Leaching behavior of veterinary antibiotics in animal manure-applied soils
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AbstractAgricultural fields worldwide are being contaminated by the escalating application of veterinary antibiotics (VAs)
via animal manure and biosolids applied as fertilizers or of wastewater for irrigation, resulting in soil degradation
and damage to the health of terrestrial environments. This paper describes a series of column studies investigating
the leaching behavior of five VAs, tetracycline (TC), sulfamethazine (SMZ), norfloxacin (NOR), erythromycin
(ERY) and chloramphenicol (CAP), under different simulated rainfall conditions that could occur in agricultural
environments. Our aim was to explore the effects of acid rain and torrential rain on the leaching of different
VAs and to determine their leaching behaviors along the soil profile. The results showed that acid rain accelerated
the accumulation of VAs from animal manure in surface soil while long rainfall durations promoted the downward
migration of VAs in soil. Under acid rain conditions, a higher concentration of VAs remained in the animal
manure. More VAs were eluted to deeper soil layers and the leachate under extreme rainfall conditions. The
leachability of VAs was higher in sandy soil than in clay or loamy soil. SMZ and ERY posed a higher risk to deeper
soil layers and groundwater, while NOR and TC tended to persist in surface soil, which can be explained by their
different physicochemical properties in soil. Moreover, the general trends from two model assessments and soil
column measurements appeared to be in agreement. SMZ had a high leachability,while NOR tended to accumulate
in soils. This study provided vital insight into the persistence mechanisms of VAs in terrestrial environments
and their potential risks to soils and groundwater.
All Author(s) ListPan M., Chu L.M.
Journal nameScience of the Total Environment
Year2017
Month2
Day1
Volume Number579
PublisherElsevier
Pages466 - 473
ISSN0048-9697
eISSN1879-1026
LanguagesEnglish-United States
KeywordsVeterinary antibiotics, Acid rain, Leaching ability, Persistence, Soil physicochemical properties

Last updated on 2020-27-11 at 02:13