• Complex
  • Title
  • Keyword
  • Abstract
  • Scholars
  • Journal
  • ISSN
  • Conference
搜索
High Impact Results & Cited Count Trend for Year Keyword Cloud and Partner Relationship

Query:

学者姓名:程水源

Refining:

Source

Submit Unfold

Co-Author

Submit Unfold

Clean All

Sort by:
Default
  • Default
  • Title
  • Year
  • WOS Cited Count
  • Impact factor
  • Ascending
  • Descending
< Page ,Total 59 >
基于CdSe@CdS/壳聚糖/gC_3N_4复合物的卡那霉素电化学发光适配体传感器
期刊论文 | 2023 , 42 (03) , 305-311 | 分析试验室
Abstract&Keyword Cite

Abstract :

利用核壳型的CdSe@CdS量子点作为发光物质,并用壳聚糖(CS)、类石墨烯氮化碳(gC_3N_4)与CdSe@CdS量子点合成了CdSe@CdS/CS/gC_3N_4复合物,将该复合物修饰至玻碳电极(GCE)表面,将适配体(Apt)的互补DNA链(cDNA)通过化学反应连接到量子点上,Apt与cDNA发生杂交反应而被修饰至电极表面。将辣根过氧化物酶(HRP)固定到该修饰电极表面,构建了检测卡那霉素(Kana)的电化学发光(ECL)适配体传感器。通过生物催化沉淀(BCP)方法实现Kana的检测,溶液中无Kana时,在H_2O_2的存在下,修饰在电极上的HRP可以催化氧化4-氯-1-萘酚(4-CN),在电极表面产生不导电的苯并-4-氯己二烯酮沉淀,导致电化学发光信号明显降低。溶液中存在Kana时,Kana会与Apt特异性结合,部分dsDNA解旋,导致部分HRP从电极表面脱落,BCP反应减弱,导致ECL信号增强,实现目标物质的特异性检测。计算适配体传感器在Kana溶液中的ECL强度(I)与传感器在空白溶液中的ECL强度(I_0)的差值ΔI (I-I_0),并以此作为响应信号。结果显示,ΔI与Kana浓度的对数值在1.0×10~(-8)~1.0×10~(-4) g/L范围呈良好的线性关系,检出限为5 ng/L。该传感器在实际样品测定中具有较好的应用前景。

Keyword :

电化学发光 电化学发光 卡那霉素 卡那霉素 量子点 量子点 适配体 适配体 生物催化沉淀 生物催化沉淀

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 高会莲 , 康天放 , 鲁理平 et al. 基于CdSe@CdS/壳聚糖/gC_3N_4复合物的卡那霉素电化学发光适配体传感器 [J]. | 分析试验室 , 2023 , 42 (03) : 305-311 .
MLA 高会莲 et al. "基于CdSe@CdS/壳聚糖/gC_3N_4复合物的卡那霉素电化学发光适配体传感器" . | 分析试验室 42 . 03 (2023) : 305-311 .
APA 高会莲 , 康天放 , 鲁理平 , 程水源 . 基于CdSe@CdS/壳聚糖/gC_3N_4复合物的卡那霉素电化学发光适配体传感器 . | 分析试验室 , 2023 , 42 (03) , 305-311 .
Export to NoteExpress RIS BibTex
分子印迹电化学发光传感器的制备及其对卡那霉素的测定应用
期刊论文 | 2023 , 59 (3) , 249-256 | 理化检验(化学分册)
Abstract&Keyword Cite

Abstract :

制备了硫化镉量子点-壳聚糖(CdS-CS)复合物修饰的玻碳电极(GCE),记作CdS-CS/GCE.以卡那霉素为模板分子,3-氨基苯硼酸(APBA)为功能单体,采用循环伏安法在CdS-CS/GCE表面电聚合得到了分子印迹聚合物(MIP)膜,所制备的传感器记作MIP/CdS-CS/GCE.卡那霉素可与传感器表面的MIP特异性结合,占据印迹孔穴,阻断共反应剂K2 S2 O8扩散到电极表面的通路,使电化学发光强度减弱.以传感器在空白溶液中的电化学发光强度(I0)与传感器在卡那霉素标准溶液中的电化学发光强度(I)的差值ΔI(ΔI=I0-I)作为响应信号,在优化的试验条件下,响应信号ΔI与卡那霉素浓度的对数值在1.0×10-11~1.0×10-7 mol·L-1内呈线性关系,相关系数为0.9990,检出限(3S/N)为5×10-12 mol·L-1.按标准加入法对实际样品进行回收试验,回收率为99.9%~103%,测定值的相对标准偏差(n=5)为2.5%~4.3%.

