Liquid chromatography–high-resolution mass spectrometry for identifying aqueous chlordecone hydrate dechlorinated transformation products formed by reaction with zero-valent iron

Hanane Belghit 1 Cyril Colas 2, 3 Sébastien Bristeau 1 Christophe Mouvet 1 Benoît Maunit 2
1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 ICOA - Institut de Chimie Organique et Analytique
3 CBM - Centre de biophysique moléculaire
Abstract : Chlordecone (CLD) is a persistent toxic chlorinated pesticide which contaminates different ecosystems in French West Indies. A soil remediation process including zero-valent iron (ZVI) has produced promising results but failed to completely degrade CLD, and the analytical procedures used yielded little information on the transformation products. To fill these gaps, dechlorination of aqueous CLD by micrometric particles of ZVI has been investigated. Aliquots of water with 25% (v/v) of acetone spiked with 100 ppm CLD were taken at different times during a 30-day ZVI treatment and directly analysed by ultra-high-performance liquid chromatography in negative electrospray ionisation mode. CLD has been totally transformed after 14 days into 14 dechlorinated degradation products, including 9 isomeric compounds. The maximum chloride concentrations appearing in the medium represent 44% of that which would result from total dechlorination of CLD. The CLD transformation products identified by accurate mass measurements on an ultra-high-resolution Q-TOF mass spectrometer (Q-TOF-MS) were C10H3Cl9O2, C10H4Cl8O2, C10H5Cl7O2, C10H6Cl6O2 and C10H7Cl5O2. The results show the interest of LC-Q-TOF-MS for identifying transformation products of organic contaminants, and the effectiveness of micrometric ZVI particles to totally transform CLD into less chlorinated products.
Keywords : chlordecone Kepone reductive dechlorination zero-valent iron remediation ultra-high-resolution Q-TOF mass spectrometer
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Article dans une revue
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https://hal-brgm.archives-ouvertes.fr/hal-01398985
Contributeur : Anne-Marie Pouget <>
Soumis le : vendredi 18 novembre 2016 - 10:24:43
Dernière modification le : mardi 10 juillet 2018 - 13:24:01

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Hanane Belghit, Cyril Colas, Sébastien Bristeau, Christophe Mouvet, Benoît Maunit. Liquid chromatography–high-resolution mass spectrometry for identifying aqueous chlordecone hydrate dechlorinated transformation products formed by reaction with zero-valent iron. International Journal of Environmental Analytical Chemistry, Taylor & Francis, 2015, 95 (2), ⟨10.1080/03067319.2014.994615 ⟩. ⟨hal-01398985⟩

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