Biochar-derived dissolved organic matter enhanced the release of residual ciprofloxacin from the soil solid phase

被引：1
作者：
Chen G. [1 ]
Ma J. [2 ]
Yang G. [1 ]
Chen C. [1 ]
Long L. [1 ]
Li L. [3 ]
Gong L. [3 ]
Xu M. [1 ]
Wu J. [1 ]
Song C. [1 ]
Lyu J. [4 ]
机构：
[1] College of Environmental Science, Sichuan Agricultural University, Chengdu
[2] College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya'an
[3] Sichuan Keyuan Engineering Technology Testing Center, Chengdu
[4] College of History Culture and Tourism, Fuyang Normal University
来源：
Chemosphere | 2024年 / 358卷
基金：
中国国家自然科学基金;
关键词：
Ciprofloxacin; Combination characteristics; Dissolved organic matter; Fluorescence quenching; Residue transformation;
D O I：
10.1016/j.chemosphere.2024.142193
中图分类号：
学科分类号：
摘要：
Biochar has been utilized to reduce ciprofloxacin (CIP) residues in soil. However, little is known about the effect of biochar-derived dissolved organic matter (DOM) on residual CIP transformation. Thus, we analyzed the residual soil CIP as influenced by biochar generated from rice straw (RS3 and RS6), pig manure (PM3 and PM6), and cockroach shell (CS3 and CS6) at 300 °C and 600 °C. The three-dimensional excitation-emission matrix (3D-EEM), parallel factor analysis (PARAFAC) and two-dimensional correlation spectral analysis (2D-COS) were used to describe the potential variation in the DOM-CIP interaction. Compared with CK, biochar amendment increased the water-soluble CIP content by 160.7% (RS3), 55.2% (RS6), 534.1% (PM3), 277.5% (PM6), 1160.6% (CS3) and 703.9% (CS6), indicating that the biochar feedstock controlled the soil CIP release. The content of water-soluble CIP was positively correlated with the content of dissolved organic carbon (r = 0.922, p < 0.01) and dissolved organic nitrogen (r = 0.898, p < 0.01), suggesting that the major influence of the water-soluble CIP increase was DOM. The fluorescence quenching experiment showed that the interaction between DOM and CIP triggered static quenching and the creation of a DOM complex. The mean log K of protein-like material (4.977) was higher than that of terrestrial humus-like material (3.491), suggesting that the protein-like material complexed CIP was more stable than the humus-like material. Compared with pyrolysis at 300 °C, pyrolysis at 600 °C decreased the stability of the complex of protein-like material and CIP by 0.44 (RS), 1.689 (PM) and 0.548 (CS). This result suggested that the influence of temperature change was more profound on PM biochar-derived DOM than on RS and CS. These insights are essential for understanding CIP transportation in soil and controlling CIP contamination with biochar. © 2024 Elsevier Ltd
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