Natural organic matter in urban aerosols: Comparison between water and alkaline soluble components using excitation-emission matrix fluorescence spectroscopy and multiway data analysis

resumo

Understanding the complexity of Natural Organic Matter (NOM) in atmospheric aerosols has remained an important goal for the atmospheric research community. This work employs a Parallel Factor Model (PARAFAC) with Alternating Least Squares (ALS) algorithm to decompose and further compare sets of excitation-emission matrices fluorescence spectra of Water-soluble and Alkaline-soluble Organic Matter (WSOM and ASOM, respectively), sequentially extracted from urban aerosols collected during different seasons. The PARAFAC-ALS modelling identified three components in both WSOM and ASOM, whose maximum intensities follow a clear seasonal trend and which are likely to represent the dominant fluorescent moieties in NOM from urban aerosols. The PARAFAC-ALS modelling also indicated differences between the colder and warmer seasons in the fluorescence map of one WSOM component, which contrast with the results obtained for the ASOM, where the fluorescence signatures were found to be constant along the seasons, suggesting that the ASOM may have an in situ origin. (C) 2014 Elsevier Ltd. All rights reserved.

palavras-chave

MAGNETIC-RESONANCE-SPECTROSCOPY; RESOLUTION MASS-SPECTROMETRY; HUMIC-LIKE SUBSTANCES; ATMOSPHERIC AEROSOLS; FINE AEROSOL; AQUATIC ENVIRONMENTS; PARAFAC; CARBON; VARIABILITY; FEATURES

categoria

Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences

autores

Matos, JTV; Freire, SMSC; Duarte, RMBO; Duarte, AC

nossos autores

Grupos

agradecimentos

This work was supported by the Centre for Environmental and Marine Studies (PEsT-c/MAR/LA0017/2013, University of Aveiro, Portugal) and the Portuguese Science and Technology Foundation (FCT), through the European Social Fund (ESF) and

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".