The temperature-dependent phase diagrams, from 40 to -50 °C, of the binary (NH4)2SO4/H2O system are derived from data collected in a low-temperature, single-levitated-particle apparatus. The conditions of vapor pressure, temperature, and composition, at which particle phase transitions occur along the path of increasing relative humidity, define the equilibrium phase diagram, whereas the set of...

Sulfur and oxygen isotopes were employed to identify SO42- sources in surface water and groundwater in the Babu subterranean river basin (BSRB). Our study revealed SO42- enrichment in the BSRB waters compared with adjacent areas. The SO42- in some samples originated mainly from precipitation; in others, it was derived mainly from sulfide dissolution in coal seams or from gypsum dissolution. In ...

Abstract. Daily air concentrations of inorganic nitrogen (N) species, including gaseous HNO3 and particulate-bound (p)NH4+ pNO3-, sulfur (S) SO2 pSO42-, precipitation NO3-, NH4+, SO42-, have been routinely monitored by the Canadian Air Precipitation Monitoring Network (CAPMoN) since 1983. Data at 15 rural sites from 2000–2018 were used to estimate dry wet N S deposition fluxes, which then explo...

1. Electrophysiological techniques have been applied to tsetse fly Malpighian tubules for the first time. 2. In either Cl- or SO42- Ringer, both non-perfused and perfused tubules displayed transtubular potentials (Vt) at or close to 0 mV. Exposure to cyclic AMP elicited a marked secretory response and, in SO42- Ringer, a sharp (lumen-positive) increase in Vt. In Cl- Ringer, despite more than do...

BACKGROUND The finding reported in a previous paper - alkalization of urine facilitates uric acid excretion - is contradictory to what one might expect to occur: because food materials for the alkalization of urine contain fewer purine bodies than those for acidification, less uric acid in alkaline urine should have been excreted than in acid urine. To make clear what component of uric acid exc...

Precipitation samples were collected over Arabian Sea during Monsoon Experiment (ARMEX) campaign for the period June- August 2002 onboard Ocean Research vessel Sagar Kanya. All rain water analysed pH and major soluble ionic components. The of was alkaline order chemical composition is followed as Cl- > Na+ Ca2+ SO42- Mg2+ K+ NO3- NH4+. salt components dominant (~ 90%) in precipitation. Signi...

The leachates generated at Hong Kong landfill sites contain high strength of ammonium-nitrogen (NH4+-N) over 3,000 mg l(-1) and are generally inhibitive to most biological treatment processes. To remove the NH4+-N from the landfill leachates and also recover the nitrogen as a struvite fertilizer, a lab-scale study was performed to investigate the feasibility of NH4+-N removal and struvite cryst...

The thermophilic, gram-positive bacterium Thermoterrabacterium ferrireducens coupled organotrophic growth to the reduction of sparingly soluble U(VI) phosphate. X-ray powder diffraction and X-ray absorption spectroscopy analysis identified the electron acceptor in a defined medium as U(VI) phosphate [uramphite; (NH4)(UO2)(PO4) . 3H2O], while the U(IV)-containing precipitate formed during bacter...

ISORROPIA II: a computationally efficient thermodynamic equilibrium model for KCa–Mg–NH4–Na –SO 4 –NO − 3–Cl –H2O aerosols C. Fountoukis and A. Nenes School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0100, USA School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0100, USA ...