The System NH4-H-SO3NH2-SO4-H2O at 25°C

Crystal structure of NH4[La(SO4)2(H2O)]

The principal building units in the crystal structure of ammonium aqua-bis(sulfato)-lanthanate(III) are slightly distorted SO4 tetra-hedra, LaO9 polyhedra in the form of distorted tricapped trigonal prisms, and NH4 (+) ions. The La(3+) cation is coordinated by eight O atoms from six different sulfate tetra-hedra, two of which are bidentate coordinating and four monodentate, as well as one O ato...

THERMODYNAMIC MODELING IN THE Na-NO3-SO4-Cl-OH-H2O CHEMICAL SYSTEM AT 25 °C

Inhibition of solute crystallisation in aqueous H(+)-NH(4)(+)-SO4(2-)-H2O droplets.

Ice clouds in the Earth's upper troposphere can form via homogeneous nucleation of ice in aqueous droplets. In this study we investigate the crystallisation, or lack of crystallisation, of the solute phase and ice in aqueous (NH(4))(3)H(SO(4))(2)/H(2)O and NH(4)HSO(4)/H(2)O droplets. This is done using in situ X-ray diffraction of emulsified solution droplets mounted on a cold stage. From the d...

Vibrational spectroscopic characterization of the sulphate mineral khademite Al(SO4)F·5(H2O).

Vibrational spectroscopy has been used to characterize the sulphate mineral khademite Al(SO4)F·5(H2O). Raman band at 991 cm-1 with a shoulder at 975 cm-1 is assigned to the ν1 (SO4)2- symmetric stretching mode. The observation of two symmetric stretching modes suggests that the sulphate units are not equivalent. Two low intensity Raman bands at 1104 and 1132 cm-1 are assigned to the ν3 (SO4)2- ...

Indoor, outdoor, and regional summer and winter concentrations of PM10, PM2.5, SO4(2)-, H+, NH4+, NO3-, NH3, and nitrous acid in homes with and without kerosene space heaters.

Twenty-four-hour samples of PM10 (mass of particles with aerodynamic diameter < or = 10 microm), PM2.5, (mass of particles with aerodynamic diameter < or = 2.5 microm), particle strong acidity (H+), sulfate (SO42-), nitrate (NO3-), ammonia (NH3), nitrous acid (HONO), and sulfur dioxide were collected inside and outside of 281 homes during winter and summer periods. Measurements were also conduc...