High concentrations of polycyclic aromatic hydrocarbons (naphthalene, phenanthrene and pyrene) failed to explain biochar's capacity to reduce soil nitrous oxide emissions

被引:23
作者
Alburquerque, J. A. [1 ]
Sanchez-Monedero, M. A. [1 ]
Roig, A. [1 ]
Cayuela, M. L. [1 ]
机构
[1] CSIC, Ctr Edafol & Biol Aplicada Segura, Dept Soil & Water Conservat & Organ Waste Managem, Murcia 30100, Spain
关键词
Pyrolysis; Organic pollutants; N2O mitigation; PAH; Agricultural soil; CONTAMINATED SOIL; N2O; DENITRIFICATION; CARBON; WATER; TEMPERATURE; TOXICITY; BACTERIA; QUALITY; CO2;
D O I
10.1016/j.envpol.2014.09.014
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The presence of polycyclic aromatic hydrocarbons (PAHs) has been postulated as a mechanism by which biochar might mitigate N2O emissions. We studied whether and to what extent N2O emissions were influenced by the three most abundant PAHs in biochar: naphthalene, phenanthrene and pyrene. We hypothesised that biochars contaminated with PAHs would show a larger N2O mitigation capacity and that increasing PAH concentrations in biochar would lead to higher mitigation potentials. Our results demonstrate that the high-temperature biochar (550 degrees C) had a higher capacity to mitigate soil N2O emissions than the low-temperature biochar (350 degrees C). At low PAH concentrations, PAHs do not significantly contribute to the reductions in soil N2O emissions; while biochar stimulated soil N20 emissions when it was spiked with high concentrations of PAHs. This study suggests that the impact of biochar on soil N20 emissions is due to other compositional and/or structural properties of biochar rather than to PAH concentration. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:72 / 77
页数:6
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