College of Water Sciences, Beijing Normal University, Beijing 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Environ Sci (China). 2020 Sep;95:217-224. doi: 10.1016/j.jes.2020.03.030. Epub 2020 May 8.
In order to understand the compositions characteristics of particulate matter with aerodynamic diameter less than 2.5 μm (PM) fraction in road dust (RD) of oasis cities on the edge of Tarim Basin, 30 road dust (RD) samples were collected in Kashi, Cele, and Yutian in the spring, 2018, and RD was collected using the resuspension approach. Eight water-soluble ions, 39 trace elements and 8 fractions of carbon-containing species in PM were analyzed. Ca and Ca were the most abundant ions and elements in RD (7.1% and 9.5%). Cl in RD was affected not only by attributed to saline-alkali soils in oasis cities of the Tarim Basin and dust from Taklimakan Desert but also by human activities. Moreover, the organic carbon/elemental carbon (OC/EC) ratio indicated that carbon components in RD in Cele town mainly come from fossil fuel combustion, while those in Yutian and Kashi mainly come from biomass combustion. It is noteworthy that high Ca in RD was seriously affected by anthropogenic emissions, and high Na and K contents in RD could be derived from soil and desert dust. It was estimated that Cd, Tl, Sn and Cr were emitted from anthropogenic emissions using the enrichment factor. The coefficients of divergence (COD) result indicated that the influence of local emission on road dust emission is greater than that of long-distance transmission. This study is the first time to comprehensively analyze the chemical characteristics of road dust in oasis cities, and the results provides the sources of road dust at the margin of Tarim Basin.
为了了解塔里木盆地边缘绿洲城市道路尘埃（RD）中空气动力学直径小于 2.5μm（PM）颗粒物质的组成特征，于 2018 年春季在喀什、策勒和于田采集了 30 个 RD 样本，采用再悬浮法采集 RD。分析了 PM 中 8 种水溶性离子、39 种微量元素和 8 种含碳物质。RD 中 Ca 和 Ca 是最丰富的离子和元素（7.1%和 9.5%）。RD 中的 Cl 不仅受塔里木盆地绿洲城市盐碱地和塔克拉玛干沙漠尘埃的影响，还受人类活动的影响。此外，有机碳/元素碳（OC/EC）比值表明策勒镇 RD 中的碳成分主要来自化石燃料燃烧，而于田和喀什的 RD 中的碳成分主要来自生物质燃烧。值得注意的是，RD 中的高 Ca 受到人为排放的严重影响，RD 中的高 Na 和 K 含量可能来自土壤和沙漠尘埃。通过富集因子估计 Cd、Tl、Sn 和 Cr 是由人为排放产生的。散度系数（COD）的结果表明，本地排放对道路灰尘排放的影响大于远距离传输的影响。本研究首次全面分析了塔里木盆地边缘绿洲城市道路尘埃的化学特征，结果为塔里木盆地边缘的道路尘埃来源提供了依据。