Keyword :

分子印迹聚合物 分子印迹聚合物 传感器 传感器 卡那霉素 卡那霉素 电化学发光法 电化学发光法 CdS-CS复合物 CdS-CS复合物

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 孙晨阳 , 康天放 , 鲁理平 et al. 分子印迹电化学发光传感器的制备及其对卡那霉素的测定应用 [J]. | 理化检验(化学分册) , 2023 , 59 (3) : 249-256 .
MLA 孙晨阳 et al. "分子印迹电化学发光传感器的制备及其对卡那霉素的测定应用" . | 理化检验(化学分册) 59 . 3 (2023) : 249-256 .
APA 孙晨阳 , 康天放 , 鲁理平 , 程水源 . 分子印迹电化学发光传感器的制备及其对卡那霉素的测定应用 . | 理化检验(化学分册) , 2023 , 59 (3) , 249-256 .
Export to NoteExpress RIS BibTex
A review of the technology and applications of methods for evaluating the transport of air pollutants SCIE
期刊论文 | 2023 , 123 , 341-349 | JOURNAL OF ENVIRONMENTAL SCIENCES
WoS CC Cited Count: 9
Abstract&Keyword Cite

Abstract :

A variety of methods based on air quality models, including tracer methods, the brute-force method (BFM), decoupled direct method (DDM), high-order decoupled direct method (HDDM), response surface models (RSMs) and so on forth, have been widely used to study the transport of air pollutants. These methods have good applicability for the transport of air pollutants with simple formation mechanisms. However, differences in research conclusions on secondary pollutants with obvious nonlinear characteristics have been reported. For example, the tracer method is suitable for the study of simplified scenarios, while HDDM and RSMs are more suitable for the study for nonlinear pollutants. Multiple observation techniques, including conventional air pollutant observation, lidar observation, air sounding balloons, vehicle-mounted and ship-borne technology, aerial surveys, and remote sensing observations, have been utilized to investigate air pollutant transport characteristics with time resolution as high as 1 sec. In addition, based on a multi-regional input-output model combined with emission inventories, the transfer of air pollutant emissions can be evaluated and applied to study the air pollutant transport characteristics. Observational technologies have advantages in temporal resolution and accuracy, while modeling technologies are more flexible in spatial resolution and research plan setting. In order to accurately quantify the transport characteristics of pollutants, it is necessary to develop a research method for interactive verification of observation and simulation. Quantitative evaluation of the transport of air pollutants from different angles can provide a scientific basis for regional joint prevention and control. (c) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

Keyword :

Transport flux Transport flux Air pollutant transport Air pollutant transport Simulation technology Simulation technology Observation technology Observation technology Transport matrix Transport matrix

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wang, Xiaoqi , Cheng, Shuiyuan , Zhou, Ying et al. A review of the technology and applications of methods for evaluating the transport of air pollutants [J]. | JOURNAL OF ENVIRONMENTAL SCIENCES , 2023 , 123 : 341-349 .
MLA Wang, Xiaoqi et al. "A review of the technology and applications of methods for evaluating the transport of air pollutants" . | JOURNAL OF ENVIRONMENTAL SCIENCES 123 (2023) : 341-349 .
APA Wang, Xiaoqi , Cheng, Shuiyuan , Zhou, Ying , Zhang, Hanyu , Guan, Panbo , Zhang, Zhida et al. A review of the technology and applications of methods for evaluating the transport of air pollutants . | JOURNAL OF ENVIRONMENTAL SCIENCES , 2023 , 123 , 341-349 .
Export to NoteExpress RIS BibTex
The Independent Impacts of PM2.5 Dropping on the Physical and Chemical Properties of Atmosphere over North China Plain in Summer during 2015-2019 SCIE SSCI
期刊论文 | 2022 , 14 (7) | SUSTAINABILITY
WoS CC Cited Count: 1
Abstract&Keyword Cite

