The significance of atmospheric inputs of soluble and particulate major and trace metals to the eastern Mediterranean seawater

Theodosi, C.; Markaki, Z.; Τσελεπίδης, Α.; Mihalopoulos, N.

doi:10.1016/j.marchem.2010.02.003

Cited by 66 publications

(44 citation statements)

References 43 publications

(60 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After cooling to room temperature, the digested solution was transferred to an acid-cleaned polyethylene container and stored in the freezer. The solutions thus obtained were finally analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS, Thermo Electron X Series), following the technique described in detail by Theodosi et al (2010c). Recoveries obtained for certified reference materials (MESS-3, GBW 07313 and BCSS-1) were excellent, ranging from 90.0-104.1 % for all studied elements except Al (60 %) which was corrected accordingly.…”

Section: Discussionmentioning

confidence: 99%

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

et al. 2013

Self Cite

View full text Add to dashboard Cite

To assess sources and major processes controlling the vertical transport of both anthropogenic and natural chemical species in a deep basin of the Eastern Mediterranean Sea (SE Ionian Sea, Nestor site), we performed chemical characterization (elemental carbon, major and trace metals and polycyclic aromatic hydrocarbons) of marine sinking particles. Sediment traps were deployed at five successive depths, 700, 1200, 2000, 3200 and 4300 m from the sea surface from May 2007 to October 2008. Fluxes of all measured chemical species, attributed to both natural and anthropogenic sources, exhibited minimum values from January to March 2008 and maximum from April to September 2008. Crustal matter flux from atmospheric inputs – either "freshly" deposited or stored in the surface layers – plays an important role in the temporal variability of particulate marine matter fluxes along with particulate organic carbon export, imposing ballast effects. Tracers (elemental carbon, retene) of the devastating forest fires that occurred in August 2007 in southern Greece were detected in sediment trap material from all depths with a delay of 15 days at 4300 m, indicating a rapid and well-coupled transport of sinking particulate material between the sea-surface and deep layers of the Eastern Mediterranean Sea. This is in accordance with an evident covariance between certain compounds, suggesting common sources and/or transport mechanisms to depth. Lateral inputs of pollutants at the deepest trap (4300 m) are probably of importance, related to the periodic influence of deep Adriatic water at the study site

show abstract

Section: Discussionmentioning

confidence: 99%

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Trace elements and metals were determined using an inductively coupled plasma mass spectrometry (Thermo Electron X Series) after the acid microwave digestion of samples (a filter disc of 1.8 cm in diameter) as reported by Theodosi et al (2010b …”

Section: Determination Of Trace Elements Metals and Water-soluble Irmentioning

confidence: 99%

Laboratory photochemical processing of aqueous aerosols: formation and degradation of dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls

et al. 2015

Self Cite

View full text Add to dashboard Cite

Abstract. To better understand the photochemical processing of dicarboxylic acids and related polar compounds, we conducted batch UV irradiation experiments on two types of aerosol samples collected from India, which represent anthropogenic (AA) and biogenic (BA) aerosols, for time periods of 0.5 to 120 h. The irradiated samples were analyzed for molecular compositions of diacids, oxoacids and α-dicarbonyls. The results show that photochemical degradation of oxalic (C 2 ), malonic (C 3 ) and other C 8 -C 12 diacids overwhelmed their production in aqueous aerosols, whereas succinic acid (C 4 ) and C 5 -C 7 diacids showed a significant increase (ca. 10 times) during the course of irradiation experiments. The photochemical formation of oxoacids and α-dicarbonyls overwhelmed their degradation during the early stages of experiment except for ω-oxooctanoic acid (ωC 8 ), which showed a similar pattern to that of C 4 . We also found a gradual decrease in the relative abundance of C 2 to total diacids and an increase in the relative abundance of C 4 during prolonged experiment. Based on the changes in concentrations and mass ratios of selected species with the irradiation time, we hypothesize that iron-catalyzed photolysis of C 2 and C 3 diacids controls their concentrations in Fe-rich atmospheric waters, whereas photochemical formation of C 4 diacid (via ωC 8 ) is enhanced with photochemical processing of aqueous aerosols in the atmosphere. This study demonstrates that the ambient aerosols contain abundant precursors that produce diacids, oxoacids and α-dicarbonyls, although some species such as oxalic acid decompose extensively during an early stage of photochemical processing.

