considerando a sorção dos fármacos nos sítios negativos do solo.…”

“…64,69 Entretanto, em outras situações, o modelo de Langmuir (Equação 3) mostrou-se mais adequado. 61,66,76 Para o melhor entendimento destes modelos pode ser consultado o trabalho publicado por Travis e Etnier. Os estudos de dessorção são realizados com o objetivo de investigar se a retenção do contaminante no solo ocorre de forma reversível ou não.…”