Abstract :

Great changes occurred in the physical and chemical properties of the atmosphere in the North China Plain (NCP) in summer caused by PM2.5 dropping from 58 mu g/m(3) in 2015 to 36.0 mu g/m(3) in 2019. In this study, we first applied the WRF-Chem model to quantify the impact of PM2.5 reduction on shortwave radiation reaching the ground (SWDOWN), planetary boundary layer height (PBLH), and the surface concentration of air pollutants (represented by CO). Simulation results obtained an increase of 15.0% in daytime SWDOWN and 9.9% in daytime PBLH, and a decrease of -5.0% in daytime CO concentration. These changes were induced by the varied PM2.5 levels. Moreover, the variation in SWDOWN further led to a rise in the NO2 photolysis rate (JNO(2)) over this region, by 1.82 x 10(-4)similar to 1.91 x 10(-4) s(-1) per year. Afterwards, we employed MCM chemical box model to explore how the JNO(2) increase and the precursor decrease (CO, VOCs, and NOx) influenced O-3 and HO2 radicals. The results revealed that the photolysis rate U) increase would individually cause a change on daytime surface O-3, OH, and HO2 radicals by +9.0%, +18.9%, and +23.7%; the corresponding change induced by the precursor decrease was -2.5%, +1.9%, and -2.3%. At the same time, the integrated impacts of the change in J and precursors cause an increase of +6.3%, +21.1%, and +20.9% for daytime surface O-3, OH, and HO2. Generally, the atmospheric oxidation capacity significantly enhanced during summer in NCP due to the PM2.5 dropping in recent years. This research can help understand atmosphere changes caused by PM2.5 reduction comprehensively.

Keyword :

chemical box model chemical box model atmospheric oxidation capacity atmospheric oxidation capacity WRF-Chem WRF-Chem photolysis rates photolysis rates

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Ou, Shengju , Wei, Wei , Cai, Bin et al. The Independent Impacts of PM2.5 Dropping on the Physical and Chemical Properties of Atmosphere over North China Plain in Summer during 2015-2019 [J]. | SUSTAINABILITY , 2022 , 14 (7) .
MLA Ou, Shengju et al. "The Independent Impacts of PM2.5 Dropping on the Physical and Chemical Properties of Atmosphere over North China Plain in Summer during 2015-2019" . | SUSTAINABILITY 14 . 7 (2022) .
APA Ou, Shengju , Wei, Wei , Cai, Bin , Chen, Saisai , Guan, Panbo , Cheng, Shuiyuan . The Independent Impacts of PM2.5 Dropping on the Physical and Chemical Properties of Atmosphere over North China Plain in Summer during 2015-2019 . | SUSTAINABILITY , 2022 , 14 (7) .
Export to NoteExpress RIS BibTex
La~(3+)掺杂CdS 量子点的卡那霉素电化学发光适配体传感器研究
期刊论文 | 2022 , 34 (03) , 525-532 | 化学研究与应用
Abstract&Keyword Cite

Abstract :

本文合成了La~(3+)掺杂的CdS量子点(CdS:La QDs),以其作为发光材料。将量子点吸附于玻碳电极(GCE)表面。采用卡那霉素(Kana)的适配体(apt)及其互补链(cDNA)制备传感器,使apt与cDNA在电极表面杂交形成双链DNA(dsDNA),然后用氯化血红素(hemin)溶液孵育该修饰电极,使hemin嵌入至dsDNA中,制得Kana电化学发光适配体传感器,记作hemin-dsDNA/CdS:La/GCE。建立了简便、灵敏的检测Kana的电化学发光(ECL)方法,当不存在Kana时,电极表面的hemin作为模拟过氧化物酶会催化溶液中的H_2O_2还原为OH~-,使作为量子点...

