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Journal of Environmental Sciences (China)

Guoqiang Zhang, Hongbo Fu, Jianmin Chen
The α-pinene ozonolysis under the different environmental conditions were observed in a smog chamber. The second-order rate constant (k) was determined to be (7.25±0.06)×10-17 cm3 /(molecule·sec) under 20% of relative humidity (RH) and room temperature. RH showed a marked influence on the α-pinene ozonolysis. The value of k increased with RH increase, which was 1.6 times faster at RH=80% than that at RH=20%. Additionally, the value of k apparently changed in the presence of the aerosol particles. The diesel soot increased the k value...
September 2018: Journal of Environmental Sciences (China)
Shanshan Tang, Narcisse T Tsona, Junyao Li, Lin Du
The influence of a single water molecule on the reaction mechanism and kinetics of hydrogen abstraction from methanol (CH3 OH) by the ClO radical has been investigated using ab initio calculations. The reaction proceeds through two channels: abstraction of the hydroxyl H-atom and methyl H-atom of CH3 OH by ClO, leading to the formation of CH3 O+HOCl (+H2 O) and CH2 OH+HOCl (+H2 O), respectively. In both cases, pre- and post-reactive complexes were located at the entrance and exit channel on the potential energy surfaces...
September 2018: Journal of Environmental Sciences (China)
Xu Yu, Wei Song, Qingqing Yu, Sheng Li, Ming Zhu, Yanli Zhang, Wei Deng, Weiqiang Yang, Zhonghui Huang, Xinhui Bi, Xinming Wang
Chemical speciation of fine particles or PM2.5 collected on filters is still a costly and time-consuming task. In this study, filter-based PM2.5 samples were collected during November-December 2013 at four sites in Guangzhou, and the major components were fast screened (~7min per filter sample) by Attenuated Total Reflectance (ATR)-Fourier Transform Infrared Spectroscopic (FTIR) in comparison with that measured by Organic carbon/Element carbon (OC/EC) analyzer and Ion Chromatography (IC). The concentrations of nitrate, ammonium, sulfate, primary organic carbon (POC) and secondary organic carbon (SOC) measured by OC/EC and IC analyzers were better correlated with their infrared absorption peak heights at 1320cm-1 for nitrate, 1435, 3045 and 3215cm-1 for ammonium, 615cm-1 for sulfate, 690, 760 and 890cm-1 for POC and 1640 and 1660cm-1 for SOC respectively, during polluted days (PM2...
September 2018: Journal of Environmental Sciences (China)
Rongshan Wu, Xiaoming Song, Yingchen Bai, Jie Chen, Qian Zhao, Shuo Liu, Hongbing Xu, Tong Wang, Baihuan Feng, Yi Zhang, Liuju Zhong, Xuemei Wang, Fengchang Wu, Wei Huang
With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised national ambient air quality standards (NAAQS) for particulate matter (PM) in 2012 (GB3095-2012). To assess the effectiveness of current NAAQS for PM on public health in Chinese population, we conducted a meta-analysis on published studies examining the mortality risk of short-term exposure to PM with aerodynamic diameters less than 10 and 2...
September 2018: Journal of Environmental Sciences (China)
Frédéric Ledoux, Cloé Roche, Fabrice Cazier, Charles Beaugard, Dominique Courcot
The influence of in-port ship emissions on gases and PM10 concentrations has been estimated in the port city of Calais, northern France, one of the busiest harbor in Europe, with numerous rotations of ferries or roll-on/roll-off cargo in average per day. NOx , SO2 , O3 and PM10 concentrations were continuously measured over a three-month period, as well as real-time particle size distribution. A rural site located at Cape Gris-Nez, 20km from Calais, was considered to deduce intrinsic contribution of ship emissions at the harbor city...
September 2018: Journal of Environmental Sciences (China)
Cong Hou, Longyi Shao, Chengmei Zhao, Jing Wang, Junxia Liu, Chunmei Geng
Coal combustion in the domestic stoves, which is common in most parts of the Chinese countryside, can release harmful substances into the air and cause health issues. In this study, particles emitted from laboratory stove combustion of the raw powder coals were analyzed for morphologies and chemical compositions by using transmission electron microscopy (TEM) coupled with energy-dispersive X-ray spectrometry (EDX). The coal burning-derived individual particles were classified into two groups: carbonaceous particles (including soot aggregates and organic particles) and non-carbonaceous particles (including sulfate, mineral and metal particles)...
September 2018: Journal of Environmental Sciences (China)
Yanqin Ren, Gehui Wang, Jianjun Li, Can Wu, Cong Cao, Jiayuan Wang, Lu Zhang, Fan Meng, Hong Li
Size-resolved biogenic secondary organic aerosols (BSOA) derived from isoprene and monoterpene photooxidation in Qinghai Lake, Tibetan Plateau (a continental background site) and five cities of China were measured using gas chromatography/mass spectrometry (GC/MS). Concentrations of the determined BSOA are higher in the cities than in the background and are also higher in summer than in winter. Moreover, strong positive correlations (R2 =0.44-0.90) between BSOA and sulfate were found at the six sites, suggesting that anthropogenic pollution (i...
