|CU SRP scientists Lex van Geen and Ben Bostick, Charlie Harvey (MIT), and Dr. P. T. K. Trang from CETASD/Hanoi University of Science.|
New York Times article, Arsenic Contamination Threatens Water in Hanoi, by Donald G. McNeil, Jr. highlights the September Nature publication led by CU SRP scientists Lex van Geen and Ben Bostick along with Charles Harvey (MIT) and their Vietnamese colleagues, including Dr. P. T. K. Trang from CETASD/Hanoi University of Science. Their research indicates that while arsenic is leaching into an aquifer that serves as drinking-water for Hanoi, the speed of contamination may be delayed due to retardation of arsenic transport in the Pleistocene aquifer.
Nature published on September 11, 2013 a paper by CU SRP scientists Alexander van Geen, Benjamin Bostik, Kathleen Radloff, Zahid Aziz, and Jacob L. Mey on "Retardation of arsenic transport through a Pleistocene aquifer". Here they present findings from their study on the contamination of a Pleistocene aquifer near Hanoi, Vietnam. Their study reveals that "changes in groundwater flow conditions and the redox state of the aquifer sands induced by groundwater pumping caused the lateral intrusion of arsenic contamination more than 120 metres from a Holocene aquifer into a previously uncontaminated Pleistocene aquifer.We also find that arsenic adsorbs onto the aquifer sands and that there is a 16–20-fold retardation in the extent of the contamination relative to the reconstructed lateral movement of groundwater over the same period. Our findings suggest that arsenic contamination of Pleistocene aquifers in south and southeast Asia as a consequence of increasing levels of groundwater pumping may have been delayed by the retardation of arsenic transport."
The research presented here was fund by the US National Science Foundation and the NIEHS Superfund Research Program.
Additional authors include Vi Mai Lan, Nguyen-Ngoc Mai, Phu Dao Manh and Pham Hung Viet, of the Hanoi University of Science, Mason Stahl and Charles Harvey from MIT, Beth Weinman from Vanderbilt University along with researchers from Anchor QEA, Eawag Swiss Federal Institute of Aquatic Science and Technology,Institute of Geochemistry and Petrology, Swiss Federal Institute of Technology.
van Geen, A., Bostick, B., Thi Kim Trang, P., et al. 2013. Retardation of arsenic transport through a Pleistocene aquifer. Nature 501, 204–207 doi:10.1038/nature12444 (onine 12 September 2013).