Keyword :

La~(3+)离子 La~(3+)离子 CdS量子点 CdS量子点 适配体传感器 适配体传感器 电化学发光 电化学发光 卡那霉素 卡那霉素

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 高会莲 , 康天放 , 鲁理平 et al. La~(3+)掺杂CdS 量子点的卡那霉素电化学发光适配体传感器研究 [J]. | 化学研究与应用 , 2022 , 34 (03) : 525-532 .
MLA 高会莲 et al. "La~(3+)掺杂CdS 量子点的卡那霉素电化学发光适配体传感器研究" . | 化学研究与应用 34 . 03 (2022) : 525-532 .
APA 高会莲 , 康天放 , 鲁理平 , 程水源 . La~(3+)掺杂CdS 量子点的卡那霉素电化学发光适配体传感器研究 . | 化学研究与应用 , 2022 , 34 (03) , 525-532 .
Export to NoteExpress RIS BibTex
[Applying Photochemical Indicators to Analyze Ozone Sensitivity in Handan]. PubMed
期刊论文 | 2021 , 42 (6) , 2691-2698 | Huanjing kexue
Abstract&Keyword Cite

Abstract :

Ozone pollution in Handan has become severe in recent years and in the summer of 2018, the average maximum daily 8-hour average ozone concentration in Handan was 175 μg·m-3 with a maximum of 257 μg·m-3. Ozone concentrations exceeded the National Air Quality Grade Ⅱ Standard in 59% of cases. In this study, the H2O2/HNO3 indicator was applied to analyze summertime ozone sensitivity in Handan using the WRF-CMAQ modeling system. The results showed that H2O2/HNO3 was more appropriate than other ozone indicators, both theoretically and based on simulation outputs. The good simulation effect of CMAQ on H2O2 and HNO3 was attributed to fine emission inventory and grid resolution. The H2O2/HNO3 simulation results showed that the relative importance of a VOCs-limited regime decreased month by month; a VOCs-NO x -mixed-limited regime was dominant in June; and a NO x -limited regime was more dominant in July and August than in June. The remarkable spatial difference in VOCs and NO x emission ratios among the counties of Handan led to differences in ozone sensitivity. The VOCs-limited regime was concentrated in counties where VOCs/NO x emission ratios were lower than 1.7. Southern counties had a NO x -limited regime, where VOCs/NO x emission ratios were higher than 6.9. Counties with VOCs/NO x emission ratios varying from 1.7 to 6.9 were more susceptible to both VOCs and NO x . According to these results, the transition range of HCHO/NO2, O3/HNO3, and O3/NO x ratios were adjusted to 0.35-0.6, 20-35, and 10-25 respectively. Adjusting the transition range of H2O2/(O3+NO2) was not effective, indicating that this indicator may not be applicable to Handan.

Keyword :

WRF-CMAQ WRF-CMAQ photochemical indicator photochemical indicator sensitivity sensitivity ozone ozone Handan City Handan City

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Niu Yuan , Cheng Shui-Yuan , Ou Sheng-Ju et al. [Applying Photochemical Indicators to Analyze Ozone Sensitivity in Handan]. [J]. | Huanjing kexue , 2021 , 42 (6) : 2691-2698 .
MLA Niu Yuan et al. "[Applying Photochemical Indicators to Analyze Ozone Sensitivity in Handan]." . | Huanjing kexue 42 . 6 (2021) : 2691-2698 .
APA Niu Yuan , Cheng Shui-Yuan , Ou Sheng-Ju , Yao Shi-Yin , Shen Ze-Ya , Guan Pan-Bo . [Applying Photochemical Indicators to Analyze Ozone Sensitivity in Handan]. . | Huanjing kexue , 2021 , 42 (6) , 2691-2698 .
Export to NoteExpress RIS BibTex
Temporal and spatial characteristics of PM2.5 transport fluxes of typical inland and coastal cities in China. PubMed CSCD
期刊论文 | 2021 , 103 , 229-245 | Journal of environmental sciences
Abstract&Keyword Cite

Abstract :

