16 17 This study characterizes the spatial and temporal patterns of aerosol and precipitation 18 composition at six sites across the United States Southwest between 1995 and 2010. Precipitation 19 accumulation occurs mostly during the wintertime (December February) and during the 20 monsoon season (July September). Rain and snow pH levels are usually between 5 – 6, with 21 crustal-derived speci...

Wet deposition of solutes to an alpine catchment in the southern Sierra Nevada was measured from October 1984 through March 1988. Rainfall had a volume-weighted pH of 4.9, and snowfall had a volume-weighted pH of 5.3. Acetic and formic acids were important components of all wet deposition, contributing 25-30% of the measured anions in snowfall and, through analysis of charge balance deficits, t...

Nanoparticles of palladium-doped cerium oxide (Pd–CeO2) have been prepared by aqueous co-precipitation resulting in a single phase cubic structure after calcination according to X-ray diffraction (XRD). Inhomogeneous strain, calculated using the Williamson–Hall method, was found to increase with palladium content, and the lattice contracts slightly, relative to nano-cerium oxide, as palladium c...

In the Retezat Mountains concentrations of O3, NO2 and SO2 in summer season 2000-2002 were low and below toxicity levels for forest trees. While NH3 concentrations were low in 2000, the 2001 and 2002 concentrations were elevated indicating possibility for increased N deposition to forest stands. More than 90% of the rain events were acidic with pH values <5.5, contributing to increased acidity ...

Ž . At two caves Clamouse, S France and Ernesto, NE Italy , cave drip and pool waters were collected and sampled at intervals over a 2–3 year period. MgrCa and SrrCa concentration ratios, corrected for marine aerosols, are compared with those of bedrocks and, in some cases, aqueous leachates of soils and weathered bedrocks. Cave waters do not lie along mixing lines between calcite and dolomite ...

Epilithic and endolithic biofilms were found to control the formation of stromatolites in karst-water creeks. We used microsensors to determine the influence of biological processes on chemical conditions within the microenvironment of crystal nucleation sites: the stromatolite surface. Phototrophic members of the biofilms consisted of mainly cyanobacteria and diatoms. Oxygen, pH, calcium, and ...

A long-term (2–3 years) measurement of aerosol and precipitation chemistry was carried out in a remote site in Central Amazonia, Balbina, (1 • 55 ′ S, 59 • 29 ′ W, 174 m above sea level), about 200 km north of Manaus city. Aerosols were sampled using stacked filter units (SFU), which separate fine (d<2.5 µm) and coarse mode 5 (2.5 µm<d<10.0 µm). Filters were analyzed for particulate mass (PM), ...

1 Departament d’ enginyeria química, Universitat Rovira i Virgili, Av. dels Països Catalans 26, 43007 6 Tarragona, Spain; A. Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznan, 7 Poland [email protected] 8 2 Departament d’ enginyeria química, Universitat Rovira i Virgili, Av. dels Països Catalans 26, 43007 9 Tarragona, Spain; A. Mickiewicz University, Faculty of Ch...