Seasonal variations and source apportionment of water-soluble inorganic ions in PM2.5 in Nanjing, a megacity in southeastern China

IF 3 4区地球科学 Q2 ENVIRONMENTAL SCIENCES

Journal of Atmospheric Chemistry Pub Date : 2019-03-23 DOI:10.1007/s10874-019-09388-z

Xiaoyu Zhang, Xin Zhao, Guixiang Ji, Rongrong Ying, Yanhong Shan, Yusuo Lin

{"title":"Seasonal variations and source apportionment of water-soluble inorganic ions in PM2.5 in Nanjing, a megacity in southeastern China","authors":"Xiaoyu Zhang, Xin Zhao, Guixiang Ji, Rongrong Ying, Yanhong Shan, Yusuo Lin","doi":"10.1007/s10874-019-09388-z","DOIUrl":null,"url":null,"abstract":"Daily PM2.5 samples were collected in Nanjing, a megacity in southeastern China, for a period of one-half of a month during every season from 2014~2015. Mass concentrations of nine water soluble inorganic ions (F?, Cl?, SO42?, NO3?, Na+, NH4+, K+, Mg2+ and Ca2+) were determined using ion chromatography to identify the chemical characteristics and potential sources of PM2.5. The mass concentrations of daily PM2.5 ranged from 31.0 to 242.9?μg?m?3, with an annual average and standard deviation of 94.4?±?31.1?μg?m?3. The highest seasonal average of PM2.5 concentrations was observed during winter (108.5?±?31.8?μg?m?3), and the lowest average was observed during summer (85.0?±?22.6?μg?m?3). The annual average concentration of total water soluble inorganic ions was 39.82?μg?m?3, accounting for 44.4% of the PM2.5. The seasonal variation in water soluble inorganic ions in PM2.5 reached its maximum during autumn and reached its minimum during spring. Sulfate, nitrate and ammonium were the dominant water soluble inorganic species, with their combined proportion of 82.0% of the total water soluble inorganic ions and 36.8% of the fine particles. Seasonal variations in aerosol acidity and chemical forms of secondary inorganic ions were discussed. The average ratio of NO3?/SO42? was 0.95. According to the results of principal component analysis, secondary sources, burning processes, and airborne dust were the dominant potential sources of PM2.5 in Nanjing.","PeriodicalId":611,"journal":{"name":"Journal of Atmospheric Chemistry","volume":"76 1","pages":"73 - 88"},"PeriodicalIF":3.0000,"publicationDate":"2019-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10874-019-09388-z","citationCount":"16","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Atmospheric Chemistry","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s10874-019-09388-z","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 16

Abstract

Daily PM_2.5 samples were collected in Nanjing, a megacity in southeastern China, for a period of one-half of a month during every season from 2014~2015. Mass concentrations of nine water soluble inorganic ions (F^?, Cl^?, SO₄^2?, NO₃^?, Na⁺, NH₄⁺, K⁺, Mg²⁺ and Ca²⁺) were determined using ion chromatography to identify the chemical characteristics and potential sources of PM_2.5. The mass concentrations of daily PM_2.5 ranged from 31.0 to 242.9?μg?m^?3, with an annual average and standard deviation of 94.4?±?31.1?μg?m^?3. The highest seasonal average of PM_2.5 concentrations was observed during winter (108.5?±?31.8?μg?m^?3), and the lowest average was observed during summer (85.0?±?22.6?μg?m^?3). The annual average concentration of total water soluble inorganic ions was 39.82?μg?m^?3, accounting for 44.4% of the PM_2.5. The seasonal variation in water soluble inorganic ions in PM_2.5 reached its maximum during autumn and reached its minimum during spring. Sulfate, nitrate and ammonium were the dominant water soluble inorganic species, with their combined proportion of 82.0% of the total water soluble inorganic ions and 36.8% of the fine particles. Seasonal variations in aerosol acidity and chemical forms of secondary inorganic ions were discussed. The average ratio of NO₃^?/SO₄^2? was 0.95. According to the results of principal component analysis, secondary sources, burning processes, and airborne dust were the dominant potential sources of PM_2.5 in Nanjing.

Abstract Image

查看原文本刊更多论文

南京特大城市PM2.5中水溶性无机离子的季节变化及来源解析

2014~2015年，在中国东南部特大城市南京采集PM2.5样本，每个季节采集半个月。9种水溶性无机离子(F?, Cl ?, SO42 ?, 3号?， Na+， NH4+， K+， Mg2+和Ca2+)的含量，利用离子色谱法鉴定PM2.5的化学特征和潜在来源。PM2.5的日质量浓度在31.0 - 242.9 μg / m之间。3，年平均值和标准差为94.4±31.1 μg / m。PM2.5浓度的季节平均值在冬季最高(108.5±31.8 μg m?3)，在夏季最低(85.0±22.6 μg m?3)。总水溶性无机离子的年平均浓度为39.82 μg?3、占PM2.5的44.4%。PM2.5中水溶性无机离子的季节变化在秋季最大，在春季最小。水溶性无机离子以硫酸盐、硝酸盐和铵离子为主，占水溶性无机离子总量的82.0%，占细粒离子总量的36.8%。讨论了气溶胶酸度的季节变化和二次无机离子的化学形态。NO3?/SO42?的平均比值是0.95。主成分分析结果表明，二次源、燃烧过程和空气粉尘是南京市PM2.5的主要潜在来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Atmospheric Chemistry 地学-环境科学

CiteScore

4.60

自引率

5.00%

发文量

审稿时长

7.5 months

期刊介绍： The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.