Local pollution and the cross-boundary transmission of pollutants between cities have an inevitable impact on the atmosphere. Quantitative assessments of the contribution of transport to pollution in inland and coastal cities are necessary for the implementation of practical, regional, and joint emission control strategies. In this study, the Comprehensive Air Quality Model (CAMx), together with the Weather Research and Forecasting model (WRF), was used to simulate the contributions to pollution of different cities in 2016. The monthly inflow, outflow, and net flux from the ground to the extended layers served as the three main indicators for the analysis of the interactions of PM2.5 transport between adjacent cities. Between inland and coastal cities, the magnitude of inflow and outflow are larger in the former than in the latter. The inflow flux in the inland cities (Beijing and Shijiazhuang) was 10.6 and 10.7 kt/day, respectively, while that in the coastal cities (Tianjin, Shanghai, Hefei, Nanjing, and Hangzhou) was 9.1, 3.3, 5.8, 4.4, and 3.7 kt/day, respectively. In terms of variation over the year, the strongest inflow in the BTH region occurred in April, followed by October, July, and January, while that in the coastal cities in YRD occurred in January, followed by October, April, and July. Therefore, based on the flux intensity calculations and the transport flux pathways, effective joint control measures can be provided with scientific support, and a better understanding of the evolutionary mechanism among inland and coastal cities can be acquired.

Keyword :

modeling system modeling system regional transport regional transport coastal cities coastal cities PM(2.5) flux PM(2.5) flux inland cities inland cities

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Guan Panbo , Wang Xiaoqi , Cheng Shuiyuan et al. Temporal and spatial characteristics of PM2.5 transport fluxes of typical inland and coastal cities in China. [J]. | Journal of environmental sciences , 2021 , 103 : 229-245 .
MLA Guan Panbo et al. "Temporal and spatial characteristics of PM2.5 transport fluxes of typical inland and coastal cities in China." . | Journal of environmental sciences 103 (2021) : 229-245 .
APA Guan Panbo , Wang Xiaoqi , Cheng Shuiyuan , Zhang Hanyu . Temporal and spatial characteristics of PM2.5 transport fluxes of typical inland and coastal cities in China. . | Journal of environmental sciences , 2021 , 103 , 229-245 .
Export to NoteExpress RIS BibTex
Key factors influencing the formation of sulfate aerosol on the surface of mineral aerosols: Insights from laboratory simulations and ACSM measurements SCIE
期刊论文 | 2021 , 253 | ATMOSPHERIC ENVIRONMENT
WoS CC Cited Count: 6
Abstract&Keyword Cite

Abstract :

A significant technique of combining simulation experiments with a long-term real-time field measurement was first deployed to explore impacts of various environmental factors on formations of sulfate aerosol on the surface of mineral aerosols as MgO in the different reaction systems, and synergistic impacts of these environmental factors on the formation of sulfate aerosols in the different seasonal systems, especially in haze days. Meanwhile, a new correction technique was developed to estimate the effective reaction area and initial uptake coefficient of SO2 on the MgO aerosol surfaces. The significant results showed that the reactions of SO2 on the MgO aerosol surfaces in the system of SO2-MgO-dark could produce a small amount of sulfate and a large amount of sulfite and bisulfite, while in the systems of SO2-MgO-h? and SO2-MgO-O3 produce a large amount of sulfate and a small amount of sulfite and bisulfite. The impacts of temperature T and relative humidity RH on the sulfate formation on MgO aerosol surfaces showed a single-peak mode under the UV light condition, respectively. The sensitivities of these environmental factors to the sulfate aerosol formation were found to follow the order of RH > UV >T > O3 > SO2. The revised initial uptake coefficient ?0.REV of SO2 on the MgO aerosols was always between ?0.BET and ?0.GEO, and much closer to actual value. The heterogeneous reaction mechanisms of SO2 on the MgO aerosol surfaces in the different reaction systems were obviously different. In the presence of water, light irradiation and O3 exerted crucially significant roles in promoting sulfate heterogeneous formation. The various environmental factors in the different seasonal systems, especially in haze days, showed different synergistic effects on sulfate aerosol formations. The sulfate aerosol formations in haze days were mostly impacted by RH, T, O3, and SO2 in spring, RH in summer, RH, T, and SO2 in autumn, and RH and SO2 in winter. The study will provide significant scientific bases for understanding and controlling haze pollution formation.

