Primary tabs


No longer at LDEO: 
Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
61 Route 9W - PO Box 1000
(845) 365-8155


Fields of interest: 
Environmental and Analytical Geochemistry

My research interests are on environmental trace metals, in particular arsenic (As) and lead (Pb). These include analytical methods for trace elements, isotopes and aqueous speciations, application of low level toxic metals detection in geochemical, environmental and health research, environmental chemistry and geochemistry of arsenic and lead, remediation technology and strategies for toxic metals in aqueous environments. I am also broadly interested in environmental, climatic and geologic problems where radiogenic and radioactive isotope tracers and dating techniques are applied.

List of degrees from highest to lowest:
The Ohio State University
Honors & Awards: 
Outstanding Student Paper Award, Geological Society of America 1998
Spieker Book Award, The Ohio State University 2000
Professional Development Fund, The Ohio State University 2000

Selected Publications:

Limited temporal variability of arsenic concentrations in 20 wells monitored for 3 years in Araihazar, Bangladesh Cheng, Z.; Van Geen, A.; Seddique, A. A.; Ahmed, K. M. Environmental Science & Technology Jul 1 Volume: 39 Issue: 13 p.: 4759-4766 (2005) Doi 10.1021/Es048065f
Reliability of a commercial kit to test groundwater for arsenic in Bangladesh Van Geen, A.; Cheng, Z.; Seddique, A. A.; Hoque, M. A.; Gelman, A.; Graziano, J. H.; Ahsan, H.; Parvez, F.; Ahmed, K. M. Environmental Science & Technology Jan 1 Volume: 39 Issue: 1 p.: 299-303 (2005) Doi 10.1021/Es0491073
Removal of methylated arsenic in groundwater with iron filings Cheng, Z. Q.; Van Geen, A.; Louis, R.; Nikolaidis, N.; Bailey, R. Environmental Science & Technology Oct 1 Volume: 39 Issue: 19 p.: 7662-7666 (2005) Doi 10.1021/Es050429w