堆肥衍生有机物的氧化还原特性及其与极性和分子量的关系。
Redox properties of compost-derived organic matter and their association with polarity and molecular weight.
机构信息
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China.
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China.
出版信息
Sci Total Environ. 2019 May 15;665:920-928. doi: 10.1016/j.scitotenv.2019.02.164. Epub 2019 Feb 14.
Compost-derived dissolved organic matter (DOM), which has a wide distribution of molecular weight (MW) and polarity, has a potential application in the remediation of the contaminated soil due to its redox-active functional groups. Composting treatment can change the MW and polarity of the DOM through microbial transformation and degradation. However, the relationship between the redox properties of compost-derived DOM and its MW and polarity is still unclear. DOM was extracted from municipal solid wastes with different composting times in this study, and it was further fractionated into humic acids (HA), fulvic acids (FA) and hydrophilic (HyI) fractions based on its hydrophobicity and XAD-8 resin. Electron transfer capacities [including electron accepting capacities (EAC) and electron donating capacities (EDC)] of the HA, FA and HyI fractions and their associations with polarity and MW were studied. The results showed that the EAC of the HA, FA and HyI all increased after composting. The EDC of the HA and HyI exhibited an increasing trend as well, though that of the FA decreased remarkably after composting. The MW, polarity and redox-active functional groups of the HA, FA and HyI fractions were determined using high performance liquid chromatography and excitation-emission matrix fluorescence spectra coupled with parallel factor analysis. The result showed that the quinone-like groups were mainly detected in the medium MW and transphilic sub-fractions of the HA, FA and HyI, and were the main functional groups responsible for the EAC. The low MW sub-fractions, which consisted mainly of tyrosine-like matter, were the main functional components accounted for the EDC. The results advance our understanding of the influence of MW and polarity on the redox properties of organic substances, and facilitate to reveal the important redox-active functional groups when compost is utilized to remediate the contaminated soil.
堆肥衍生的溶解性有机质（DOM）具有广泛的分子量（MW）和极性分布，由于其具有氧化还原活性官能团，因此在污染土壤修复中具有潜在的应用。堆肥处理可以通过微生物转化和降解来改变 DOM 的 MW 和极性。然而，堆肥衍生 DOM 的氧化还原性质与其 MW 和极性之间的关系尚不清楚。本研究从不同堆肥时间的城市固体废物中提取 DOM，并根据其疏水性和 XAD-8 树脂进一步分为腐殖酸（HA）、富里酸（FA）和亲水性（HyI）组分。研究了 HA、FA 和 HyI 组分的电子转移能力[包括电子接受能力（EAC）和电子供体能力（EDC）]及其与极性和 MW 的关系。结果表明，HA、FA 和 HyI 的 EAC 在堆肥后均增加。HA 和 HyI 的 EDC 也呈上升趋势，而 FA 的 EDC 则在堆肥后明显下降。使用高效液相色谱和激发发射矩阵荧光光谱结合平行因子分析，测定了 HA、FA 和 HyI 各组分的 MW、极性和氧化还原活性官能团。结果表明，醌类物质主要存在于 HA、FA 和 HyI 的中 MW 和 transphilic 亚组分中，是 EAC 的主要官能团。主要由酪氨酸样物质组成的低 MW 亚组分是 EDC 的主要功能成分。研究结果提高了我们对 MW 和极性对有机物质氧化还原性质的影响的认识，有助于揭示堆肥用于修复污染土壤时重要的氧化还原活性官能团。
Zotero 插件