Reactivity of organic sulfur compounds deposited on the surface of sea salts: Influence of humidity and UV-Vis light

LUCIANA C. JUNCAL; A. LORENA PICONE; SAMANTHA SENG; MYRIAM MOREAU; ISABELLE DE WAELE; ROSANA M. ROMANO; YENY A. TOBÓN; SOPHIE SOBANSKA

Milán

Conferencia; European Aerosol Conference 2015; 2015

European Aerosol Conference

In this study, laboratory experiments were conducted to simulate heterogeneous reaction at the surface of sea salt particle (NaCl) coated with Methylthioglycolate (MTG) and exposed to humidity and UVVis light. We have used MTG (CH3OC(O)CH2SH) as a model of low volatile sulfur compound of industrial or biological origin. Observation of processes occurring on NaCl surfaces was performed by µ-Raman spectroscopy, µ-FT-IR, Atomic Force Microscopy (AFM), and timeof-flight secondary ion mass spectrometry (ToF-SIMS). The combined use of these techniques is a powerful tool to determine the morphology and the distribution of molecular species, as well as the first layers (few nm) at the surface of particles