Particle-particle chemistry between micrometer-sized PbSO<sub>4</sub> and CaCO<sub>3</sub> particles in turbulent flow initiated by liquid water - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry A Année : 2012

Particle-particle chemistry between micrometer-sized PbSO4 and CaCO3 particles in turbulent flow initiated by liquid water

Résumé

A mixture of natural and anthropogenic particles is ubiquitous in the troposphere and exerts an important influence on air quality. This work reports the study of mixing and heterogeneous chemistry of particles of natural-like mineral dust (CaCO3) and anthropogenic-like microparticle (PbSO4) in turbulent air flow under varying relative humidity. Sparse monolayers of laboratory-generated particles were collected on substrates using impaction. The grain size distribution and chemistry of micrometer-sized particles were determined as CaCO3-PbSO4 internal and external mixtures by Raman imaging, scanning electron microscopy, and time-of-flight static secondary ionization mass spectrometry. The condensation of a thin water layer on mixed aggregates initiates the formation of complex internal mixtures of Pb3(CO3)2(OH)2, PbCO3, CaSO4*2H2O, CaCO3, and PbSO4 fine particles. These heterogeneous chemistry processes which may occur in ambient air can increase dramatically the amounts of hazardous breathable particles.
Fichier non déposé

Dates et versions

hal-00725290 , version 1 (24-08-2012)

Identifiants

Citer

G. Falgayrac, S. Sobanska, C. Brémard. Particle-particle chemistry between micrometer-sized PbSO4 and CaCO3 particles in turbulent flow initiated by liquid water. Journal of Physical Chemistry A, 2012, 116, pp.7386 - 7396. ⟨10.1021/jp302874j⟩. ⟨hal-00725290⟩
50 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More