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Particle size distribution and perchlorate levels in settled dust from urban roads, parks, and roofs in Chengdu, China

机译:中国成都城市道路,公园和屋顶沉降尘埃的粒径分布和高氯酸盐水平

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A total of 27 settled dust samples were collected from urban roads, parks, and roofs in Chengdu, China to investigate particle size distribution and perchlorate levels in different size fractions. Briefly, fine particle size fractions (<250 mu m) were the dominant composition in the settled dust samples, with mean percentages of 80.2%, 69.5%, and 77.2% for the urban roads, roofs, and the parks, respectively. Perchlorate was detected in all of the size-fractionated dust samples, with concentrations ranging from 73.0 to 6160 ng g(-1), and the median perchlorate levels increased with decreasing particle size. The perchlorate level in the finest fraction (<63 mu m) was significantly higher than those in the coarser fractions. To our knowledge, this is the first report on perchlorate concentrations in different particle size fractions. The calculated perchlorate loadings revealed that perchlorate was mainly associated with finer particles (<125 mu m). An exposure assessment indicated that exposure to perchlorate via settled road dust intake is safe to both children and adults in Chengdu, China. However, due to perchlorate mainly existing in fine particles, there is a potential for perchlorate to transfer into surface water and the atmosphere by runoff and wind erosion or traffic emission, and this could act as an important perchlorate pollution source for the indoor environment, and merits further study.
机译:总共从中国成都的城市道路,公园和屋顶收集了27个沉降的尘土样品,以调查不同尺寸分数的粒径分布和高氯酸盐含量。简而言之,细小颗粒部分(<250微米)是沉降灰尘样品中的主要成分,城市道路,屋顶和公园的平均百分比分别为80.2%,69.5%和77.2%。在所有大小分级的粉尘样品中均检测到高氯酸盐,浓度范围为73.0至6160 ng g(-1),并且高氯酸盐的中值水平随着粒径的减小而增加。最细馏分(<63微米)中的高氯酸盐水平明显高于较粗馏分中的。据我们所知,这是有关不同粒度级分中高氯酸盐浓度的第一份报告。计算得出的高氯酸盐装载量表明,高氯酸盐主要与较细的颗粒(<125微米)有关。暴露评估表明,在中国成都,通过沉降的道路灰尘摄入而暴露于高氯酸盐对儿童和成人都是安全的。但是,由于高氯酸盐主要存在于细颗粒中,因此高氯酸盐有可能通过径流和风蚀或交通排放而转移到地表水和大气中,这可能成为室内环境中重要的高氯酸盐污染源,并且值得进一步研究。

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