...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Degradation of trinitrotoluene in contaminated soils as affected by its initial concentrations and its binding to soil organic matter fractions
【24h】

Degradation of trinitrotoluene in contaminated soils as affected by its initial concentrations and its binding to soil organic matter fractions

机译：三硝基甲苯在受污染的土壤中的降解受其初始浓度及其与土壤有机质组分的结合的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Trinitrotoluene (TNT), a nitroaromatics, is a major pollutant in explosive contaminated soils. Present study reports the effect of initial concentration of TNT on its degradation kinetics in soils. Soils from two contaminated sites viz. Clausthal and Elsnig, Germany, were mixed with an uncontaminated reference soil to get different initial concentrations (mg/kg) viz Clausthal-1 (54.29), Clausthal-2 (30.86), Clausthal-3 (7.05) Elsnig-1 (879.67), Elsnig-2 (86.43); Elsnig-3 (8.16) and Elsnig-4 (0.99) and were spiked with ring UL-~(14)C-TNT (100KBq/50g soil). Except Elsnig-1 and Elsnig-2 soils, TNT degraded at same rate in all the soils. Higher persistence of TNT in Elsnig-1 and Elsnig-2 soils appears to be due to higher initial concentrations of nitroaromatics which may be toxic to soil microorganisms. 2-Amino-4,6-dinitrotoluene (2-ADNT) and 4-amino-2,6-dinitrotoluene (4-ADNT) were recovered as major metabolites of TNT. Distribution of bound ~(14)C-activity in different soil organic matter (SOM) fractions (humic acid, fulvic acid and humin) was assayed by alkali extraction of solvent extracted Clausthal-1 and Elsnig-1 soils. Results indicate that humic acid accounted for maximum bound activity followed by fulvic acid and humin fractions. Expressing ~(14)C-activity bound/unit weight of organic carbon content of SOM fractions showed that 3 times more ~(14)C-activity was bound to Elsnig humic acid than Clausthal humic acid. Similarly, activity associated with Elsnig fulvic acid was 7 times higher than that of Clausthal fulvic acid suggesting that chemical nature of SOM fractions plays a significant role in binding of contaminants.
机译：三硝基甲苯（TNT）是一种硝基芳香族化合物，是爆炸性污染土壤中的主要污染物。目前的研究报道了TNT初始浓度对其在土壤中降解动力学的影响。来自两个受污染地点的土壤。将Clausthal和Elsnig（德国）与未污染的参考土壤混合，以得到不同的初始浓度（mg / kg），即Clausthal-1（54.29），Clausthal-2（30.86），Clausthal-3（7.05）Elsnig-1（879.67） ，Elsnig-2（86.43）;将Elsnig-3（8.16）和Elsnig-4（0.99）分别加环UL-〜（14）C-TNT（100KBq / 50g土壤）加标。除Elsnig-1和Elsnig-2土壤外，TNT在所有土壤中的降解速率均相同。 TNT在Elsnig-1和Elsnig-2土壤中的较高持久性似乎是由于较高的硝基芳香烃初始浓度可能对土壤微生物有毒。回收2-氨基-4,6-二硝基甲苯（2-ADNT）和4-氨基-2,6-二硝基甲苯（4-ADNT）作为TNT的主要代谢产物。通过碱萃取溶剂提取的克劳斯塔尔-1和埃尔斯尼希-1土壤，测定了不同土壤有机质（腐殖酸，黄腐酸和腐殖质）中结合的〜（14）C活性的分布。结果表明，腐殖酸占最大的结合活性，其次是富里酸和腐殖质组分。表示〜（14）C-活性键合/ SOM馏分的有机碳含量的单位重量表明，Elsnig腐植酸与〜（14）C-活性键合的克劳斯塔尔腐殖酸多3倍。同样，与Elsnig富维酸有关的活性比克劳斯塔尔富维酸高7倍，这表明SOM馏分的化学性质在污染物结合中起着重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号