DOI: 10.1016/j.atmosenv.2017.12.030
Scopus记录号: 2-s2.0-85039973792
论文题名: Investigating hydrogen peroxide in rainwater of a typical midsized city in tropical Brazil using a novel application of a fluorometric method
作者: Scaramboni C ; , Crispim C ; P ; , Toledo J ; C ; , Jr ; , Campos M ; L ; A ; M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 176 起始页码: 201
结束页码: 208
语种: 英语
英文关键词: 2′,7′-Dichlorofluorescein
; Natural waters
; Nitrate
; Rainwater
; Sulfate
; Vehicle policy
Scopus关键词: Nitrates
; Photochemical reactions
; Sulfur compounds
; Troposphere
; Biomass burning emissions
; Dichlorofluorescein
; Fluorescent products
; Natural water samples
; Natural waters
; Rainwater
; Southern Hemisphere
; Sulfate
; Vehicles
; hydrogen peroxide
; rain
; sea water
; surface water
; burning
; concentration (composition)
; emission control
; fluorometry
; hydrogen peroxide
; nitrate
; rainwater
; reaction kinetics
; solar radiation
; Southern Hemisphere
; sulfate
; traffic emission
; Article
; autooxidation
; Brazil
; city
; comparative study
; enzyme activity
; exhaust gas
; fluorescence
; fluorometry
; ion chromatography
; pH
; pH measurement
; priority journal
; solar radiation
; spectrophotometry
; troposphere
; water sampling
; Brazil
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This work investigates the effect of public policies related to vehicle emissions on the lower tropospheric concentrations of H2O2 in a typical midsized city in tropical Brazil. The concentrations of H2O2, SO4 2−, and NO3 − in rainwater samples were determined from 2014 to 2017 in the municipality of Ribeirão Preto in São Paulo State. A fluorometric method, based on the formation of a highly fluorescent product (2′,7′-dichlorofluorescein, DCF), was adapted and optimized for the measurement of H2O2 in natural water samples including seawater. The method was highly specific, accurate and sensitive (LOD = 2 nmol L−1). Its main advantage compared to others, was that the fluorophore remained stable for at least 48 h, offering a longer time interval in which to perform the analysis and therefore facilitating fieldwork. Concentrations of H2O2 in rainwater ranged from 5.8 to 96 μmol L−1, with VWM of 28.6 ± 1.4 μmol L−1 (n = 77). Solar radiation appeared to have a greater impact on production than on consumption of H2O2. The annual VWM concentrations of H2O2 in rainwater were negatively correlated with sulfate (at pH < 5) and nitrate, suggesting that national policies designed to reduce vehicle emissions of SO2 and NOx resulted in increased atmospheric H2O2 concentrations, impacting the oxidative capacity of the lower troposphere. Biomass burning emissions and photochemical reactions were also found to be important factors affecting the concentration of H2O2 in the atmosphere. This work expands the current records available for the Southern Hemisphere, where there is a considerable paucity of information regarding temporal production and loss of atmospheric H2O2. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83045
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Chemistry, University of São Paulo, Ribeirão Preto, SP, Brazil
Recommended Citation:
Scaramboni C,, Crispim C,P,et al. Investigating hydrogen peroxide in rainwater of a typical midsized city in tropical Brazil using a novel application of a fluorometric method[J]. Atmospheric Environment,2018-01-01,176