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135 results on '"Xing, Baoshan"'

7. Manure- and straw-derived biochars reduce the ecological risk of PBDE and promote nitrogen cycling by shaping microbiomes in PBDE-contaminated soil

Author

Xiang, Leilei, primary, Harindintwali, Jean Damascene, additional, Wang, Fang, additional, Bian, Yongrong, additional, Zhao, Zhiliang, additional, Wang, Ziquan, additional, Wang, Yu, additional, Mei, Zhi, additional, Jiang, Xin, additional, Schäffer, Andreas, additional, and Xing, Baoshan, additional

Published
2023
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48. Effect of physical forms of soil organic matter on phenanthrene sorption

Author

Pan, Bo, Xing, Baoshan, Tao, Shu, Liu, Wenxin, Lin, Xiumei, Xiao, Yang, Dai, Hancheng, Zhang, Xianming, Zhang, Yanxv, and Yuan, Huishi

Subjects
*HUMUS, *CONFORMATIONAL analysis, *PHENANTHRENE, *HUMIC acid, *POLYCYCLIC aromatic hydrocarbons, *COMPLEX compounds, *ABSORPTION
Abstract

Abstract: The sorption coefficient, K OC, of phenanthrene (PHE) has been reported to vary with different types of organic matter, leading to uncertainties in predicting the environmental behavior of PHE. Among the studies that relate organic matter properties to their sorption characteristics, physical conformation of organic matter is often neglected. In this work, organic matter samples of different physical forms were examined for their sorption characteristics. Dissolved humic acids (DHA) showed significantly higher K OC than the corresponding solid humic acids (SHA) from which the DHAs were made. The K OC of DHAs was found to be related to polarity, whereas K OC of SHAs increased with aliphatic carbon content. Soil particles were treated with H2O2 to remove organic matter, and humic acid was coated on H2O2-treated soil particles to make organo-mineral complexes at pH 4, 7 and 10. Although the nonlinear sorption was apparent for SHAs and H2O2-treated soil particles, the organo-mineral complexes formed using these two components at pH 4, 7 and 10 exhibited relatively linear sorption at organic carbon content, f OC >0.5%. These results indicate that organic matter of the same composition may have different sorption properties due to different physical forms (or conformations). Nonlinear sorption for the complexes formed at pH 4 with lower f OC (<0.5%) was also discussed. [Copyright &y& Elsevier]

Published
2007
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49. Citric acid enhances Ce uptake and accumulation in rice seedlings exposed to CeO 2 nanoparticles and iron plaque attenuates the enhancement.

Author

Bao Y, Ma J, Pan C, Guo A, Li Y, and Xing B

Subjects
Biological Transport drug effects, Cerium pharmacology, Hydroponics, Oryza drug effects, Plant Roots drug effects, Plant Roots metabolism, Seedlings drug effects, Soil Pollutants pharmacology, Cerium metabolism, Citric Acid pharmacology, Iron pharmacology, Nanoparticles metabolism, Oryza metabolism, Seedlings metabolism
Abstract

To assess the role of citric acid, as a typical low-molecular-weight organic acid from root exudates, on cerium (Ce) uptake, accumulation and translocation in rice seedlings (Oryza sativa L.) exposed to two CeO 2 nanoparticles (NPs) (14 nm and 25 nm). A hydroponic experiment was performed under two citric acid levels (0.01 and 0.04 mmol L -1 ) combined with iron plaque presence. Citric acid significantly enhanced surface-Ce, root-Ce and shoot-Ce accumulation, irrespective of NPs size and iron plaque presence. The increased surface-Ce was associated with the promoted interactive attraction between NPs and root surface, and the enhanced NPs dissolution. Surface-Ce (containing crystalline and amorphous fractions of iron plaque) accumulation increased with the increase of citric acid concentrations. However, the enhancement influence of 0.01 mmol L -1 citric acid on root-Ce, shoot-Ce accumulations, rice-Ce distribution and TF root-shoot was more remarkable than citric acid (0.04 mmol L -1 ), which suggested higher food security risk for human health with environment-level citric acid. Iron plaque presence attenuated the enhancement effect of citric acid on rice-Ce accumulation and distribution (containing surface-Ce, root-Ce and shoot-Ce) due to the reduced attractive interaction between NPs and root surface from the effect of Fe 2+ being dissolved by iron plaque. Above effect of citric acid and iron plaque was more remarkable in 25 nm NP than 14 nm NP., (Copyright © 2019 Elsevier Ltd. All rights reserved.)

Published
2020
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50. Impact of hydrochar on rice paddy CH 4 and N 2 O emissions: A comparative study with pyrochar.

Author

Zhou B, Feng Y, Wang Y, Yang L, Xue L, and Xing B

Subjects
Agriculture, Charcoal classification, Oryza metabolism, Soil chemistry, Charcoal toxicity, Fertilizers analysis, Global Warming, Methane analysis, Nitrous Oxide analysis, Oryza drug effects
Abstract

Hydrothermal carbonization (HTC) thermally converts wet biomasses to carbon materials, dramatically reducing energy use for drying and improving solid product yield compared to pyrolysis process. However, researches regarding agricultural usage of hydrochar (HC) are limited. In the present study, the influence of HC amendment on CH 4 and N 2 O emissions, as well as global warming potential (GWP) and greenhouse gas intensity (GHGI) were investigated. Additionally, pyrochar (PC) treatments as well as two char-free control treatments with (CKU) or without (CK) N fertilizer were also included for comparison. Chars were produced from wheat straw (WC) and saw dust (SC) and applied at different rates (0.5% and 3%, w/w). Both hydrochar and pyrochar decreased paddy CH 4 emissions when amended at a lower rate (0.5%) compared to CKU treatment, which was more obvious for pyrochar when applied at the rate of 3%. Contrarily, 3%-HC significantly stimulated CH 4 emissions, which were around 5 and 3 times higher than that of CKU for WC and SC, respectively. Furthermore, hydrochar showed the potential to decrease paddy N 2 O emissions (6.06-32.32%) at both application rates. However, N 2 O emissions with PC treatments varied depending on application rate (20.20-75.76%). GWP and GHGI values of 0.5%-HC and PC treatments were similar, 6.67-25.00% and 3.85-25.00% lower than those of CKU treatment, respectively. However, 3%-HC amendments led to significantly increased GWP and GHGI. This study suggested that application rate of hydrochar used in rice fields should be taken into serious consideration to fulfill its potential in GHGs mitigation and minimize environmental side effects., (Copyright © 2018 Elsevier Ltd. All rights reserved.)

Published
2018
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