This study presents the changes in dissolved sulfate concentration and isotope composition of Icelandic river waters between the peak of SO2 emissions in the United States and Europe and the present. Chloride concentration in Icelandic rivers has not changed much since 1972. The overall average change from 1972-1973 to 1996-2004 was -3%, indicating insignificant sea-salt contribution changes. M...

The goal of this work is to investigate the effectiveness amorphous SiO2−FexOy loaded by functionalization with Ce(SO4)2, Li2SO4, and 3-aminopropyltriethoxysilane (APTES) for CO2 adsorption. Silica iron-based materials are gaining popularity due their wide range applications, such as catalysis, photocatalysis, imaging, etc.; however, there very few studies regarding adsorption aforementioned ma...

Efficient microalgae harvesting is a great challenge hindering diverse industrial applications of microalgae. Flocculation regarded as an effective and promising technology for harvesting. In this study, sulfate (Al2(SO4)3 Fe2(SO4)3) chloride flocculants (AlCl3 FeCl3) were used to harvest Chlorella vulgaris. conditions, including flocculant dose, flocculation time, stirring speed, pH, optimized...

In recent years, advanced oxidation process (AOPs) based on sulfate radical (SO4??) and singlet oxygen (1O2) has attracted a lot of attention because its characteristics rapid reaction, efficient treatment, safety stability, easy operation. SO4?? 1O2 mainly comes from the activation reaction peroxymonosulfate (PMS) or persulfate (PS), which represent reactions involving radicals non-radicals, r...

Sulfur participates in many important mechanisms and pathways of plant development. The most common source of sulfur in soil -SO4(2-)- is absorbed into root tissue and distributed into aerial part through vasculature system, where it is reduced into sulfite and finally sulfide within the subcellular organs such as chloroplasts and mitochondria and used for cysteine and methionine biosynthesis. ...

Introduction: Sulfates have been identified on Mars by orbital remote sensing (OMEGA and CRISM) and during surface exploration (Viking, MER) [1-4]. MER rovers have found Fe-sulfates at both landing sites. A ferric sulfate (jarosite) was identified with the Mössbauer spectrometer (MB) in Meridiani Planum outcrops (~10 wt.%) [5]. At Gusev Crater, light-toned salty soils are hydrous as seen by Min...

Observations of the mass and chemical composition of particles less than 2.5 microm in aerodynamic diameter (PM2.5), light extinction, and meteorology in the urban Baltimore-Washington corridor during July 1999 and July 2000 are presented and analyzed to study summertime haze formation in the mid-Atlantic region. The mass fraction of ammoniated sulfate (SO4(2-)) and carbonaceous material in PM2...

We use the fractional aerosol optical depth (AOD) values derived from Multiangle Imaging Spectroradiometer (MISR) aerosol component measurements, along with aerosol transport model constraints, to estimate ground-level concentrations of fine particulate matter (PM2.5) mass and its major constituents in the continental United States. Regression models using fractional AODs predict PM2.5 mass and...