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首页> 外文期刊>Environmental toxicology and chemistry >Investigations on the fate of sulfadiazine in manured soil: laboratory experiments and test plot studies.
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Investigations on the fate of sulfadiazine in manured soil: laboratory experiments and test plot studies.

机译：粪土中磺胺嘧啶的去向调查：实验室实验和试验田研究。

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The fate of 14C-labeled sulfadiazine (SDZ) in manured soil has been investigated in laboratory test systems. In the first approach, stability of 14C-SDZ in liquid bovine manure has been tested. Only 1% of the initially applied radiotracer was mineralized to 14C-carbon dioxide and 82% were transferred to nonextractable residues within a 102-d incubation period. Test slurries with defined aged residues were prepared and, supplementary to standard solutions, applied to silty-clay soil samples. These tests showed the high affinity of 14C-SDZ residues to the soil matrix. In the second approach, basic data on microbial, chemical, and photoinduced degradability in soil were gathered. The data indicated the formation of nonextractable residues as the predominant process in soil, which was accelerated by the test slurry application. In the third approach, laboratory lysimeter tests were conducted to investigate leaching and degradation as simultaneously occurring processes. The 14C-SDZ residues (64%) mainly were retained in the surface layer as nonextractable residues. Although a high mobility in soil was revealed by a soil/water distribution coefficient of 2 L kg(-1), percolate contamination amounted to only 3% of the initially applied 14C-SDZ. The tendencies of leaching and degradability in soil also were observed in test plot studies under field conditions.
机译：在实验室测试系统中已经研究了14 C标记的磺胺嘧啶（SDZ）在肥料中的命运。在第一种方法中，已经测试了14C-SDZ在液态牛粪中的稳定性。在102天的孵育时间内，只有1％的最初应用的放射性示踪剂矿化为14C二氧化碳，而82％的化合物被转移至不可提取的残留物中。制备具有确定的老化残留物的测试浆液，并将其作为标准溶液的补充，应用于粉质粘土土壤样品。这些测试表明14C-SDZ残基对土壤基质具有高度亲和力。在第二种方法中，收集了土壤中微生物，化学和光诱导降解性的基本数据。数据表明，不可提取的残留物的形成是土壤中的主要过程，而测试泥浆的施加加速了残留物的形成。在第三种方法中，进行了实验室溶渗仪测试，以研究同时发生的浸出和降解过程。 14C-SDZ残留物（64％）主要作为不可提取的残留物保留在表面层中。尽管通过2 L kg（-1）的土壤/水分配系数显示出土壤中的高迁移率，但渗滤液污染仅为最初使用的14C-SDZ的3％。在田间条件下的试验区研究中也观察到了土壤中淋溶和降解的趋势。

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