...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemical speciation and bioavailability >Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily
【24h】

Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily

机译：土壤有机和无机部分中的金属分布：以西西里岛土壤为例

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

The content of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, has been determined in the organic and inorganic fraction of eight soil samples from Sicily. A modified type-Tessier sequential extraction procedure has been used to recognize metals in five different fractions categorised as follows: (a) exchangeable metals, (b) metals bound to carbonates, (c) metals bound to iron and manganese oxides, (d) metals bound to organic matter, and (e) metals in residual fraction. The mineralogical composition of soils samples was characterized by X-ray diffraction. Humic substances were extracted by means of an alkaline extraction procedure. It has been found that both the mineralogical composition and the different content of humic fraction of organic matter in the soils investigated are responsible for the observed trace metal distribution. The obtained data show that a significant amount of trace metals is bound to the organic fraction where different binding sites are present simultaneously. In particular, Pb and Cu seem to be the elements more tightly linked to the organic fraction of soils, whilst cadmium is mostly concentrated into the iron and manganese oxides fraction. The presence of clay minerals in soil is significant for metal distribution, playing a fundamental role in binding metal ions. Besides, it has been observed that the calcophile metal mobility is strongly dependent on the presence of sulfide phases. Applying the Risk Assessment Code to the analyzed soils, it appears that they contain, generally, less than 30% of metals in the exchangeable and carbonate fractions. Calcic brown soil from Piano Zucchi exhibits a medium up to very high risk for Pb, Cd, Co, Zn and Mn. It also been recognized the elevated presence of Cd in the exchangeable and carbonate fractions of andic brown soil on volcanites from Pachino.
机译：测定了来自西西里岛的八个土壤样品的有机和无机组分中的Cd，Co，Cr，Cu，Fe，Mn，Ni，Pb和Zn的含量。已使用改进的Tessier型顺序萃取程序来识别五种不同组分的金属，这些组分分类如下：（a）可交换金属，（b）与碳酸盐结合的金属，（c）与铁和锰的氧化物结合的金属，（d）与有机物结合的金属，以及（e）残留分数中的金属。用X射线衍射对土壤样品的矿物组成进行了表征。腐殖质通过碱性提取程序提取。已经发现，所调查的土壤中的矿物学组成和有机物腐殖质含量的不同均与观察到的痕量金属分布有关。所获得的数据表明，大量痕量金属与同时存在不同结合位点的有机部分结合。尤其是，铅和铜似乎是与土壤有机部分联系更紧密的元素，而镉主要集中在铁和锰的氧化物部分中。土壤中粘土矿物的存在对于金属的分布很重要，在结合金属离子方面起着根本性的作用。此外，已经观察到，亲硅石的金属迁移率强烈依赖于硫化物相的存在。将风险评估规则应用于所分析的土壤，看来它们在可交换和碳酸盐级分中通常含有少于30％的金属。 Piano Zucchi的钙棕色土壤表现出中等的铅，镉，钴，锌和锰风险。人们还认识到，Pachino火山岩上的Andic棕色土壤中可交换的碳酸盐部分中的Cd含量较高。

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