• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Conceptual framework and mathematical model for the transport of metal-chelant complexes during in situ soil remediation
【2h】

Conceptual framework and mathematical model for the transport of metal-chelant complexes during in situ soil remediation

机译：金属-螯合配合物在原位土壤修复过程中运输的概念框架和数学模型

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Understanding the transport of metal-chelant complexes is a challenging but necessary task for assessing the in situ chelant applications for land remediation and the potential environmental risks. This study presented an integrated conceptual framework for delineating primary and secondary interactions between target metals, chelants and soil components. The mathematical transport model based on primary interactions reasonably simulated the breakthrough curves of multiple target metals (Cu, Zn, Pb, Cr, and Ni) and mineral cations (Fe, Al, Mg, Mn, and Ca) during EDTA flushing of a field-contaminated soil. The first-order extraction rates of target metals were on the order of 10-6s-1, except Zn (10-4s-1) due to exceptionally large extractable amount in the soil. These rates compared well with previously reported values for field-contaminated soil, but were much smaller than those for artificially contaminated soil. The first-order dissolution rates of mineral cations (10-6-10-5s-1) were similar to the reported values for crystalline minerals, except Ca (10-4s-1) because of substantial proton-induced dissolution of carbonates. Nevertheless, due to a wide spectrum of extraction and dissolution rates at different stages, the model provided a more conservative prediction (i.e., overestimation) of metal-chelant transport while underestimated the transport of free chelant. Further revision of the proposed model may improve its prediction accuracy but attention should be paid to the model complexity and the number of adjustable parameters.
机译：了解金属螯合剂配合物的运输是一项艰巨但必不可少的任务，对于评估就地修复剂在土地修复中的应用和潜在的环境风险而言。这项研究提出了一个综合的概念框架，用于描述目标金属，螯合剂和土壤成分之间的主要和次要相互作用。基于一次相互作用的数学输运模型合理地模拟了多种目标金属（铜，锌，铅，铬和镍）和矿物阳离子（铁，铝，镁，锰和钙）在田间EDTA冲洗过程中的穿透曲线。污染的土壤。目标金属的一级提取速率约为10-6s-1，但锌（10-4s-1）除外，原因是土壤中的可提取量特别大。这些比率与以前报道的田间污染土壤的数值比较好，但比人工污染土壤的数值小得多。矿物阳离子的一级溶解速率（10-6-10-5s-1）与晶体矿物的报道值相似，但Ca（10-4s-1）除外，这是由于大量的质子诱导的碳酸盐溶解。然而，由于在不同阶段的提取和溶解速率范围广，该模型提供了对金属螯合剂迁移的更保守的预测（即，高估），而低估了游离螯合剂的迁移。建议模型的进一步修订可以提高其预测准确性，但应注意模型的复杂性和可调参数的数量。

著录项

  • 作者

    Zhang W; Tsang DCW;

  • 作者单位
  • 年度 2013
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

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