Characteristics and sources of trace elements in PM2.5 in two megacities in Sichuan Basin of southwest China
Characteristics and sources of trace elements in PM2.5 in two megacities in Sichuan Basin of southwest China
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DOI：
10.1016/j.envpol.2018.07.125
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发表时间：
2018-11-01
影响因子：
8.9
通讯作者：
Jiang, Xia
中科院分区：
文献类型：
--
作者：
Wang, Huanbo;Qiao, Baoqing;Jiang, Xia
表征PM中的主要微量元素（2.5）和相关来源在两个特大城市，成都（CD）和重庆（CQ），在中国西南四川盆地，每日下午（2.5）于2014年10月至2015年7月在每个城市的一个城市站点采集样品，并分析其13种微量元素的含量，其中包括4种地壳元素（Al、Ca、Fe和Ti）、八种微量金属（K、Cr、Zn、Cu、Mn、Pb、Ni和V）和As。多种方法，包括相关分析，富集因子，主成分分析，和条件概率函数（CPF），以确定这些元素的潜在来源。结果表明，四川盆地土壤中微量元素含量普遍低于全国其他地区。K和Fe是CD最丰富的元素，年平均浓度分别为720 +/- 357和456 +/- 248 ng m（-3），分别占分析的微量元素总量的34.6%和21.9%。在所有元素中，Ca的浓度最高，年平均值为824 +/- 633 ng m（-3）（占总量的29.1%）。地壳元素含量春季最高，重金属含量季节变化明显，冬季最高，夏季最低。Ti和Al主要来源于土壤，而Cr、Mn、Cu、Zn、Pb、Ni和As主要来源于燃煤、玻璃生产和钢铁生产的工业排放以及汽车尾气排放。(C)2018爱思唯尔有限公司版权所有。
To characterize major trace elements in PM(2.5 )and associated sources in two megacities, Chengdu (CD) and Chongqing (CQ), in Sichuan Basin of southwest China, daily PM(2.5 )samples were collected at one urban site in each city from October 2014 to July 2015 and were analyzed for their contents of thirteen trace elements including four crustal elements (Al, Ca, Fe, and Ti), eight trace metals (K, Cr, Zn, Cu, Mn, Pb, Ni, and V), and As. Multiple approaches including correlation analysis, enrichment factor, principal component analysis, and conditional probability function (CPF) were applied to identify potential sources of these elements. Most of the measured trace elements in Sichuan Basin were found to have lower concentrations than in the other regions of China. K and Fe were the most abundant elements at CD with an annual mean concentrations of 720 +/- 357 and 456 +/- 248 ng m(-3), accounting for 34.6% and 21.9% of the total analyzed trace elements, respectively. Ca presented the highest concentration among all of the elements at CQ with annual mean of 824 +/- 633 ng m(-3) (29.1% of the total). Crustal elements had the highest concentrations in spring while heavy metals had distinct seasonal variations typically with the highest concentrations in winter and the lowest in summer. Ti and Al were identified to be primarily from soil while most of the analyzed heavy metals (Cr, Mn, Cu, Zn, Pb, Ni) and As were from anthro-pogenic sources associated with coal combustion, industrial emission from glassmaking production and iron/steel manufacturing, and non-exhaust vehicle emission. (C) 2018 Elsevier Ltd. All rights reserved.