Institute of Environmental Systems Research, University of Osnabrück, Barbarastraße 12, D-49076 Osnabrück, Germany.
Environ Pollut. 2013 Jan;172:180-5. doi: 10.1016/j.envpol.2012.09.010. Epub 2012 Oct 11.
The long-term environmental fate of the veterinary antibiotic sulfadiazine (SDZ) in soils is determined by a reversible sequestration into a residual fraction and an irreversible formation of non-extractable residues (NER), which can be described as first-order rate processes. However, the concentration dynamics of the resulting fractions of SDZ in soil show an unexplained rapid reduction of extractability during the first 24 h. We therefore investigated the short-term extractability of SDZ in two different soils under different SDZ application procedures over 24 h: with and without manure, for air-dried and for moist soils. In all batches, we observed an instantaneous loss of extractability on a time scale of minutes as well as kinetically determined sequestration and NER formation over 24 h. Data evaluation with a simple kinetic model led to the conclusion that application with manure accelerated the short-term formation of NER, whereas sequestration was very similar for all batches.
兽用抗生素磺胺嘧啶（SDZ）在土壤中的长期环境归宿取决于可逆的被残余物部分固定和不可逆的非提取性残留（NER）的形成，这两个过程均可被描述为一级动力学过程。然而，土壤中 SDZ 各相应组分的浓度动态在最初的 24 小时内表现出无法解释的可提取性的快速降低。因此，我们研究了在 24 小时内，通过两种不同的 SDZ 施用程序，即有和没有粪肥、风干和湿润土壤，在两种不同土壤中 SDZ 的短期可提取性。在所有批次中，我们均观察到在数分钟的时间尺度内出现的瞬时可提取性损失，以及在 24 小时内确定的动力学固定和 NER 形成。通过简单的动力学模型对数据进行评估，得出的结论是，施用粪肥会加速短期 NER 的形成，而所有批次的固定作用则非常相似。
