Effects of pig slurry on the sorption of sulfonamide antibiotics in soil

Sorption of p-aminobenzoic acid (pABA) and five sulfonamide antibiotics to loess Chernozem topsoil amended with varied additions of pig slurry was investigated in batch trials. In unfertilized soil, partition coefficients (Kd) of sulfonamides ranged from 0.3 to 2.0. Strong sorption nonlinearity (1/n...

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Published in:	Archives of environmental contamination and toxicology Vol. 47; no. 1; pp. 31 - 39
Main Authors:	Thiele-Bruhn, S, Aust, M.O
Format:	Journal Article
Language:	English
Published:	Heidelberg Springer-Verlag 01-07-2004 Berlin Springer Nature B.V New York, NY
Subjects:	Adsorption Agriculture Animal wastes Animal, plant and microbial ecology Animals Anti-Infective Agents - chemistry Antibiotics Applied ecology Biological and medical sciences Dissolved organic matter Ecotoxicology, biological effects of pollution Fundamental and applied biological sciences. Psychology General aspects loess Chernozems Manure Manures Models, Theoretical Pig manure Slurries soil amendments Soil Pollutants - analysis soil types Soils Sorption sulfonamides Sulfonamides - chemistry Swine Temperature Topsoil veterinary drugs Waste Disposal, Fluid - methods xenobiotics Sorption Soils Antibiotic Pollution Ecotoxicology Toxicity Animal slurry Environment
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Summary:	Sorption of p-aminobenzoic acid (pABA) and five sulfonamide antibiotics to loess Chernozem topsoil amended with varied additions of pig slurry was investigated in batch trials. In unfertilized soil, partition coefficients (Kd) of sulfonamides ranged from 0.3 to 2.0. Strong sorption nonlinearity (1/n = 0.5 to 0.8) was best fitted by the Freundlich isotherm (R2 = 0.7 to 1.0) and was indicative for specific sorption mechanisms. Adsorption to pig slurry was much stronger, and nondesorbable portions were increased compared with soil. However, in a mixture of soil and slurry (50:1 w/w), sorption of the antibiotics was significantly decreased at a lower concentration range of pABA and the sulfonamides. This was attributed to competitive adsorption of dissolved organic matter (DOM) constituents from manure. An increase in pig slurry amendment resulted in increased total organic matter, DOM concentration, and ionic strength, but pH decreased. As a result, the nonadsorbed portions of pABA, sulfanilamide, and sulfadiazine (logD(ow) < -0.4) ranged from 47% to 82% of the applied concentration in the differently manured substrates. Dissolved fractions of the antibiotics reached a maximum at a soil-slurry ratio of 9:1 and decreased with further addition of manure. This decrease was related to the formation of less-effective DOM associates in solution. The adsorbed and desorbed portions of the less-polar substances--sulfadimidine, sulfadimethoxine, and sulfapyridine (logD(ow) > 0.1)--remained nearly constant in the presence of increased manure input. The pH changes caused by manure amendment strongly affected ionisation status of the latter compounds, thus resulting in increased adsorption, which compensated the mobilizing effect of DOM. It is suggested that the effect of manure be considered in test methods to determine the soil retention of pharmaceutical substances.
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ISSN:	0090-4341 1432-0703
DOI:	10.1007/s00244-003-3120-8