Dynamics of transformation of the veterinary antibiotic sulfadiazine in two soils.
Dynamics of transformation of the veterinary antibiotic sulfadiazine in two soils.
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DOI：
10.1016/j.chemosphere.2013.09.100
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发表时间：
2014
期刊：
影响因子：
8.8
通讯作者：
S. Sittig;R. Kasteel;J. Groeneweg;D. Hofmann;B. Thiele;Stephan Köppchen;H. Vereecken
中科院分区：
文献类型：
--
作者：
S. Sittig;R. Kasteel;J. Groeneweg;D. Hofmann;B. Thiele;Stephan Köppchen;H. Vereecken
给牲畜施用的兽用抗生素可能会无意中释放到环境中，例如通过向土壤施用粪肥。这些抗生素在土壤中的命运主要取决于吸附和降解过程，包括转化。有必要进一步研究这些新兴污染物在土壤中的组合转化和吸附行为。长期批吸附实验与14 C-放射性标记的抗生素磺胺嘧啶使我们能够同时跟踪磺胺嘧啶的吸附和转化动力学。在液相和连续提取后的固相提取物中分析母体化合物和转化产物。我们发现，多达6个转化产物的降解过程中形成的，这些产品表现出相当不同的动态在两种土壤。转化产物迅速形成，可从固相中提取。我们在两个阶段都观察到了相同的转化产物。输入浓度影响母体物质的转化过程。我们提出了一个详细的分析，包括一个数学描述，并得出预测环境浓度的监管动力学终点。
Veterinary antibiotics administered to livestock can be unintentionally released into the environment, for example by the application of manure to soils. The fate of such antibiotics in soils is mostly determined by sorption and degradation processes, including transformation. There is a need to further examine the combined transformation and sorption behavior of these emerging pollutants in soils. Long-term batch sorption experiments with the14C-radiolabeled antibiotic sulfadiazine enabled us to simultaneously trace the sorption and transformation dynamics of sulfadiazine. The parent compound and the transformation products were analyzed in the liquid phase and in the extracts from the solid phase after a sequential extraction. We found that of up to six transformation products were formed during degradation and that these products exhibited quite different dynamics in the two soils. Transformation products were formed rapidly and were extractable from the solid phase. We observed identical sets of the transformation products in both phases. The input concentration influenced the course of transformation of the parent substance. We present a detailed analysis including a mathematical description and derive regulatory kinetic endpoints for predicting environmental concentrations.