September 2018: Journal of Environmental Sciences (China)
Weiran Li, Yi Chen, Shengrui Tong, Yucong Guo, Yunhong Zhang, Maofa Ge
Rate constants for the reactions of ozone with 1-octen-3-ol, 1-nonen-3-ol and 1-nonen-4-ol have been determined at 298±1K and atmospheric pressure for the first time. The experiments were performed in a 100-L FEP Teflon film bag using absolute rate method; the rate constants were (1.91±0.19)×10-17 , (1.89±0.20)×10-17 , and (0.83±0.08)×10-17 cm3 /(molecule·sec) for 1-octen-3-ol, 1-nonen-3-ol, and 1-nonen-4-ol, respectively. The rate constants have been compared with those of unsaturated alcohols structural homologs, and used to estimate the reaction reactivity...
September 2018: Journal of Environmental Sciences (China)
Jinhe Wang, Xi Zhang, Qing Yang, Kai Zhang, Yue Zheng, Guanhua Zhou
Through field sampling of atmospheric dustfall in regions of Zhuzhou City, China for a period of one year, the deposition fluxes of atmospheric dustfall and five heavy metals contained inside, including Cr, As, Cd, Hg and Pb, were analyzed. Meanwhile the enrichment factor and index methods were used to analyze the pollution characteristics of heavy metals of atmospheric dustfall in Zhuzhou. The annual deposition flux of atmospheric dustfall in Zhuzhou was 50.79 g/(m2 ·year), while the annual deposition fluxes of Cr, As, Cd, Hg and Pb were 9...
September 2018: Journal of Environmental Sciences (China)
Yangang Ren, Jinhe Wang, Benoit Grosselin, Véronique Daële, Abdelwahid Mellouki
The rate constants for the Cl atom reaction with three branched ketones have been measured at 298±2K and 760Torr using the relative rate method in the absence of NO. The rate constants values obtained (in units of 10-10 cm3 /(molecule·sec)) are: k(2-methyl-3-pentanone) =1.07±0.26, k(3-methyl-2-pentanone) =1.21±0.26, and k(4-methyl-2-pentanone) =1.35±0.27. Combining the chemical kinetic data obtained by this study with those reported for other ketones, a revised Structure Activity Relationship (SAR) parameter and R group reactivity (kR ) of R(O)R' and CHx (x=1, 2, 3) group reactivity (kCHx ) toward Cl atoms were proposed...
September 2018: Journal of Environmental Sciences (China)
Ruihan Zong, Xue Yang, Liang Wen, Caihong Xu, Yanhong Zhu, Tianshu Chen, Lan Yao, Liwei Wang, Junmei Zhang, Lingxiao Yang, Xinfeng Wang, Min Shao, Tong Zhu, Likun Xue, Wenxing Wang
Regional ozone (O3 ) pollution has drawn increasing attention in China over the recent decade, but the contributions from urban pollution and biogenic emissions have not been clearly elucidated. To better understand the formation of the regional O3 problem in the North China Plain (NCP), intensive field measurements of O3 and related parameters were conducted at a rural site downwind of Ji'nan, the capital city of Shandong province, in the summer of 2013. Markedly severe O3 pollution was recorded, with the O3 mixing ratios exceeding the Chinese national ambient air quality standard on 28 days (a frequency of 78%) and with a maximum hourly value of 198 ppbv...
September 2018: Journal of Environmental Sciences (China)
Lu Liu, Xinfeng Wang, Jianmin Chen, Likun Xue, Wenxing Wang, Liang Wen, Dandan Li, Tianshu Chen
Peroxyacetyl nitrate (PAN), as a major secondary pollutant, has gained increasing worldwide attentions, but relevant studies in China are still quite limited. During winter of 2015 to summer of 2016, the ambient levels of PAN were measured continuously by an automatic gas chromatograph equipped with an electron capture detector (GC-ECD) analyzer at an urban site in Jinan (China), with related parameters including concentrations of O3 , NO, NO2 , PM2.5 , HONO, the photolysis rate constant of NO2 and meteorological factors observed concurrently...
September 2018: Journal of Environmental Sciences (China)
Yunchen Zhang, Rui Li, Hongbo Fu, Dong Zhou, Jianmin Chen
Volatile organic compounds (VOCs) are a kind of important precursors for ozone photochemical formation. In this study, VOCs were measured from November 5th, 2013 to January 6th, 2014 at the Second Jinshan Industrial Area, Shanghai, China. The results showed that the measured VOCs were dominated by alkanes (41.8%), followed by aromatics (20.1%), alkenes (17.9%), and halo-hydrocarbons (12.5%). The daily trend of the VOC concentration showed a bimodal feature due to the rush-hour traffic in the morning and at nightfall...
