Effect of composting and soil type on dissipation of veterinary antibiotics in land-applied manures. (April 2018)

• Record Type: Journal Article
• Authors: Chen, Chaoqi; Ray, Partha; Knowlton, Katharine F.; Pruden, Amy; Xia, Kang
• Is Part Of: Chemosphere. Volume 196(2018)
• Page Start: 270
• Page End: 279
• Publication Date: 2018-04
• Subjects: Environmental fate -- Antibiotics -- Dairy -- Beef -- Soil -- Risk assessment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.12.161
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The objective of this study was to determine the fate of commonly used veterinary antibiotics in their naturally excreted form when manure-based amendments are applied to soil. Beef cattle were administered sulfamethazine, tylosin, and chlortetracycline and dairy cows were treated with pirlimycin. The resulting manure was composted for 42 d under static or turned conditions and applied at agronomic N rates to sandy, silt, and silty clay loam soils and compared with amendment with corresponding raw manures in sacrificial microcosms over a 120-day period. Antibiotic dissipation in the raw manure-amended soils followed bi-phasic first order kinetics. The first phase half-lives for sulfamethazine, tylosin, chlortetracycline, and pirlimycin ranged from 6.0 to 18, 2.7 to 3.7, 23 to 25, and 5.5–8.2 d, respectively. During the second phase, dissipation of sulfamethazine was negligible, while the half-lives for tylosin, chlortetracycline, and pirlimycin ranged from 41 to 44, 75 to 144, and 87–142 d, respectively. By contrast, antibiotic dissipation in the compost-amended soils followed single-phase first order kinetics with negligible dissipation of sulfamethazine and half-lives of tylosin and chlortetracycline ranging from 15 to 16 and 49–104 d, respectively. Pirlimycin was below the detection limit in the compost-amended soils. After incubating 120 d, antibiotics in compost-amended soils (up to 3.1 μg kg −1 ) were significantly lower than in manure-amended soils (up to 19 μg kg −1, p < .0001), with no major effect of soil type on the dissipation. Risk assessment suggested that composting can reduce antibiotic resistance selection potential in manure-amended soils. Highlights: Antibiotic dissipation follows bi-phasic first-order kinetics in manure-amended soils. Antibiotic dissipation obeys single-phase first-order kinetics in compost-amended soils. Manure-borne antibiotics persist in soils at low concentrations. Soil type had negligible effect on dissipation kinetics of manure-borne antibiotics. Composting can reduce antibiotic resistance selection potential of manure in soils.