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  • Professor
  • Environmental Geochemistry and Biogeochemistry
   
Degrees
  • Ph.D. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA.
    • Title: Biogeochemical Dynamics in Aquatic Sediments: Novel Laboratory and Field-Based Approaches.
    • Minor: Environmental Engineering.
  • Interdisciplinary Certificate in Geohydrology, Georgia Institute of Technology, Atlanta, GA.
  • Master of Science and Technology, Applied Geology, Indian School of Mines, Dhanbad, India.
  • Bachelor of Science, Holker Science College, Indore, India.
Employment
  • Professor, Department of Geology, Geography and Environmental Studies, University of Stellenbosch, Stellenbosch, 7602, South Africa (09/08 - present)
  • Senior Lecturer, Department of Geological Sciences, University of Cape Town, Rondebosch, 7700, South Africa (07/01 - 08/08)
  • Visiting professor, University of Paris VII - Denis Diderot, Paris, France (Spring 2003)
  • Lecturer, Environmental Sciences Program, Weinburg college of arts and science, Northwestern University, Evanston, IL, 60208, USA (01/99 - 06/01).
Activities and Honours
  • Associate Editor, Applied Geochemistry
  • Council Member: International Association of GeoChemistry (Aug 2004 - July 2008)
  • Fellow, International Congress of Chemistry and Environment
  • Founder Member, AEON (Africa Earth Observatory Network)
  • Board Member, MA-RE (Marine Research Institute, UCT), 2006 -
  • Associate Member, Institute for Microbial Biotechnology and Metagenomics; University of the Western Cape, 2007 -
  • Member Geochemical Society
  • Listed in Marquis Who's Who in Science and Engineering, 7th Edition, 2003
  • 1st position in order of Merit in Bachelor of Science, Holker Science College, India.
  • 2nd position in order of Merit in Master of Science and Technology, Indian School of Mines, India.
  • C.S. Kiang award for best graduate student research, 1996, EAS, Georgia Institute of Technology, Atlanta.
  • Best Teaching Assistant, 1997, EAS, Georgia Institute of Technology, Atlanta.
  • Senator, Graduate Student Association, Georgia Institute of Technology, Atlanta.
  • Executive member, Student Union, Holker Science College, India.

Currently Funded Projects
  • Roychoudhury AN (2007 - 2009) Biogeochemistry of the Southern Ocean: interactions between nutrients, dynamics, and ecosystem structure. SANAP, R764,500
  • Roychoudhury AN (2006 – 2008) Biogeochemical cycle of silica in the Central Benguela Upwelling System: Dissolution kinetics and flux measurements. NRF, R494,000
  • Roychoudhury AN and Colvin, C (2006-2008) Biogeochemical controls on the plant biodiversity within a saltmarsh ecosystem in the West Coast National Park: Impact of saltwater-groundwater interaction on porewater chemistry and vegetation. WRC,R398,400
  • Roychoudhury AN and Land, M (2006) Environmental change and Biogeochemical Cycle of Silica in the Central Benguela Upwelling System: Silica dissolution kinetics, flux and isotope measurements. NRF-SIDA Planning Grant SKr 75,000
  • Roychoudhury AN and Cowan, D (2005 – 2008) An integrated geochemical and microbiological study of dissimilatory sulphate reduction in extreme environments with a special emphasis on hypersaline systems. NRF,R360,000
I also have interests in the following subject areas
  • Biofouling: Dynamics of iron in water wells
  • Life in Extreme Environments
  • Nutrient and Metal Cycling in Aquatic Environments
  • Plug Flow-through Reactors and Kinetics of Biogeochemical Reactions

Information coming soon (08-12-2008)
 
D. Porter, A. N. Roychoudhury and D. Cowan (In review) Dissimilatory Sulfate Reduction in Hypersaline Coastal Pans: Temperature dependence and kinetic considerations. Geobiology
 
D. Porter, D. Cowan and A. N. Roychoudhury (In review) An integrated microbiological and geochemical study of sulfate reduction in hypersaline pans. Microbial Ecology
 
