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Sedlazeck, K.P., D. Vollprecht, P. Muller, R. Mischitz, and R. Giere.
Environmental Science and Pollution Research [Published online 14 January 2020 prior to print]

The latest groundwater monitoring results are presented from a field project that is testing a combined pump and treat method with in situ reduction Cr(VI) at an abandoned site in Austria. The reducing agent sodium dithionite was injected underground in two hotspots to reduce Cr(VI) to Cr(III) using different injection strategies. Throughout the treatment, part of the Cr(VI) was mobilized and not instantly reduced. To prevent further spreading of the mobilized Cr(VI), the pump and treat method, which used zero-valent iron, was installed downgradient of the hot spots. Based on the groundwater sample analyses, it was possible to distinguish different remediation phases, characterized by excess chromate and excess sulfite. During the excess sulfite conditions, Cr(VI) was successfully removed from the system, but after terminating the sodium dithionite injection, the Cr(VI) rebounded.

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