show abstract

“…More details on the IC method are given by Bardouki et al (2003). An acid microwave digestion procedure followed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS, Thermo Electron X Series) was applied to measure PM elemental concentrations (V, Cr, Mn, Fe, Ni, Cu, Cd and Pb) (Theodosi et al, 2010b).…”

Section: Sampling and Analytical Techniquesmentioning

confidence: 99%

Mass and chemical composition of size-segregated aerosols (PM1, PM2.5, PM10) over Athens, Greece: local versus regional sources

et al. 2011

Self Cite

View full text Add to dashboard Cite

Abstract.To identify the relative contribution of local versus regional sources of particulate matter (PM) in the Greater Athens Area (GAA), simultaneous 24-h mass and chemical composition measurements of size segregated particulate matter (PM 1 , PM 2.5 and PM 10 ) were carried out from September 2005 to August 2006 at three locations: one urban (Goudi, Central Athens, "GOU"), one suburban (Lykovrissi, Athens, "LYK") in the GAA and one at a regional background site (Finokalia, Crete, "FKL").The two stations in the GAA exceeded the EU-legislated PM 10 limit values, both in terms of annual average (59.0 and 53.6 µg m −3 for Lykovrissi and Goudi, respectively) and of 24-h value. High levels of PM 2.5 and PM 1 were also found at both locations (23.5 and 18.6 for Lykovrissi, while 29.4 and 20.2 µg m −3 for Goudi, respectively).Significant correlations were observed between the same PM fractions at both GAA sites indicating important spatial homogeneity within GAA. During the warm season (April to September), the PM 1 ratio between GAA and FKL ranged from 1.1 to 1.3. On the other hand this ratio was significantly higher (1.6-1.7) during the cold season (October to March) highlighting the role of long-range transport and local sources during the warm and cold seasons respectively. Regarding the coarse fraction no seasonal trend was observed for both GAA sites with their ratio (GAA site/FKL) being higher than 2 indicating significant contribution from local sources such as soil and/or road dust.Chemical speciation data showed that on a yearly basis, ionic and crustal mass represent up to 67-70 % of the gravimetrically determined mass for PM 10 samples in the GAA Correspondence to: N. Mihalopoulos (mihalo@chemistry.uoc.gr) and 67 % for PM 1 samples in LYK. The unidentified mass might be attributed to organic matter (OM) and elemental carbon (EC), in agreement with the results reported by earlier studies in central Athens. At all sites, similar seasonal patterns were observed for nss-SO 2− 4 , a secondary compound, indicating significant contribution from regional sources in agreement with PM 1 observations. The contribution of local sources at both GAA sites was also estimated by considering mass and chemical composition measurements at Finokalia as representative of the regional background. Particulate Organic Matter (POM) and EC, seemed to be the main contributor of the local PM mass within the GAA (up to 62 % in PM 1 ). Dust from local sources contributed also significantly to the local PM 10 mass (up to 33 %).

show abstract

The significance of atmospheric inputs of soluble and particulate major and trace metals to the eastern Mediterranean seawater

Cited by 66 publications

References 43 publications

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

Laboratory photochemical processing of aqueous aerosols: formation and degradation of dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls

Mass and chemical composition of size-segregated aerosols (PM<sub>1</sub>, PM<sub>2.5</sub>, PM<sub>10</sub>) over Athens, Greece: local versus regional sources

Contact Info

Product

Resources

About

The significance of atmospheric inputs of soluble and particulate major and trace metals to the eastern Mediterranean seawater

Cited by 66 publications

References 43 publications

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

Laboratory photochemical processing of aqueous aerosols: formation and degradation of dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls

Mass and chemical composition of size-segregated aerosols (PM&lt;sub&gt;1&lt;/sub&gt;, PM&lt;sub&gt;2.5&lt;/sub&gt;, PM&lt;sub&gt;10&lt;/sub&gt;) over Athens, Greece: local versus regional sources

Contact Info

Product

Resources

About

Mass and chemical composition of size-segregated aerosols (PM<sub>1</sub>, PM<sub>2.5</sub>, PM<sub>10</sub>) over Athens, Greece: local versus regional sources