Long-term biochar addition alters the characteristics but not the chlorine reactivity of soil-derived dissolved organic matter

文献类型： 外文期刊

第一作者： Cai, Wan

作者： Cai, Wan;Zhang, Peng;Li, Li-Ping;Wang, Jun-Jian;Du, Zhang-Liu;Zhang, Ai-Ping;He, Chen;Shi, Quan;Tian, Li-Qiao;Li, Li-Ping

作者机构：

关键词： Biochar amendment; Water-extractable organic matter; Disinfection by-products; Formation; Toxicity

期刊名称：WATER RESEARCH （ 影响因子：11.236； 五年影响因子：11.547 ）

ISSN： 0043-1354

年卷期： 2020 年 185 卷

页码：

收录情况： SCI

摘要： Biochar is widely and increasingly applied to farmlands. However, it remains unclear how long-term biochar addition alters the characteristics and chlorine reactivity of soil-derived dissolved organic matter (DOM), an important terrestrial disinfection byproduct (DBP) precursor in watersheds. Here, we analyzed the spectroscopic and molecular-level characteristics of soil-derived DOM and the formation and toxicity of DBP mixtures from DOM chlorination for two long-term (5 and 11 years) biochar addition experimental farmlands. As indicated by spectroscopic indices and Fourier transform ion cyclotron resonance mass spectrometry analyses, 11 years of biochar addition could increase the humic-like and aromatic and condensed aromatic DOM and decrease the microbial-derived DOM, while 5 years of biochar addition at the other site did not. The response of condensed aromatic dissolved black carbon did not increase with increasing cumulative biochar dose but appeared to be affected by biochar aging time. Despite the possible increase in aromatic DOM, biochar addition neither increased the reactivity of DOM in forming trihalomethanes, haloacetonitriles, chloral hydrates, or haloketones nor significantly increased the microtoxicity or genotoxicity of the DBP mixture. This study indicates that biochar addition in watersheds may not deteriorate the drinking water quality via the export of terrestrial DBP precursors like wildfire events. (C) 2020 Elsevier Ltd. All rights reserved.

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