...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric environment >Optical properties and oxidative potential of water- and alkaline-soluble brown carbon in smoke particles emitted from laboratory simulated biomass burning
【24h】

Optical properties and oxidative potential of water- and alkaline-soluble brown carbon in smoke particles emitted from laboratory simulated biomass burning

机译：实验室模拟生物质燃烧散发的烟尘中水溶性和碱溶性棕碳的光学性质和氧化势

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Biomass burning (BB) is an important source of brown carbon (BrC) in atmospheric aerosols. The aim of this study is to investigate the light absorbing ability and oxidative potential of BB-derived BrC fractions (including not only the water soluble fraction but the water-insoluble ones). For this purpose, BrC fractions in the smoke particles (PM2.5) generated from burning of crop residues (rice straw, wheat straw, and corn straw) and wood stems (pine wood and Chinese fir) were sequentially extracted and fractionated into water- and alkaline-soluble extracts, and water- and alkaline-soluble humic-like substances (HULISw5 and HULISAS). Their organic carbon (OC) contents, light absorption, and oxidative potential were comparably investigated. The results showed that the OC within water extracts (WSOC) and alkaline extracts (ASOC), and HULISWS and HULISAS accounted for 24.8%-28.5%, 10.7%-15.3%, 12.4%-16.6%, and 2.2%-5.6% of the BB smoke PM2.5 mass, respectively, thereby indicating that BB potentially influenced the atmospheric water-soluble and alkaline-soluble BrC levels. The BrC fractions had similar absorption patterns, but they also exhibited distinct features. BrC SUVA254 decreased in the order of: HULISA.5 (3.68-4.58 m(2)/gC) HULISWS (2.99-3.72 m(2)/gC) WSOC (2.54-2.80 m(2)/gC) ASOC (1.30-2.06 m(2)/gC). BrC MAE365 was in the order of: HULISA5 (1.95-2.40 m(2)/gC) HULISw5 (1.12-1.60 m(2)/gC) WSOC (0.86-1.23 m(2)/gC) and ASOC (0.54-0.95 m(2)/gC). These results suggest that the HULLS fractions exhibited high aromaticity and strong light absorption. Moreover, BB extractable fractions exhibited a strong oxidative potential to generate reactive oxygen species, and the dithiothreitol activity followed the order of: water extracts (12.5-20.6 pmol/min/mu g) alkaline extracts (9.3-16.2 pmol/min/mu m) HULISWS (6.6-10.7 pmol/min/g) HULISAS (3.7-7.1 pmol/min/g). The chemical characteristics of the BB BrC fractions also varied among the biomass types, where the crop residue smoke PM2.5 contained more BrC than wood smoke PM2.5, but the water-soluble BrC in the former generally exhibited weaker light absorption than the latter.
机译：生物质燃烧（BB）是大气气溶胶中褐碳（BrC）的重要来源。这项研究的目的是研究BB衍生的BrC馏分（不仅包括水溶性馏分，还包括水不溶性馏分）的光吸收能力和氧化电位。为此目的，依次提取了因燃烧农作物残渣（稻草，小麦秸秆和玉米秸秆）和木茎（松木和杉木）而产生的烟雾颗粒（PM2.5）中的BrC馏分，并分馏成水，和碱溶性提取物，以及水溶性和碱溶性腐殖质样物质（HULISw5和HULISAS）。比较了它们的有机碳（OC）含量，光吸收和氧化电位。结果显示，水提取物（WSOC）和碱提取物（ASOC）中的OC以及HULISWS和HULISAS分别占24.8％-28.5％，10.7％-15.3％，12.4％-16.6％和2.2％-5.6％ BB烟分别吸收PM2.5质量，因此表明BB可能影响大气中水溶性和碱性可溶性BrC含量。 BrC馏分具有相似的吸收模式，但它们也表现出不同的特征。 BrC SUVA254按以下顺序降低：HULISA.5（3.68-4.58 m（2）/ gC）> HULISWS（2.99-3.72 m（2）/ gC）> WSOC（2.54-2.80 m（2）/ gC）> ASOC （1.30-2.06 m（2）/ gC）。 BrC MAE365的顺序为：HULISA5（1.95-2.40 m（2）/ gC）> HULISw5（1.12-1.60 m（2）/ gC）> WSOC（0.86-1.23 m（2）/ gC）和ASOC（0.54） -0.95 m（2）/ gC）。这些结果表明，HULLS馏分表现出高的芳香性和强的光吸收性。此外，可萃取的BB馏分具有很强的氧化潜力，可产生活性氧，二硫苏糖醇的活性依次为：水提取物（12.5-20.6 pmol / min / mu g）>碱提取物（9.3-16.2 pmol / min / mu） m）> HULISWS（6.6-10.7 pmol / min / g）> HULISAS（3.7-7.1 pmol / min / g）。 BB BrC馏分的化学特性在生物质类型中也有所不同，其中农作物残余烟中的PM2.5比木烟中的PM2.5含量更高，但是前者中的水溶性BrC的吸光度通常比后者弱。 。

著录项

  • 来源
    《Atmospheric environment》 |2018年第12期|48-57|共10页
  • 作者

    Fan Xingjun; Li Meiju; Cao Tao; Cheng Chongchong; Li Feiyue; Xie Yue; Wei Siye; Song Jianzhong; Peng Pingan;

  • 作者单位

    Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang 233100, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang 233100, Peoples R China;

    Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang 233100, Peoples R China;

    Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang 233100, Peoples R China;

    Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang 233100, Peoples R China;

    Minist Environm Protect, State Environm Protect Key Lab Water Environm Sim, Key Lab Water & Atmosphere Guangdong Prov, South China Inst Environm Sci, Guangzhou 510655, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomass burning; Water-soluble brown carbon; Alkaline-soluble brown carbon; Optical property; Oxidative potential;

    机译：生物质燃烧;水溶性棕碳;碱溶棕碳;光学性质;氧化势;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号