Rainwater in Guangzhou, China: Oxidizing properties and physicochemical characteristics

Objective & Hypothesis:This study analyzed urban wet deposition data collected during 81 rain events from October 2016 to September 2017 in Guangzhou, China.

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Key Findings & Data:The oxidizing properties (H2O2 and ClO −), anions and cations (F−, Cl−, Br−,NO2 , NO3 , SO4 , PO4 , Li , Na , NH3 , K , Mg , and Ca2+), rainwater quality indicators (pH, re- duction potential (Eh), and electrical conductivity (EC)), and meteorological factors (precipitation, solar ra- diation intensity, relative humidity, and temperature) during wet deposition were measured and examined.

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Conclusion & Impact:No correlation between the H2O2 concentration and temperature was evident.

🔬Design:Research Article

📍Scope:2016 Verileri

⚙️Variables:Domain Parameters

Özet

This study analyzed urban wet deposition data collected during 81 rain events from October 2016 to September 2017 in Guangzhou, China. The oxidizing properties (H2O2 and ClO −), anions and cations (F−, Cl−, Br−,NO2 , NO3 , SO4 , PO4 , Li , Na , NH3 , K , Mg , and Ca2+), rainwater quality indicators (pH, re- duction potential (Eh), and electrical conductivity (EC)), and meteorological factors (precipitation, solar ra- diation intensity, relative humidity, and temperature) during wet deposition were measured and examined. The maximum concentration of H2O2 in rainwater was 118.7 μM, with an annual average of 20.1 μM. The seasonal changes in the average concentration of H2O2 followed the order spring (27.8 μM) > summer (18.4 μM) > winter (16.4 μM) > autumn (13.2 μM). The highest and lowest average H2O2 concentrations were recorded during spring and autumn, respectively. The ClO4− concentration ranged from 0.4 ppb to 110.3 ppb (average: 13.9 ppb). The highest ClO4− concentration was recorded in winter and was attributed to fireworks and firecrackers. The rainwater pH was weakly acidic (average pH: 6.3). The Eh ranged from 225.6 mV to633.0 mV (annual average: 395.8 mV). There were significant differences in the EC of wet deposition, which ranged from 8.8 μS/cm to 534.0 μS/cm. Strong determination correlations between EC and ion concentrations were observed, and significant changes in the EC of rainwater were related to differences in the total amount of ions in the rainwater. H2O2 concentration exhibited a weak positive correlation with relative humidity. No correlation between the H2O2 concentration and temperature was evident.

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Cite This Article

LİN, X., HE, L., ZHANG, R., GUO, X., Lİ, H. (2019). Rainwater in Guangzhou, China: Oxidizing properties and physicochemical characteristics. Atmospheric Pollution Research, Cilt: 10 - Sayı: 1, 303–312. https://ajindex.com/articles/351303

References (6)

Balasubramanian, R., Victor, T., Chun, N., 2001. Chemical and statistical analysis of precipitation in Singapore. Water Air Soil Pollut. 130 (1–42), 451–456.
Barron, L., Nesterenko, P.N., Paull, B., 2006. Rapid on-line preconcentration and sup-pressed micro-bore ion chromatography of part per trillion levels of perchlorate in rainwater samples. Anal. Chim. Acta 567 (1), 127–134. Becker,K.H.,Bechara,J.,Brockmann,K.J.,1993.StudiesontheformationofH2O2intheozonolysis of alkenes. Atmos. Environ. Part A. General Topics 27 (1),57–61.
Bohlke, J.K., et al., 2009. Atacama perchlorate as an agricultural contaminant ingroundwater: isotopic and chronologic evidence from longisland, New York.Environ. Sci. Technol. 43 (15), 5619–5625.
Chapman-Novakofski, K., 2008. Nutrition and Health in Developing Countries.Chen, X., Aoki, M., Zhang, S., et al., 2008. Observation of hydrogen peroxide con-centrations in a Japanese red pine forest. J. Atmos. Chem. 60 (1), 37–49.
Claiborn, C., Aneja, V.P., 1991. Measurements of atmospheric hydrogen peroxide in thegas phase and in cloud water at Mt. Mitchell, North Carolina. 96, 18771–18787. DasGupta,P.K.,etal.,2006.PerchlorateintheUnitedStates.Analysisofrelativesourcecontributions to the food chain. Environ. Sci. Technol. 40 (21), 6608–6614. Drábková, M., Admiraal, W., Marsálek, B., 2007. Combined exposure to hydrogen peroxideandlightselectiv eeffects on cyanobacteria,greenalgae,anddiatoms.Environ.Sci. Technol. 41 (1), 309–314. Dumka,U.C.,2016.Natureandsourcesofionicspeciesinprecipitation acrosstheIndo-Gangetic plains, India. Aerosol Air Qual. Res. 16 (4), 943–957. Fornaro,A.,etal.,Gonçalves,C.,Santos,M.A.,Fornaro,A.,Pedrotti,J.J.,2010.Hydrogenperoxide in the rainwater of São Paulo Megacity - measurements andcontrollingfactors. J. Braz. Chem. Soc. 21, 331–339. Gunz,D.W.,Hoffmann,M.R.,1990.Fieldinvestigationsonthesnowchemistryincentraland southern California—I. Inorganic ions and hydrogen peroxide. Atmos. Environ.Part A. General Topics 24 (7), 1661–1671.
He, S.Z., Chen, Z.M., Zhang, X., et al., 2010. Measurement of atmospheric hydrogenperoxide andorganic peroxides in Beijing before and during the 2008 OlympicGames: chemical and physical factors influencing their concentrations. J. Geophys.Res. Atmos. 115 (D17).Hua,W.,etal.,2008.Atmospheric hydrogen peroxide and organic hydroperoxides during PRIDE PRD'06,China:theirconcentration,formationmechanismandcontributiontosecondary aerosols. 8.Huang, S., Fuse, Y., Yamada, E., 2004. Measurement and be