The formation and growth of calcium sulfate crystals through oxidation of SO₂ by O₃ on size-resolved calcium carbonate.

ABSTRACT: Calcium sulfate is a major constituent of atmospheric sulfate, with a typical rod-like morphology ranging from several hundred nanometers to approximately two micrometers observed in field studies. However, the chemical formation mechanism is still not well known. In this study, the kinetics and mechanism for the formation and growth of rod-like calcium sulfate crystals through oxidation of SO₂ by O₃ on size-resolved CaCO₃ at different relative humidity (RH) were investigated using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and scanning electron microscopy (SEM). We found that the concentration and formation rate of sulfate decreased with the increasing diameter of CaCO₃ particles, and thus smaller particles could enhanc

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC9080251 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature