黄色视频不卡_午夜福利免费观看在线_亚洲国产精品999在线_欧美绝顶高潮抽搐喷水_久久精品成人免费网站_晚上一个人看的免费电影_国产又色又爽无遮挡免费看_成人国产av品久久久

作者： Yanyu Lu, Guangchun Shan, Junhao Huang, Qunliang Li

School of Chemistry and Chemical Engineering, Guangxi University, Nanning, China

 

摘要：Dissolved organic matter (DOM) is a crucial indicator of compost maturity and stability. Different pools of DOM fractions may function distinctly from one another and show unique properties in the transformation of organic matter and microbial activity. In this work, compost DOM was fractionated and the properties of individual DOM fractions including humic acids (HA), fulvic acids (FA) and hydrophilic compounds (Hi) were analyzed. The pools of HA, FA and Hi were studied via elemental analysis, FTIR and UV–Vis spectroscopy, and colloidal properties like particle size and zeta potential were characterized as well. Compared to HA or FA, Hi pool had a higher content of nitrogenous compound, higher saturated degree and more easily oxidized capacity. As composting proceeded, the aromaticity of HA and FA was higher and higher while Hi exhibited only a very slight change. The colloidal analysis indicated that the particle size of DOM subfractions gradually decreased. Hi compounds from matured compost had a good application potential in cations absorption. Taken together, these results provide valuable insights into the evolution and characteristics of DOM fractions during a composting process of dairy manure and Chinese herbal residues.