College of Ecology and Environment, Hainan University, Haikou 570228, China.
Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China.
Molecules. 2021 Jun 4;26(11):3416. doi: 10.3390/molecules26113416.
Dissolved organic matter (DOM) greatly influences the transformation of nutrients and pollutants in the environment. To investigate the effects of pyrolysis temperatures on the composition and evolution of pyroligneous acid (PA)-derived DOM, DOM solutions extracted from a series of PA derived from eucalyptus at five pyrolysis temperature ranges (240-420 °C) were analysed with Fourier transform infrared spectroscopy, gas chromatography-mass spectroscopy, and fluorescence spectroscopy. Results showed that the dissolved organic carbon content sharply increased ( < 0.05) with an increase in pyrolysis temperature. Analysis of the dissolved organic matter composition showed that humic-acid-like substances (71.34-100%) dominated and other fluorescent components (i.e., fulvic-acid-like, soluble microbial by-products, and proteinlike substances) disappeared at high temperatures (>370 °C). The results of two-dimensional correlation spectroscopic analysis suggested that with increasing pyrolysis temperatures, the humic-acid-like substances became more sensitive than other fluorescent components. This study provides valuable information on the characteristic evolution of PA-derived DOM.
溶解有机质（DOM）对环境中养分和污染物的转化有很大影响。为了研究热解温度对木醋液衍生 DOM 的组成和演化的影响，采用傅里叶变换红外光谱、气相色谱-质谱和荧光光谱对一系列源自桉树的木醋液在五个热解温度范围（240-420°C）下提取的 DOM 溶液进行了分析。结果表明，随着热解温度的升高，溶解有机碳含量急剧增加（<0.05）。对溶解有机质组成的分析表明，腐殖酸类物质（71.34-100%）占主导地位，而其他荧光成分（如富里酸类、可溶性微生物副产物和蛋白类物质）在高温下（>370°C）消失。二维相关光谱分析结果表明，随着热解温度的升高，腐殖酸类物质比其他荧光成分更敏感。本研究为木醋液衍生 DOM 的特征演化提供了有价值的信息。
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