Long-term broiler litter amendments can alter the soil’s capacity to sorb monensin

Abstract

Monensin is a common antiparasitic drug given to poultry that contaminates poultry manure and bedding material (broiler litter). As broiler litter is commonly applied to agricultural fields as fertilizer, monensin could be released beyond the farm if it is not retained or degraded in the soil. This study aimed to assess the impact of long-term surface application of broiler litter (i.e., 17 years) on the capacity of pasture soil to sorb monensin. The soils were exposed to a range of monensin concentrations (0.18 to 1.81 μmol L), solution pH (pH 4-9), and temperatures (15, 25, and 35 °C) and monensin was measured as loss from solution (i.e., sorption). Soils receiving long-term litter applications were hypothesized to retain more monensin than unamended soils because they have higher organic matter concentrations. However, soils from broiler litter-amended fields sorbed 46% less monensin than soils from unamended fields, likely because broiler litter also increased soil pH. The sorption of monensin to soil was strongly influenced by pH, with an order of magnitude greater sorption at pH 4 than at pH 9. Both soils had similar capacity to sorb monensin under similar solution pH, despite differences in organic carbon content (with the broiler litter-amended having 25% greater relative to the unamended soil). Temperature did not significantly impact monensin sorption for either soil. Our findings suggest increasing soil pH, for instance through liming, could enhance mobility of monensin.

Safety and efficacy of Monimax® (monensin sodium and nicarbazin) for turkeys for fattening

“…In another study, eight soils (Table ) and a batch equilibrium methodology were used to determine the adsorption Freundlich isotherms for monensin (two of the soils had the pH adjusted) . In a recent study (Doydora et al., ), the sorption behaviour of monensin has been investigated. The Kendall test was used to explore pH dependence of adsorption in soil.…”

“…Considering that the sorption of monensin to soil is dependent on more factors than only the pH and the amount of organic carbon and it is regularly detected in surface water and groundwater (Doydora et al., ), the lowest adsorption coefficient normalised to the organic carbon content (K oc ) value from the sorption studies (74.1 L/kg organic carbon for the clay loam) was selected as a reasonable worst‐case estimate for further calculations.…”

Estudio de la distribución ambiental de fármacos de origen pecuario y evaluación de alternativas de mitigación en aguas contaminadas

“…Los valores de concentración de MON en los SS se correlacionaron de manera inversa con el pH de las muestras de agua. Según algunos autores, se espera una disminución de Kd cuando el pH aumenta, en el rango de 4 a 8.5 que es contrario a lo esperado para moléculas con grupos carboxilatos terminales como los antibióticos ionóforos (Hussain y Prasher, 2011;Sassman y Lee, 2007) (Doydora et al, 2017). Por otra parte, las concentraciones de SAL en agua correlacionaron con la conductividad eléctrica del agua, por lo que el entorno iónico efectivamente afecta la solubilidad de la molécula (y por ende el transporte).…”