Metallic nanoparticle enrichment at low temperature, shallow CO2 seeps in Southern Italy

Francesco Parello, Roy M. Harrison, Enikö Kadar, Andrew Fisher, Jamie Lead, Björn Stolpe

Risultato della ricerca: Article

14 Citazioni (Scopus)

Abstract

We report on metal enrichment along a natural pH gradient owing to increased CO2 degassing at cold, shallow seeps of Vulcano Island in the Mediterranean Sea, off Sicily. We assessed composition of unfiltered and filtered seawater (<100 nm) along acidic zones ranging between ambient and pH 5, and showed that most seep derived elements are present as nanoclusters which then aggregate into larger colloids while mixing with ambient seawater along a pH gradient. Size and elemental composition of such naturally occurring nanoparticles assessed by modern characterisation methods were in good agreement with the results from conventional analytical methods. We provide analytical evidence for the presence in the water column of a large fraction of seep derived elements (e.g. approximately 50% of iron, over 80% of Mn, 100% of Cr, S and Zn) in the form of nano sized particles (e.g. <100 nm) even at typical open ocean pHs. We launch in situ sampling protocols and sample preparation procedures for multi-method suitable to obtain accurate measurements on nanoparticles from environmental samples. Based on our results a first insight to the formation of natural nanoparticles at cold CO2 seeps is presented and the persistence of such nano-clusters in the surrounding seawater is stipulated.
Lingua originaleEnglish
pagine (da-a)24-32
Numero di pagine9
RivistaMarine Chemistry
Volume140-141
Stato di pubblicazionePublished - 2012

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Chemistry(all)
  • Environmental Chemistry
  • Water Science and Technology

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