In the News Archives

October 9 2011

Columbia SRP paper in Nature Geoscience studies influence of adsorption and water demand on Arsenic migration to deep aquifers.

The Nature Geoscience paper, "Arsenic migration to deep groundwater in Bangladesh influenced by adsorption and water demand" is now released for advance online publication (9 October 2011). Kathleen Radloff, NIEHS 2009 Wetterhahn Award recipient and former Columbia SRP graduate student, is the lead author. Dr. Radloff is currently with Gradient Corporation in Cambridge, Ma. Other CU SRP authors include Yan Zheng, Martin Stute, Ben Bostick, Ivan Mihajlov, Peter Schlosser, and Alexander van Geen. Columbia's scientists worked closely on this study with their partners from Bangladesh, led by Dr. Kazi Matin Ahmed.

The paper focuses on whether deep aquifers are at risk of arsenic contamination due to high levels of arsenic in the groundwater above. The SRP-funded study injects arsenic-bearing groundwater into a deep aquifer in Bangladesh and monitors the reduction in arsenic levels over time following the withdrawal of the water. Within 24 hours, the level of arsenic was reduced by 70% in the deep aquifer zone, due to adsorption on sediments. Experimentally determined adsorption properties of sands in the deep aquifer zone and present and future scenarios of water demands were then incorporated in to a groundwater flow and transport model for the Bengal Basin by Dr. Holly Michael of the University of Delaware. Simulations show that arsenic adsorption significantly retards the transport, resulting in a lower risk of arsenic contamination in deep groundwater. The authors point out that some areas are still vulnerable to arsenic intrusion and should be monitored. To view/download the paper go online to Nature Geoscience, click here

January 1 2011

SRP selects Columbia Project to Highlight for Monthly Research Brief #193

The NIEHS SRP Research Brief #193: "Accelerating Pump-and-Treat Remediation at Arsenic-Contaminated Sites" is part of the Columbia SRP project on Mobilization of Anthropogenic Arsenic in Groundwater which Steve Chillrud heads. Other SRP scientists working on this project include Martin Stute, Brian Mailloux, and former CU graduate student, Karen Wovkulich.

If you would like to receive the Research Brief as a podcast, you can subscribe via iTunes (search Superfund Research Program), or download this one from the SRP Research Brief webpage (

January 1 2011

Columbia SRP paper selected for "NIEHS Papers of the Year" award.

The paper, "Arsenic exposure from drinking water, and all-cause chronic-disease mortalities in Bangladesh (HEALS): a prospective cohort study" appeared in The Lancet, 24-30 July. Its authors include Columbia SRP scientists: Marie Argos, Yu Chen, Faruque Parvez, Vesna Slavkovich, Alexander van Geen, Joseph Graziano, and Habibul Ahsan.

The paper is based on the SRP funded study of whether chronic and recent changes in arsenic exposure through drinking water are associated with all-cause and chronic disease mortalities in a Bangladesh population. The authors note significant associations between mortality rates and arsenic exposure through drinking water. A total of twenty-one papers were selected from across all of NIEHS for this honor.

May 21 2010

Thesis defense, "Hydrology & arsenic contamination in shallow aquifers of Bangladesh"

Zahid Aziz (C), Columbia SRP Director Joseph Graziano (R) and Associate Director Lex van Geen (L)

Zahid Aziz, Columbia SRP doctoral student and recipient of the NIH Fogarty International Center training grant, was congratulated by Columbia SRP Director Joseph Graziano and Associate Director Lex van Geen. Zahid's thesis defense, "Hydrology & arsenic contamination in shallow aquifers of Bangladesh", took place on 21 May 2010 at Lamont-Doherty Earth Observatory.


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