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Direct Fluorescence Monitoring of Coal Organic Matter Released in Seawater

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Abstract

Whenever immersed in seawater after a collier accident, a fossil fuel such as coal could become a source of pollution to the marine environment. To study the effect of such a contamination, four coal samples from different origins were used. A first analysis on those coals enabled us to determine the content of polycylic aromatic hydrocarbons. Seawater was then mixed with coal to study the organic matter released from coal into seawater. Fluorescence was used for its sensitivity to aromatic compounds, with the additional purpose of evaluating the relevance of using an immerse fluorescence probe to monitor water pollution. Excitation–emission matrices were recorded and the excitation–emission wavelength range corresponding to the highest fluorescence intensity was 230 nm/[370 nm; 420 nm]. The samples with coal happened to fluoresce more than the coal-free samples, the difference depending on the coal origin. The fluorescence intensity increased with coal mass, up to some limit. The particle size also influenced the fluorescence intensity, the finest particles releasing more fluorescing substances, due to their higher exchange surface. When seawater percolated through coal, the samples fluoresced highly at the beginning, and then the fluorescence intensity decreased and reached the seawater level. However, even with a 10 ns acquisition time shift, the fluorescence spectra were not specific enough to show the presence of PAHs in the samples, which were too diluted to be detected, whenever released from coal into seawater. The lifetimes of the seawater and of the coal samples were respectively 4.7 and 3.8 ns, indicating that the substances released from coal mainly consisted of short-lived fluorescing substances, such as natural humic or fulvic substances. Consequently, the presence of coal does not seem to be too detrimental to the marine environment, and a direct fluorescence probe could be used to monitor the seawater organic charge increase due to the immersion of coal in seawater.

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Authors and Affiliations

  1. Chemistry Department, University of Brest, Brest, France

    C. Jaffrennou, L. Stephan, P. Giamarchi, J. Y. Cabon & L. Burel-Deschamps

  2. Coal Department, Total Gas and Power France, Paris, France

    F. Bautin

Authors
  1. C. Jaffrennou
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  2. L. Stephan
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  3. P. Giamarchi
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  4. J. Y. Cabon
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  5. L. Burel-Deschamps
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  6. F. Bautin
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Correspondence to C. Jaffrennou.

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Jaffrennou, C., Stephan, L., Giamarchi, P. et al. Direct Fluorescence Monitoring of Coal Organic Matter Released in Seawater. J Fluoresc 17, 564–572 (2007). https://doi.org/10.1007/s10895-007-0216-y

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  • DOI: https://doi.org/10.1007/s10895-007-0216-y

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