...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Acid-base properties of humic and fulvic acids formed during composting
【24h】

Acid-base properties of humic and fulvic acids formed during composting

机译：堆肥过程中形成的腐殖酸和黄腐酸的酸碱性质

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 soil acid-base buffering capacity and the biological availability, mobilization, and transport of macro- and micronutrients, toxic metal ions, and xenobiotic organic cations in soil are strongly influenced by the acid-base properties of humic substances, of which humic and fulvic acids are the major fractions. For these reasons, the proton binding behavior of the humic acid-like (HA) and fulvic acid-like (FA) fractions contained in a compost are believed to be instrumental in its successful performance in soil. In this work, the acid-base properties of the HAS and FAs isolated from a mixture of the sludge residue obtained from olive oil mill wastewater (OMW) evaporated in an open-air pond and tree cuttings (TC) at different stages of composting were investigated by a current potentiometric titration method and the nonideal competitive adsorption (NICA)-Donnan model. The NICA-Donnan model provided an excellent description of the acid-base titration data, and pointed out substantial differences in site density and proton-binding affinity between the HAS and FAs examined. With respect to FAs, HAS were characterized by a smaller content of carboxylic- and phenolic-type groups and their larger affinities for proton binding. Further, HAs featured a greater heterogeneity in carboxylic-type groups than FAs. The composting process increased the content and decreased the proton affinity of carboxylic- and phenolic-type groups of HAs and FAs, and increased the heterogeneity of phenolic-type groups of HAS. As a whole, these effects indicated that the composting process could produce HA and FA fractions with greater cation binding capacities. These results suggest that composting of organic materials improves their agronomic and environmental value by increasing their potential to retain and exchange macro- and micronutrients, and to reduce the bioavailability of organic and inorganic pollutants.
机译：土壤中酸碱的缓冲能力以及土壤中大量和微量营养素，有毒金属离子和异种生物有机阳离子的生物利用度，动员和运输受到腐殖质物质的酸碱特性的强烈影响，腐殖质和黄腐质酸是主要成分。由于这些原因，认为堆肥中所含的腐殖酸样（HA）和黄腐酸样（FA）级分的质子结合行为对其在土壤中的成功发挥了作用。在这项工作中，从在露天堆肥中蒸发的橄榄油厂废水（OMW）和树木屑（TC）的污泥残渣的混合物中分离出的HAS和FAs的酸碱性质分别为堆肥的不同阶段目前的电位滴定法和非理想竞争吸附（NICA）-Donnan模型进行了研究。 NICA-Donnan模型很好地描述了酸碱滴定数据，并指出了所检测的HAS和FA之间位点密度和质子结合亲和力的实质差异。关于FA，HAS的特征是羧基和酚型基团的含量较小，并且它们对质子结合的亲和力更大。此外，HAs具有比FAs更大的羧基类型异质性。堆肥过程增加了HAs和FAs的羧基和酚型基团的含量，降低了质子亲和力，增加了HAS的酚型基团的异质性。总体而言，这些效果表明堆肥过程可以产生具有更高阳离子结合能力的HA和FA级分。这些结果表明，有机材料的堆肥通过增加其保留和交换大量营养素和微量营养素以及降低有机和无机污染物的生物利用度的潜力来改善其农艺和环境价值。

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