Keyword :

Uptake coefficient Uptake coefficient Synergistic effect Synergistic effect Sensitive factors Sensitive factors Mineral aerosol Mineral aerosol Sulfate aerosol Sulfate aerosol Haze days Haze days

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Han, Lihui , Liu, Xinhang , Chen, Yuanyuan et al. Key factors influencing the formation of sulfate aerosol on the surface of mineral aerosols: Insights from laboratory simulations and ACSM measurements [J]. | ATMOSPHERIC ENVIRONMENT , 2021 , 253 .
MLA Han, Lihui et al. "Key factors influencing the formation of sulfate aerosol on the surface of mineral aerosols: Insights from laboratory simulations and ACSM measurements" . | ATMOSPHERIC ENVIRONMENT 253 (2021) .
APA Han, Lihui , Liu, Xinhang , Chen, Yuanyuan , Xiang, Xin , Cheng, Shuiyuan , Wang, Haiyan . Key factors influencing the formation of sulfate aerosol on the surface of mineral aerosols: Insights from laboratory simulations and ACSM measurements . | ATMOSPHERIC ENVIRONMENT , 2021 , 253 .
Export to NoteExpress RIS BibTex
武安市PM2.5及其二次水溶性无机离子污染特征和区域来源解析 CSCD
期刊论文 | 2021 , 47 (6) , 644-654 | 北京工业大学学报
Abstract&Keyword Cite

Abstract :

武安市是以钢铁立市的典型重工业城市.为研究武安市PM2.5的污染特征和区域来源解析,对武安非采暖期(2018年10月)和采暖期(2019年1月)进行大气PM2.5样品的采集和组分测试,并利用CAMx-PSAT模型模拟结果分析区域源排放对武安PM2.5及其二次水溶性无机离子(SO2-4、NO3-、NH4+)的质量浓度贡献.测试结果表明,武安PM2.5污染严重,平均质量浓度为113.5μg/m3,采暖期PM2.5污染水平高于非采暖期;SO2-4、NO3-和NH4+的平均质量浓度占PM2.5总质量浓度的41.1%,是PM2.5重要组成部分;SO2-4、NO3-和NH4+质量浓度表现为采暖期高于非采暖期;NO3-与SO2-4质量浓度比值在采暖期和非采暖期均小于1,表明燃煤烟尘等固定源贡献相对较大;随着PM2.5污染等级的升高,SO2-4、NO3-和NH4+质量浓度明显增大,达到重污染天时,SO2-4、NO3-和NH4+质量浓度增至最高.模拟结果显示,武安城区PM2.5污染是由本地污染源排放和外来污染物区域传输共同作用的结果,本地污染源排放占主导地位;冶金源排放对PM2.5、NO3-和SO2-4质量浓度贡献影响最大;农业源排放是NH4+质量浓度的主要污染来源;采暖期的居民源排放对PM2.5和SO2-4、NO3-、NH4+质量浓度贡献率相比于非采暖期出现大幅度增加.外来工业源和机动车源对武安PM2.5质量浓度贡献较为突出.

Keyword :

二次水溶性无机离子 二次水溶性无机离子 武安市 武安市 PM2.5 PM2.5 重工业城市 重工业城市 CAMx-PSAT模型 CAMx-PSAT模型 区域来源解析 区域来源解析

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 姚诗音 , 韩力慧 , 郭改仲 et al. 武安市PM2.5及其二次水溶性无机离子污染特征和区域来源解析 [J]. | 北京工业大学学报 , 2021 , 47 (6) : 644-654 .
MLA 姚诗音 et al. "武安市PM2.5及其二次水溶性无机离子污染特征和区域来源解析" . | 北京工业大学学报 47 . 6 (2021) : 644-654 .
APA 姚诗音 , 韩力慧 , 郭改仲 , 程水源 , 王传达 . 武安市PM2.5及其二次水溶性无机离子污染特征和区域来源解析 . | 北京工业大学学报 , 2021 , 47 (6) , 644-654 .
Export to NoteExpress RIS BibTex
Insights into atmospheric oxidation capacity and its impact on PM2.5 in megacity Beijing via volatile organic compounds measurements EI
期刊论文 | 2021 , 258 | Atmospheric Research
Abstract&Keyword Cite