S. Staniland, A. N. Roychoudhury and D. Cowan (In review) Cobalt uptake and resistance to trace metals in Comamonas testosterone isolated from heavy-metal contaminated sites in the Zambian Copperbelt. Geomicrobiology Journal
 
A. Sako, A. Mills and A. N. Roychoudhury (In review) Rare earth and trace element geochemistry of termite mounds in central and northeastern Namibia: mechanisms for micro-nutrient accumulation. Geoderma
 
A. Sako, J. Petersen and A. N. Roychoudhury (In review) Geochemical evaluation of soils and groundwater affected by infiltrating effluent from evaporation ponds of a heavy mineral processing facility, West Coast, South Africa. Applied Geochemistry
 
A. Sako, L. Lopez and A. N. Roychoudhury (2008) Adsorption and surface complexation modeling of palladium, rhodium and platinum in surficial semi-arid soils and sediment. Applied Geochemistry, doi:10.1016/j.apgeochem.2008.11.005
 
S. Das, J. Routh, and A. N. Roychoudhury (2008) Sources and historic changes in polycyclic aromatic hydrocarbons input in a shallow lake, Zeekoevlei, South Africa. Organic Geochemistry. V. 39, pp 1109-1112. doi: 10.1016/j.orggeochem.2008.04.005
 
S. Das, J. Routh, and A. N. Roychoudhury (2008) Biomarker evidences of macrophyte and plankton community changes in a shallow lake, Zeekoevlei, South Africa. Journal of Paleolimnology doi: 10.1007/s10933-008-9241-3
 
S. Das, J. Routh, A. N. Roychoudhury and J. V. Klump (2008) Phosphorus dynamics in shallow eutrophic lakes: an example from Zeekoevlei, South Africa. Hydrobiologia doi: 10.1007/s10750-008-9600-0
 
S. Das, J. Routh, A. N. Roychoudhury and J. V. Klump (2008) Provenance and depositional history of trace metals, major ions and organic matter in Zeekoevlei: an urban lake in South Africa. Applied Geochemistry
 
S. Das, J. Routh, A. N. Roychoudhury and J. V. Klump (2008) Elemental ratios (C/N, H/C) and stable isotope (d15N and d13C) signatures in sediments from Zeekoevlei, South Africa – A record of human intervention into the lake. Journal of Palaeolimnology. Doi: 10.1007/s10933-007-9110-5
 
A. N. Roychoudhury (2007) Spatial and seasonal variations in depth profiles of trace metals in saltmarsh sediments from Sapelo Island, Georgia USA. Estuarine, Coastal and Shelf Science. Vol 72(4) pp 675-689. doi: 10.1016/j.ecss.2006.12.003
 
D. Porter, A. N. Roychoudhury and D. Cowan (2007) Dissimilatory Sulfate Reduction in Hypersaline Coastal Pans: Activity Across a Salinity Gradient. Geochimica et Cosmochimica Acta doi: 10.1016/j.gca.2007.08.023
 
A. N. Roychoudhury and D. W. McCormick (2006) Kinetics of sulphate reduction in a coastal aquifer contaminated with petroleum hydrocarbons. Biogeochemistry V81(1), pp 17-31. doi: 10.1007/s10533-006-9027-5.
 
A. N. Roychoudhury and M. Starke (2006) Partitioning and mobility of trace metals in the Blesbokspruit: Impact of mining in the East Rand, South Africa. Applied Geochemistry V. 21(6) pp 1044-1063. doi: 10.1016/j.apgeochem.2006.02.024.
 
