• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Science of the Total Environment >Chemical (C, N, S, black carbon, soot and char) and stable carbon isotope composition of street dusts from a major West African metropolis: Implications for source apportionment and exposure
【24h】

Chemical (C, N, S, black carbon, soot and char) and stable carbon isotope composition of street dusts from a major West African metropolis: Implications for source apportionment and exposure

机译：西非主要大都市街道粉尘的化学成分（碳，氮，硫，黑碳，烟灰和炭）和稳定的碳同位素组成：对污染源分配和暴露的影响

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

Street dust is a major source of pollution and exposure of residents of West Africa to toxic chemicals. There is however, limited knowledge about the chemical composition and sources of street dust in urban areas of sub-Saharan Africa. The total carbon (TC), nitrogen (TN), sulfur (TS) and the stable carbon isotope ratios (delta C-13) contents of street dust sampled from 25 sites distributed across Kumasi (a metropolis in Ghana with a population of ca.2 million) were determined. In addition, black carbon (BC) and their subunits (soot and char) in these samples were also determined. The concentrations of TC, TN and TS in the dusts were 5-71 mg g(-1), 0.3-4.3 mg g(-1) and 0.2-1.4 mg g(-1), respectively. The concentrations of TC, TN and TS were higher than at the background site of the metropolis by a factor of 5.1 (range: 1.7-12), 3.9 (1.1-13) and 2.8 (0.7-5), respectively. The BC, char and soot concentrations in these samples averaged 1.6 mg g(-1) (0.13-4.4), 1.2 mg g(-1) (0.08-3.7) and 0.36 mg g(-1) (0.05-1.5), respectively. The concentrations of BC, char and soot in the street dust were higher than in the background location by factors of 5 (range: 0.8-13), 6 (0.7-17) and 3 (0.5-12), respectively. The TC, TN, TS, BC, soot and char concentrations were positively correlated with each other and with polycyclic aromatic compounds (PAHs, oxygenated PAHs and azaarenes from a previous study), indicating their common origin and fate. The delta C-13 values ranged from -27 to -24 [parts per thousand], with more polluted sites being more depleted in C-13. Based on the chemical composition of the street dusts, the 25 sites could be clustered into four groups by hierarchical cluster analysis which reflect areas of varying anthropogenic influence and, accordingly, exposure to hazardous chemicals. (C) 2018 Elsevier B.V. All rights reserved.
机译：街道灰尘是污染的主要来源，也是西非居民接触有毒化学物质的主要来源。但是，关于撒哈拉以南非洲市区的化学成分和街道粉尘来源的知识有限。从分布在库马西（加纳的一个大都市，人口约25个）的25个地点采样的街道尘埃中的总碳（TC），氮（TN），硫（TS）和稳定碳同位素比（δC-13）含量。 200万）。此外，还测定了这些样品中的黑碳（BC）及其亚基（烟灰和煤焦）。粉尘中TC，TN和TS的浓度分别为5-71 mg g（-1），0.3-4.3 mg g（-1）和0.2-1.4 mg g（-1）。 TC，TN和TS的浓度分别比大都市的背景高5.1倍（范围：1.7-12），3.9（1.1-13）和2.8（0.7-5）。这些样品中的BC，炭和烟灰浓度平均为1.6 mg g（-1）（0.13-4.4），1.2 mg g（-1）（0.08-3.7）和0.36 mg g（-1）（0.05-1.5），分别。街道灰尘中的BC，炭和烟灰浓度分别比背景高5倍（范围：0.8-13），6倍（0.7-17）和3倍（0.5-12）。 TC，TN，TS，BC，烟灰和炭的浓度彼此之间以及与多环芳族化合物（先前研究中的PAH，氧化的PAH和氮杂）呈正相关，表明它们的共同来源和命运。 C-13的变化范围是-27到-24 [千分之几]，C-13中受污染的站点更多。根据街道粉尘的化学成分，可以通过分层聚类分析将这25个地点分为四类，这些聚类分析反映了不同的人为影响区域，并因此暴露于危险化学品。 （C）2018 Elsevier B.V.保留所有权利。

著录项

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