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Sorption of the Veterinary Antimicrobial Sulfathiazole to Organic Materials of Different Origin

机译:兽用磺胺噻唑对不同来源有机材料的吸附

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摘要

Sulfonamides(SA), ionizable, polar antimicrobial compounds, may reach the environment in substantial amounts by the spreading of manure. The environmental behavior of SA is still difficult to predict. We investigated the influence of the main factors supposed to control SA sorption to organic materials: composition of sorbent, solute chemistry, and contact time. For that purpose, sulfathiazole (STA) sorption to compost, manure, and humic acid after 1 and 14 d was studied under sterile conditions. The experiments demonstrated that sorption was most strongly affected by contact time and pH. Irrespective of sorbent and pH, sorption continued substantially after the fast initial sorption within 1 d. For all sorbents and both contact times, STA sorption exhibited a pronounced pH dependence. Species-specific K_(oc) values decreased in the order k_(oc)~(cation) K_(oc)~(neutral) > K_(oc)~(anion). Differences in sorbent composition influenced STA sorption weaker. For the neutral STA species, NMR chemical shift regions assignable to ketonic, carboxylic, and phenolic C as well as aromatic C-H and methoxyl/N-alkyl C seemed to control sorption. Forthe cations, sorption followed the cation exchange capacities of the sorbents. STA sorption to manure and humic acid increased with higher ionic strength (0.31 M compared to 0.06 M) at pH 7.5.
机译:磺酰胺(SA)是可电离的极性抗菌化合物,可能通过粪肥的扩散而大量进入环境。 SA的环境行为仍然难以预测。我们调查了可能控制SA对有机材料吸附的主要因素的影响:吸附剂的组成,溶质化学性质和接触时间。为此目的,在无菌条件下研究了1和14天后磺胺噻唑(STA)对堆肥,肥料和腐殖酸的吸附。实验表明,吸附时间受接触​​时间和pH值影响最大。不论吸附剂和pH值如何,在1 d内快速初始吸附后,吸附基本持续。对于所有吸附剂和两种接触时间,STA吸附均表现出明显的pH依赖性。特定物种的K_(oc)值按k_(oc)〜(阳离子) K_(oc)〜(中性)> K_(oc)〜(阴离子)的顺序降低。吸附剂组成的差异会影响STA的吸附能力。对于中性STA物种,可分配给酮,羧基和酚C以及芳族C-H和甲氧基/ N-烷基C的NMR化学位移区似乎可以控制吸附。对于阳离子,吸附遵循吸附剂的阳离子交换能力。在pH 7.5下,STA对粪便和腐殖酸的吸附随着较高的离子强度(0.31 M对0.06 M)而增加。

著录项

  • 来源
    《Environmental Science & Technology》 |2007年第1期|p.132-138|共7页
  • 作者

    MAREN KAHLE; CHRISTIAN STAMM;

  • 作者单位

    Agroscope Changins-Waedenswil Research Station ACW, Schloss, Postfach 185, 8820 Waedenswil, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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