College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
J Hazard Mater. 2017 Jul 15;334:86-92. doi: 10.1016/j.jhazmat.2017.03.064. Epub 2017 Mar 31.
A combination of fluorescence excitation-emission (EEM) spectrophotometry with parallel factor analysis (PARAFAC) and UV-vis spectroscopy was used to assess dissolved organic matter (DOM) release by the wheat straw-derived biochar in various environmental conditions. The results showed that the concentration of dissolved organic carbon (DOC) extracted from the biochar ranged from 435 to 5000mgkg, and the high DOM release would occur under the high temperature and alkaline environmental conditions. Four humic acid-like substances (C1, C2, C4 and C5), one fulvic acid-like substance (C3) and one tryptophan-like substance (C6) were identified by PARAFAC model. The distribution of the PARAFAC components in DOM was distinctively different among various extracts, and mainly composed of humic acid-like and fulvic acid-like material (accounting 55-78% and 10-37%). The high temperature enhanced the high release of humic acid-like DOM from the biochar. Humification index (HIX) of DOM released from the biochar in various extracts at the temperature of 20°C (0.99-1.09) was lower than that at the temperature of 60°C (1.31-1.92). The results obtained in the present study would be beneficial to understand biochar's effects and processes in the possible environmental applications.
采用荧光激发-发射（EEM）分光光度法与平行因子分析（PARAFAC）和紫外可见光谱法相结合的方法，评估了在不同环境条件下小麦秸秆生物炭释放的溶解有机物质（DOM）。结果表明，从生物炭中提取的溶解有机碳（DOC）浓度范围为 435 至 5000mgkg，高温和碱性环境条件下会发生高 DOM 释放。通过 PARAFAC 模型鉴定出四种类腐殖酸物质（C1、C2、C4 和 C5）、一种类富里酸物质（C3）和一种色氨酸类物质（C6）。在不同提取物中，PARAFAC 组分在 DOM 中的分布明显不同，主要由类腐殖酸和类富里酸物质组成（占 55-78%和 10-37%）。高温促进了生物炭中类腐殖酸 DOM 的高释放。在 20°C 温度下从不同提取物中生物炭释放的 DOM 的腐殖化指数（HIX）（0.99-1.09）低于 60°C 温度下的 HIX（1.31-1.92）。本研究的结果将有助于理解生物炭在可能的环境应用中的作用和过程。
