Characterization of atmospheric surfactants in the bulk precipitation by electrochemical tools

Orlović-Leko, Palma; Kozarac, Zlatica; Ćosović, Božena; Strmečki, Slađana; Plavšić, Marta

doi:10.1007/s10874-011-9189-y

Cited by 12 publications

(10 citation statements)

References 45 publications

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“…For example Wang et al [67] observed that concentrations of hydrophobic VOCs in cloud water can be supersaturated by a factor of 10-10 3 in comparison with Henry's law of equilibrium. Therefore, the relatively high surface-active properties of present organic matter in atmospheric precipitation are probably a consequence of the higher concentration of hydrophobic organic contaminants in rain droplets as has been shown in our earlier studies [23,65].…”

Section: Aquatic System (Croatia) Sas Referencessupporting

confidence: 55%

“…These compounds are the most reactive part of DOC [25] because they tend to adsorb on the natural phase boundaries (air-water, water-sediment/suspended particles) and, in this way, significantly affect the transfer of mass and energy. In our previous work, we have shown that some metal ions can accumulate in adsorbed layers of organic molecules [23]. This mechanism could be important for the geochemical cycle of metals.Film-forming compounds can influence the microphysical processes of humid aerosol particles and atmospheric droplets [24,26].…”

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confidence: 89%

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Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

et al. 2020

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The characterization of organic matter (OM) and trace elements (TEs) was conducted in bulk precipitation samples collected in an urban area of Croatia (Zagreb center), from January 2009 to October 2011 (N = 31). Characterization of OM was performed by measurement of dissolved (DOC) and particulate forms of organic carbon (POC), as well as surface-active substances, copper complexing capacity and reduced sulfur species which were determined electrochemically. Concentrations of TEs (Al, Fe, Zn, Cr, Ba, Mn, Cu, Sr, Ti, Pb, V, Ni, Rb, Sb, As, Sn, Se, Co, Cd, Mo) were analyzed by HR ICP-MS. The most important outcome of this study is confirmed relatively low concentrations of DOC (0.69–4.86 mgC L−1) and TEs. Daily fluxes of Zn, Pb, Ni, As, and Cd were two to three times lower than that of those reported for an urban industrial site in Europe. Additionally, this study shows that the value and reactivity of rainwater DOC has not considerably changed if compared with the results from the 1998–1999 study (0.78–4.39 mgC L−1). High traffic density and thermal power plants are assumed to be the main local sources of pollutants in Zagreb. Using Al as a reference element, it was found that Cd, Sb, and Cu were associated with anthropogenic sources. The solubility of Sr, Zn, Cd, Ni, Cr, As, and Rb was higher than 70%. Another critical characteristic of precipitation composition is episodic variation in POC concentration because of Saharan dust transport. Obtained data can be valuable for environmental quality assessment, as well as for insight into atmospheric deposition processes.

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Section: Aquatic System (Croatia) Sas Referencessupporting

confidence: 55%

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confidence: 89%

Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

et al. 2020

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“…An electrochemical technique, initially developed for seawater and larger aqueous samples, has also been used to measure the concentration of surfactants in atmospheric aerosols. 31 32 This method is relative, i.e. the surfactant concentrations obtained depend on the reference compounds chosen and assume that the detection sensitivity of all surfactants is identical.…”

Section: Discussionmentioning

confidence: 99%

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Nozière¹,

Gerard²,

Baduel³

et al. 2017

JoVE

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Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in the Earth's atmosphere, a central process in meteorology, hydrology, and for the climate system. But because specific extraction and characterization of these compounds have been lacking for decades, very little is known on their identity, properties, mode of action and origins, thus preventing the full understanding of cloud formation and its potential links with the Earth's ecosystems.In this paper we present recently developed methods for 1) the targeted extraction of all the surfactants from atmospheric aerosol samples and for the determination of 2) their absolute concentrations in the aerosol phase and 3) their static surface tension curves in water, including their Critical Micelle Concentration (CMC). These methods have been validated with 9 references surfactants, including anionic, cationic and non-ionic ones. Examples of results are presented for surfactants found in fine aerosol particles (diameter <1 μm) collected at a coastal site in Croatia and suggestions for future improvements and other characterizations than those presented are discussed.

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“…This is mainly due to the sensitivity limitations of classical methods used for low-level SAS quantification in atmospheric samples. Notwithstanding, the herein-applied electrochemical method (phase sensitive alternating current (AC) voltammetry; out of phase mode) has been proven to be sensitive and directly applicable for the qualitative and quantitative characterization of SAS in various natural aqueous systems, e.g., refs − , including bulk precipitation , and aqueous aerosol extracts, serving as a platform for low-level SAS determination in aqueous extracts of size-segregated aerosols.…”

Section: Introductionmentioning

confidence: 99%

Size-Resolved Surface-Active Substances of Atmospheric Aerosol: Reconsideration of the Impact on Cloud Droplet Formation

Kroflič

Frka

Simmel

et al. 2018

Environ. Sci. Technol.

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Our current understanding of the importance of surface-active substances (SAS) on atmospheric aerosol cloud-forming efficiency is limited, as explicit data on the content of size-resolved ambient aerosol SAS, which are responsible for lowering the surface tension (σ) of activating droplets, are not available. We report on the first data comprising seasonal variability of size-segregated SAS concentrations in ambient aerosol particulate matter (PM). To assess the impact of SAS distribution within PM on cloud droplet activation and growth, a concept of surfactant activity was adopted and a parametrization developed; i.e., surfactant activity factor (SAF) was defined, which allowed translation of experimental data for use in cloud parcel modeling. The results show that SAS-induced σ depression during cloud activation may affect droplet number ( N) as much as a 2-fold increase in particle number, whereas by considering also the size distribution of particulate SAS, N may increase for another 10%. This study underscores the importance of size-resolved SAS perspective on cloud activation, as data typically obtained from aqueous extracts of PM and PM may result in misleading conclusions about droplet growth due to large mass fractions of supermicron particles with SAS deficit and little or no influence on CCN and N.

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Characterization of atmospheric surfactants in the bulk precipitation by electrochemical tools

Cited by 12 publications

References 45 publications

Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Size-Resolved Surface-Active Substances of Atmospheric Aerosol: Reconsideration of the Impact on Cloud Droplet Formation

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