A. N. Roychoudhury and G. L. Merrett (2006) Redox Pathways in a Petroleum Contaminated Shallow Sandy Aquifer: Iron and Sulfate Reduction. Science of the total Environment V. 366(1) pp 262-274. doi: 10.1016/j.scitotenv.2005.10.024
 
A. N. Roychoudhury (2006) Time Dependent Calibration of a Sediment Extraction Scheme. Marine Pollution Bulletin.V. 52(4), pp. 397-403. doi: 10.1016/j.marpolbul.2005.09.033
 
G. L. Merrett and A. N. Roychoudhury (2005) Anaerobic degradation of hydrocarbon compounds in a petroleum contaminated aquifer. In Govil, P. K. (Ed.,) Soil and Groundwater Contamination: Risk Assessment and Remedial Measures. National Geophysical Research Institute, Hyderabad, India, pp. 1-14
 
P.M.S. Monteiro and A. N. Roychoudhury (2005) Spatial characteristics of sediment trace metals in an eastern boundary upwelling retention area (St. Helena Bay , South Africa): A hydrodynamic-biological pump hypothesis. Estuarine, Coastal & Shelf Sci., V 65 (1-2), pp. 123-134. doi: 10.1016/j.ecss.2005.05.013
 
C. Koretsky, P. Van Cappellen, T DiChristina, J. Kostka, C. Moor, A. N. Roychoudhury, E. Viollier (2005) Saltmarsh pore water geochemistry does not correlate with micorbial community structure. Estuarine, Coastal & Shelf Sci., V62(1-2), pp. 233-251.doi: 10.1016/j.ecss.2004.09.001
 
A. N. Roychoudhury (2004) Sulfate metabolism among thermophiles and hyperthermophiles in aquatic sediments. Biochem. Soc. Transac., V32(2), pp. 172 - 174.
 
A. N. Roychoudhury (2004) Sulfate respiration in extreme environments: A kinetic study. Geomicrobiology Journal, V21(1), pp. 33-43. doi: 10.1080/01490490253446
 
P. Inglett, E. Viollier, A. N. Roychoudhury, and P. Van Cappellen (2004) A new idea in marsh coring: The wedge. Soil Sc. Soc. Am. J., V 68(2), pp. 705-708.
 
A. N. Roychoudhury, J. Kostka, and P. Van Cappellen (2003) Pyritization: A palaeoenvironmental and redox proxy reevaluated. Estuarine, Coastal & Shelf Sci., V 57(5-6), pp. 1183-1193. doi: 10.1016/S0272-7714(03)00058-1
 
A. N. Roychoudhury, P. Van Cappellen, J. Kostka, and E. Viollier (2003) Kinetics of microbially mediated reactions: Dissimilatory sulfate reduction in saltmarsh sediments (Sapelo Island, Georgia, USA), Estuarine, Coastal & Shelf Sci., V56(5-6), pp 1001-1010. doi: 10.1016/S0272-7714(02)00325-6
 
Kostka, A. N. Roychoudhury, and P. Van Cappellen (2002) Rates and controls of anaerobic microbial respiration across spatial and temporal gradients in saltmarsh sediments. Biogeochemistry V60(1), pp. 49 - 76.
 
A. N. Roychoudhury, (2001) Dispersion in unconsolidated aquatic sediments. Estuarine, Coastal & Shelf Sci., V 53(5), pp. 745-757.
 
E. Viollier, P. Inglett, K. Hunter, A. N. Roychoudhury, and P. Van Cappellen (2000) The ferrozine method revisited: Fe(II)/Fe(III) determination in natural waters. Applied Geochem., V. 15, pp. 785-790.
 
K. L. Lowe, T. J. DiChristina, A. N. Roychoudhury, and P. Van Cappellen (2000) Microbiological and geochemical characterization of microbial Fe(III) reduction in saltmarsh sediments. Geomicorbiol. J., V. 17, pp. 163-178.
 
A. N. Roychoudhury, E. Viollier, and P. Van Cappellen (1998) A plug flow-through reactor for studying biogeochemical reactions in undisturbed aquatic sediments. Applied Geochem., V. 13, pp. 269-280
 
P. Van Cappellen, E. Viollier, and A. N. Roychoudhury, (1998). Biogeochemical cycles of manganese and iron at the oxic-anoxic transition of a stratified marine basin (Orca basin, Gulf of Mexico). Env. Sc. & Tech., V. 32(19), pp. 2931- 2939.
 
A. N. Roychoudhury and P. Van Cappellen (1996) A flow-through reactor for extracting kinetics of biogeochemical reactions from intact sediments. In (Editor S. H. Bottrell) Geochemistry of the Earth's Surface, . pp. 633-637