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Source apportionment of volatile organic compounds in urban areas of South Texas using positive matrix factorization.

机译:使用正矩阵分解对南德克萨斯市区的挥发性有机物进行源解析。

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摘要

Volatile organic compounds are major precursors of photochemical ozone in the troposphere. With the recently revised National Ambient Air Quality Standards (NAAQS) for ozone, identification and quantification of major VOC sources is vital from a policy maker's standpoint. The objective of this study was to apportion VOC concentrations measured in the urban regions of South Texas including Corpus Christi, Harlingen and Laredo. The VOC speciation data measured during 2002--2006 at seven continuous ambient monitoring stations (CAMS) maintained and operated by the Texas Commission on Environmental Quality (TCEQ) was used in this source apportionment analysis using positive matrix factorization (PMF). Conditional probability function (CPF) analysis was performed by coupling the wind data with the PMF apportioned factors to locate the possible sources or source regions.;In the Corpus Christi urban airshed, natural gas was identified as the major contributor of VOC emissions and the percentage contribution at each of the site varied from 31% to 38%. Refinery processes and petrochemical production were the other major sources with percentage contribution that ranged from 15% to 22%. CPF identified the petrochemical refineries located near the monitoring sites to be the major contributors of VOCs measured in the Corpus Christi urban airshed.;The Harlingen region consisted of three VOC monitoring sites which were located in Brownsville, Edinburg and Mission, Texas. At the Brownsville site vehicle exhaust was identified as the major contributor accounting for 34.6% of the apportioned VOC concentrations. CPF analysis indicated that the vehicle exhaust sources identified in Brownsville were predominantly from the west in Mexico close to the international border. Whereas at Edinburg and Mission, natural gas was identified as the major sources contributing 51.4% and 45.3%, respectively. In addition, refrigerant (8--12%) and fugitive emissions (12--15%) were identified as minor sources predominantly from small businesses and residential areas.;Natural gas was also identified to be a major source responsible for the ambient VOC measured in the Laredo region (30% to 55%). At the Laredo Bridge site, vehicle emission related profiles such as vehicle exhaust, unburned gasoline, and evaporative emissions were found to contribute to a total of 66.3% of the total measured VOC concentration. CPF analysis showed that most of the vehicle exhausts came from the east side of the Laredo Bridge monitoring site, located close to an international bridge crossing with high traffic volume to and from Mexico.
机译:挥发性有机化合物是对流层中光化学臭氧的主要前体。随着最近修订的《国家臭氧环境空气质量标准》(NAAQS),从政策制定者的角度出发,识别和量化主要VOC来源至关重要。这项研究的目的是分配在德克萨斯州南部市区(包括科珀斯克里斯蒂市,哈林根市和拉雷多市)测量的VOC浓度。使用正矩阵分解(PMF)在此源分配分析中使用了2002年至2006年期间由德克萨斯州环境质量委员会(TCEQ)维护和运营的七个连续环境监测站(CAMS)测得的VOC形态数据。通过将风数据与PMF分配因子耦合以进行可能的源或源区域定位,来进行条件概率函数(CPF)分析;在科珀斯克里斯蒂市城市流域中,天然气被确定为VOC排放量和百分比的主要来源每个站点的贡献从31%到38%不等。炼油工艺和石化产品是其他主要来源,贡献百分比从15%到22%。 CPF确定了在监测点附近的石化炼油厂是在科珀斯克里斯蒂市城市流域测得的挥发性有机化合物的主要来源。哈林根地区包括三个挥发性有机化合物监测点,分别位于爱丁堡的布朗斯维尔和德克萨斯州米森。在布朗斯维尔现场,汽车尾气被确定为主要贡献者,占所分配VOC浓度的34.6%。 CPF分析表明,在布朗斯维尔发现的汽车尾气主要来自墨西哥西部靠近国际边界的地方。在爱丁堡和米申,天然气被确定为主要来源,分别占51.4%和45.3%。此外,制冷剂(8--12%)和逃逸排放物(12--15%)被确定为次要来源,主要来自小型企业和居民区;天然气也被确定为造成环境VOC的主要来源在拉雷多地区(30%至55%)进行测量。在拉雷多大桥工地,发现与车辆排放有关的概况,例如车辆废气,未燃烧的汽油和蒸发排放物,占总测量的VOC浓度的66.3%。 CPF分析显示,大部分车辆废气来自拉雷多大桥监测站的东侧,该监测站靠近国际大桥,墨西哥的来往交通量很大。

著录项

  • 作者

    Yang, Ci.;

  • 作者单位

    Texas A&M University - Kingsville.;

  • 授予单位 Texas A&M University - Kingsville.;
  • 学科 Engineering Environmental.
  • 学位 M.S.
  • 年度 2009
  • 页码 70 p.
  • 总页数 70
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:37:49

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