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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第5期    总第249期    2015年5月

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文章编号:1672-7207(2015)05-1967-06
可吸入石英粉尘中的羟自由基在磷酸盐缓冲溶液中的释放规律
王明翠1, 2,董发勤2,王彬3,贺小春2,刘立柱3,孙仕勇3,霍婷婷2

(1. 西南科技大学 生命科学与工程学院,四川 绵阳,621010;
2. 西南科技大学 固体废物处理与资源化教育部重点实验室,四川 绵阳,621010;
3. 西南科技大学 环境与资源学院,四川 绵阳,621010
)

摘 要: 定量研究可吸入石英粉尘中的羟自由基(·OH)在磷酸盐缓冲溶液中的释放规律。采用对苯二甲酸-荧光分光光度法,探讨石英粒度、质量浓度、粉-液作用时间以及粉尘新鲜度对羟自由基释放的影响,并分析石英粉尘在缓冲溶液中释放羟自由基的动力学特征。研究结果表明:石英在缓冲溶液中羟自由基的产生呈剂量-效应和时间-效应关系,且颗粒尺寸效应明显,结晶态二氧化硅比非晶态二氧化硅更易产生羟自由基;新鲜石英比陈旧石英更易产生羟自由基;在较短作用时间内释放羟自由基的累积浓度呈对数增长趋势,羟自由基浓度随石英表面(·O—Si)浓度变化而变化,·OH产生的机制可能与石英表面裸露的基团和缓冲溶液发生的复杂化学反应有密切关系。

 

关键词: 羟自由基;可吸入颗粒;石英;荧光光谱;对苯二甲酸

Release of hydroxyl radicals from inhalable quartz dust in phosphate buffer solution
WANG Mingcui1, 2, DONG Faqin2, WANG Bin3, HE Xiaochun2, LIU Lizhu3, SUN Shiyong3, HUO Tingting2

1. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education,
Southwest University of Science and Technology, Mianyang 621010, China;
3. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China

Abstract:The release of hydroxyl radicals from inhalable quartz dust in phosphate buffer solution was studied by direct quantitative method. The terephthalic acid-fluorescence spectrophotometry analysis was used to track the effect of the different grain sizes, mass concentration, powder-liquid reaction times and the quartz freshness on the release of hydroxyl radicals. Moreover, the release kinetics of hydroxyl radicals in the system was also performed. The results show that the content of hydroxyl radicals generation has a dose-response and time-response relationship with the dramatic effect of particle sizes. Furthermore, the crystalline silica and fresh quartz dust generate hydroxyl radicals more easily than the amorphous one and aged quartz dust, respectively. Interestingly, the relationship between the time and the cumulative concentration hydroxyl radicals in initial stage is in accordance with logarithmic function, and the content of hydroxyl radicals is related with the levels of (·O—Si) in the surface of quartz. The mechanism for generation of the hydroxyl radicals in those inhalable quartz dust in the complex matrix can result in the complicated chemical reactions occuring in the surface of quartz particles.

 

Key words: hydroxyl radicals; inhalable particles; quartz; fluorescence spectroscopy; terephthalic acid

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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