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| Effects of hydrofluoric acid treatment on the structure of organic matter of corn straw before and after fermentation |
| Received:November 10, 2022 |
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| KeyWord:organic matter;mineral;hydrofluoric acid;lignin;carbon isotope;13C NMR |
| Author Name | Affiliation | E-mail | | SONG Xin | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | XU Hanjie | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | LEI Chencen | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | ZHANG Yu | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | | | LI Fangfang | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China | 497466635@qq.com |
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| Abstract: |
| To verify whether or not hydrofluoric acid（HF）treatment changed the nature and structure of organic matter of corn straw, this study applied three HF concentrations（0, 2%, and 10%）to corn straw before and after fermentation and analyzed organic matter in the acid-treated liquid and solid samples by combining common chemical characterization methods, molecular biomarkers, and stable carbon isotope（δ13C）ratios. Results showed that, unlike the organic carbon content of corn straw, its organic nitrogen content rose by 1.15–1.51 times, which decreased its C / N ratio. However, the content of organic carbon and organic nitrogen did not change with the HF concentrations. The δ13C values of organic matter of corn straws before and after fermentation were -12.83‰ ±0.25‰ and -13.63‰ ±0.09‰, respectively. The HF concentrations did not significantly change the δ13C values. The total quantity of pre- and post-fermentative lignin was（18.81 ±7.44）mg · g-1 and（12.01 ±1.75）mg · g-1, respectively. The degradation and source parameters of lignin did not significantly differ before and after the HF treatment. We concluded that the HF treatment reduced the dissolved organic matter and preferentially degraded oxygen groups but did not significantly change the lignin structure of fermentative corn straw. |
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