Sulfur and oxygen isotope tracing in zero valent iron based Insitu remediation system for metal contaminantsReport as inadecuate




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1 BRGM - Bureau de Recherches Géologiques et Minières 2 Universiteit Antwerpen Antwerpen 3 Unité Biogéochimie Environnementale BRGM - Bureau de Recherches Géologiques et Minières 4 Flemish Institute for Technological Research - VITO 5 CEREGE - Centre européen de recherche et d-enseignement de géosciences de l-environnement

Abstract : In the present study, controlled laboratory column experiments were conducted to understand the biogeochemical changes during the microbial sulfate reduction. Sulfur and oxygen isotopes of sulfate were followed during sulfate reduction in zero valent iron incubated flow through columns at a constant temperature of 20 ± 1°C for 90 d. Sulfur isotope signatures show considerable variation during biological sulfate reduction in our columns in comparison to abiotic columns where no changes were observed. The magnitude of the enrichment in delta34S values ranged from 9.4 to 10.3‰ compared to initial value of 2.3‰, having total fractionation DELTAS between biotic and abiotic columns as much as 6.1‰. Sulfur isotope fractionation was directly proportional to the sulfate reduction rates in the columns. Oxygen isotopes in this experiment seem less sensitive to microbial activities and more likely to be influenced by isotopic exchange with ambient water. A linear relationship is observed between delta34S and delta18O in biotic conditions and we also highlight a good relationship between delta34S and sulfate reduction rate in biotic columns.

Keywords : Sulfur isotopes oxygen isotopes zero valent iron in-situ remediation





Author: Naresh Kumar - Romain Millot - Fabienne Battaglia-Brunet - Philippe Négrel - Ludo Diels - Jérôme Rose - Leen Bastiaens -

Source: https://hal.archives-ouvertes.fr/



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