Abstract :

This study conducted a VOCs monitoring campaign in Jul and Oct of 2018, Jan and Apr of 2019 in Beijing urban area, to explore the atmospheric oxidation capacity and its impact on PM2.5 there through investigating the chemical behaviors of VOCs at a 1-h time resolution. We totally detected 53 VOCs in the atmosphere over Beijing, sum of them (TVOCs) reaching 29.0 ± 12.9, 47.6 ± 29.4, 45.7 ± 56.4 and 35.8 ± 19.3 ppb (mol/mol) in Jul, Oct, Jan and Apr respectively. The gap between VOCs and CO diurnal amplitudes presented the trend of Jul > Oct and Apr > Jan, which implies the more chemical loss of VOCs in non-winter seasons compared to winter. Then, according to the notable difference in OH- and O3- reactivity of various VOCs, hourly OH exposure ([OH]Δt), O3 exposure ([O3]Δt) and OH concentration were estimated. In result, in Jul, Oct, Jan and Apr, the daily [OH]Δt was 10.39 ± 4.95, 11.10 ± 6.01, 6.39 ± 3.74 and 8.96 ± 5.05 × 1010 molecules·s·cm−3, the nighttime [O3]Δt was 9.43 ± 2.83, 5.22 ± 3.62, 5.79 ± 3.65 and 8.60 ± 4.74 × 1015 molecules·s·cm−3, and the daily OH was 9.76 ± 5.17, 5.11 ± 2.98, 2.95 ± 2.18 and 6.26 ± 3.18 × 106 molecules·cm−3, in respective. The OH peak magnitudes agreed well with the OH measured in-site, which indicates the reliability of our estimates on the oxidation capacity of atmosphere over Beijing. During our studied periods, [OH]Δt, OH and atmospheric oxidability combining OH and O3 (ACO) were all positively related to PM2.5 in Jul and Apr; only [OH]Δt was positively related to PM2.5 in Oct; while [OH]Δt, OH and ACO were all negatively related to PM2.5 in Jan. The proportion of SO2 and VOCs oxidized through gaseous OH reactions was found to increase with PM2.5 increasing in non-winter seasons, but decrease with PM2.5 increasing in winter. It means that high PM2.5 concentrations are attributed more to gas-phase oxidations in non-winter seasons and potentially boosted by photochemistry in summer and spring. But, in winter high PM2.5 concentrations effectively inhibit photolysis reactions and weaken atmospheric oxidation capacity, which makes high PM2.5 less dependent on the gas-phase oxidations. © 2021 Elsevier B.V.

Keyword :

Volatile organic compounds Volatile organic compounds Gas chromatography Gas chromatography Free radicals Free radicals Oxidation Oxidation Molecules Molecules Atmospheric chemistry Atmospheric chemistry

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wei, Wei , Wang, Yue , Bai, Hongxiang et al. Insights into atmospheric oxidation capacity and its impact on PM2.5 in megacity Beijing via volatile organic compounds measurements [J]. | Atmospheric Research , 2021 , 258 .
MLA Wei, Wei et al. "Insights into atmospheric oxidation capacity and its impact on PM2.5 in megacity Beijing via volatile organic compounds measurements" . | Atmospheric Research 258 (2021) .
APA Wei, Wei , Wang, Yue , Bai, Hongxiang , Wang, Xiaoqi , Cheng, Shuiyuan , Wang, Litao . Insights into atmospheric oxidation capacity and its impact on PM2.5 in megacity Beijing via volatile organic compounds measurements . | Atmospheric Research , 2021 , 258 .
Export to NoteExpress RIS BibTex
10| 20| 50 per page
< Page ,Total 59 >

Export

Results:

Selected

to

Format:
Online/Total:298/6251793
Address:BJUT Library(100 Pingleyuan,Chaoyang District,Beijing 100124, China Post Code:100124) Contact Us:010-67392185
Copyright:BJUT Library Technical Support:Beijing Aegean Software Co., Ltd.