کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4449538 1620497 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization and source analysis of water-soluble inorganic ionic species in PM2.5 in Taiyuan city, China
ترجمه فارسی عنوان
خواص و منبع تجزیه و تحلیل گونه های یونی معدنی محلول در آب در PM2.5 در شهرستان تیایوآن، چین
کلمات کلیدی
PM2.5. یون های معدنی محلول در آب (WSI)؛ تغییرات فصلی. تعادل اسید؛ تجزیه و تحلیل نسبت
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی


• High levels of PM2.5 and water-soluble inorganic ions were found in Taiyuan, a typical coal base of China.
• PM2.5 and water-soluble inorganic ions in Taiyuan varied seasonally and were the highest in winter.
• By the micro-equivalents analysis, the aerosol of PM2.5 in Taiyuan was acidic, except almost neutral in autumn.
• Mg2 + and Ca2 + were not only from soil dust, but also from coal combustion and industry emission.

PM2.5 samples were collected in urban area in Taiyuan for four seasons from August 2009 to April 2010. The Water-soluble inorganic ions (WSI, including F−, Cl−, NO3−, SO42 −, Na+, NH4+, K+, Mg2 +, and Ca2 +) were analyzed by ion chromatography. The daily PM2.5 levels in the field samples varied from 49.90 to 477.93 μg/m3 with the mean of 209.54 μg/m3, which all largely exceeded the PM2.5 24-hour limitation value of 35 μg/m3 in Environmental Protection Administration of United States and 75 μg/m3 in Ministry of Environmental Protection of China. The WSI average concentration was 68.86 μg/m3 and accounted for about 32.86% of PM2.5. As the most abundant anion and cation, SO42 − and NH4+ were 43.53 and 14.78 percent of WSI, respectively. PM2.5 in Taiyuan was acidic by the micro-equivalents concentration methods but nearly neutral in autumn, and the chemical forms of WSI were mainly NH4HSO4, (NH4)2SO4 and NH4NO3. PM2.5 and WSI levels showed obvious seasonal variation and were the highest in winter in all samples. PM2.5, SO42 −, and some coal-related ions such as NH4+ and Cl− were higher in winter than other seasons, which mainly attributed to more coal combustion for power and indoor heating supply. The ratio analysis showed that Mg2 + and Ca2 + were not only from soil dust, but also from coal combustion and industry emission. Biomass burning such as the cornstalk and tree branches led to the highest K+ emission in autumn and summer. Wind had a regular influence on the PM2.5 and WSI, and would transport the soil dust mainly from the northwest and also lead to re-suspension of dust in the air when the wind speed was high. Furthermore, the dustpan topography easily helped the pollutants to concentrate in Taiyuan city, and some coal coking industries might contribute to high PM2.5 and WSI in Taiyuan.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Research - Volume 184, 1 February 2017, Pages 48–55
نویسندگان
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