September 2018: Journal of Environmental Sciences (China)
Zhenzhen Wang, Rui Li, Lulu Cui, Hongbo Fu, Jun Lin, Jianmin Chen
In this study, iron speciation in five standard clay samples was characterized. Iron mobilization from these clays was then measured in acidic media. For comparison, a commercially available Arizona test dust (ATD) was also observed. The results showed that the free-Fe contents of clays were commonly lower than that of dust aerosols. The components of clays were dominant by the structural Fe held in the aluminosilicate lattice. The iron solubility of the clays were in the order of KGa-2 > SWy-2 > CCa-2 > IMt-2 > NAu-2...
September 2018: Journal of Environmental Sciences (China)
Xin Tian, Pinhua Xie, Jin Xu, Ang Li, Yang Wang, Min Qin, Zhaokun Hu
Yangtze River Delta (YRD) area is one of the important economic zones in China. However, this area faces increasing environmental problems. In this study, we use ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) network in Eastern China to retrieve variations of NO2 , SO2 , and formaldehyde (HCHO) in the YRD area. Three cities of YRD (Hefei, Nanjing, and Shanghai) were selected for long-term observations. This paper presents technical performance and characteristics of instruments, their distribution in YRD, and results of vertical column densities (VCDs) and profiles of NO2 , SO2 , and HCHO...
September 2018: Journal of Environmental Sciences (China)
Xianmang Xu, Jianmin Chen, Chao Zhu, Jiarong Li, Xiao Sui, Lu Liu, Jianfeng Sun
To investigate the fog chemistry along the Yangtze River basin, a field observation experiment was performed from Shanghai to Wuhan during November 2015. Fifteen fog water samples were collected by using a three-stage Caltech Active Strand Cloud water Collector (CASCC). The three-stage CASCC was mounted on the board of a ship. PH, electrical conductivity (EC), H2 O2 , HCHO, S(IV), ten inorganic ions, seven organicacids and sixteen trace metal elements were measured in this study. The pH of fog water samples ranged from weakly acidic (pH4...
September 2018: Journal of Environmental Sciences (China)
Qingyu Zhang, Juwang Fan, Weidong Yang, Fang Ying, Zhen Bao, Yi Sheng, Cheng Lin, Xuan Chen
In this study, the influences of accumulated mileage (deterioration) and technological changes (emission standards) on emission factors (EFs) of regulated pollutants (CO, HC, and NOx) from gasoline passenger vehicles were investigated based on Inspection and Maintenance (I/M) data using the chassis dynamometer method. The accumulated mileage of passenger vehicles was significantly linearly correlated with vehicle age. For most cases, the average EFs of CO, HC and NOx were significantly linearly correlated with accumulated mileage, indicating that emission deterioration had a significant impact on pollutant EFs...
September 2018: Journal of Environmental Sciences (China)
Kai Zhang, Fahe Chai, Zilong Zheng, Qing Yang, Xuecai Zhong, Khanneh Wadinga Fomba, Guangzhu Zhou
In order to understand the size distribution and the main kind of heavy metals in particulate matter on the lead and zinc smelting affected area, particulate matter (PM) and the source samples were collected in Zhuzhou, Hunan Province from December 2011 to January 2012 and the results were discussed and interpreted. Atmospheric particles were collected with different sizes by a cascade impactor. The concentrations of heavy metals in atmospheric particles of different sizes, collected from the air and from factories, were measured using an inductively coupled plasma mass spectrometry (ICP-MS)...
September 2018: Journal of Environmental Sciences (China)
Can Wu, Gehui Wang, Jiayuan Wang, Jianjun Li, Yanqin Ren, Lu Zhang, Cong Cao, Jin Li, Shuagshuang Ge, Yuning Xie, Xinpei Wang, Guoyan Xue
Fireworks burning releases massive fine particles and gaseous pollutants, significantly deteriorating air quality during Chinese Lunar New Year (LNY) period. To investigate the impact of the fireworks burning on the atmospheric aerosol chemistry, 1-hr time resolution of PM2.5 samples in Xi'an during the winter of 2016 including the LNY were collected and detected for inorganic ions, acidity and liquid water content (LWC) of the fine aerosols. PM2.5 during the LNY was 167±87μg/m3 , two times higher than the China National Ambient Air Quality Standard (75μg/m3 )...
September 2018: Journal of Environmental Sciences (China)
Sylvain Billet, Yann Landkocz, Perrine J Martin, Anthony Verdin, Frédéric Ledoux, Capucine Lepers, Véronique André, Fabrice Cazier, François Sichel, Pirouz Shirali, Pierre Gosset, Dominique Courcot
Particulate matter in ambient air constitutes a complex mixture of fine and ultrafine particles composed of various chemical compounds including metals, ions, and organics. A multidisciplinary approach was developed by studying physico-chemical characteristics and mechanisms involved in the toxicity of particulate atmospheric pollution. PM0.3-2.5 and PM2.5 including ultrafine particles were sampled in Dunkerque, a French industrialized seaside city. PM samples were characterized from a chemical and toxicological point of view...
September 2018: Journal of Environmental Sciences (China)
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