INVITED LECTURES AT NATIONAL AND INTERNATIONAL CONFERENCES OR WORKSHOPS:

1980: Invited lecture at the Int. Conference on Biological and Chemical Research in Marine Mesocosms, Victoria, B.C., Canada.

1981: Invited lecture at the Gordon Research Conference in Chemical Oceanography, Plymouth, N.H., USA.

1984: Invited lecture at the Int. Conference on Intractions between Sediments and Water, Geneva, Switzerland, Int. Assoc. of Sediment-Water Science.

1985: Invited lecture at the UNESCO Symposium on Comparative Ecology of Fresh Water and Coastal Marine Ecosystems, Nairobi, Kenya.

1986: Invited lecture at the 3ème Cycle Romand: Workshop on the Storage and Disposal of Domestic, Industrial and Nuclear Wastes, Neuchâtel, Switzerland.

1986: Invited lecture at the Annual ASLO/PSA Meeting in Kingston, R.I., USA.

1986: Invited lecture at the DOE Workshop on the Role of Colloids in the Transport of Trace Substances in Subsurface Waters, Manteo, N.C., USA.

1986: Invited lecture at the Conference on "Radioactivity Measurements in Switzerland after Chernobyl and their Scientific Interpretation", Berne, Switzerland.

1987: Invited lecture at the 4th Internat. Symp. on the Interaction between Sediments and Water, Melbourne, Australia, Int. Assoc. of Sediment-Water Science.

1987: Invited lecture at the Chemrawn IV, Internat. IUPAC Symp. and Workshop on Modern Chemistry and Chemical Technology Applied to the Ocean and its Resources, Denver, Colorado, USA.

1987: Invited lecture at the Swiss Conference on Radiation Physics and Biology, Bellinzona, Switzerland.

1988: Invited participant at the Radiochemistry within GOFS, Workshop organized by GOFS at WHOI, Woods Hole Oceanographic Institution, Massachusetts, USA.

1989: Invited lecture at the Texas Academy of Sciences, Annual Meeting, Beaumont, Texas, USA.

1989: Invited participant at the Workshop on Biogeochemical Pathways of Artificial Radionuclides in the Environment, Scientific Committee on Problems of the Environment, International Council of Scientific Unions, SCOPE-RADPATH, University of Essex, Colchester, U.K.

1989: Invited lecture at the 32nd IUPAC Congress, Section II, Atmospheric and Marine Chemistry, Stockholm, Sweden.

1989: Invited lecture at the 7th Internat. Conf. on Heavy Metals in the Environment, Geneva, Switzerland.

1990: Invited participant at the U.S. - Hungarian - Soviet Trilateral Science Summit, Budapest, Hungary.

1990: Invited participant at the DOE sponsored Workshop on Ocean Margins in Virginia Beach, VA.

1990: Keynote lecture in Environmental Chemistry, Italian Chemical Society Meeting in San
Benedetto del Trento, Italy.

1990: Invited participant at the Workshop on Characterization and Fate of Particles in the Environment, IUPAC International Commission on Environmental Analytical Chemistry, in Wageningen, Holland.

1991: Invited participant at the Workshop on the "The Ocean Option for Future Waste Management", WHOI, Woods Hole, Mass., USA.

1991: Invited lecture at the Second International Symposiumon the Biogeochemistry of Model
Estuaries: Estuarine Processes and Global Change, Jeckyll Island, Georgia, USA.

1991: Invited lecture at the 11th Biennial Internat. Estuarine Research Conference, San Francisco, CA, USA.

1992: Invited lecture at the International Workshop on Benthic Chambers: State of the Art and New Approaches, CISE - Milan.

1993: Invited lecture at the 205th ACS National Meeting, Div. of Geochemistry, Symposium Honoring Paul W. Schindler: Mineral/Water Interface Geochemistry, Paper 33, Denver, CO.

1993: Invited lecture at the 12th Biennial International Estuarine Research Conference, Hilton Head, South Carolin.

1994: Invited lectures at the 207th ACS National Meeting., American Chemical Society, San Diego, CA.

1995: Invited plenary lecture at the 4th International Symposium on Model Estuaries, Nantes, France.

1995: Invited plenary lecture at the 3rd International Argentum Conference, Washington, D.C.

1996: Invited lecture at the AGU/Ocean Sciences Meeting in San Diego, CA.

1996: Invited plenary lecture at the 4th International Conference on Nuclear and Radiochemistry, St. Malo, France.

1997: Invited lecture at the 214th ACS National Meeting, Las Vegas.

1997: Invited lecture at the 5th International Argentum Conference on the Transport, Fate, and Effects of Silver in the Environment. Hamilton, Ontario, Canada,

1998: Invited plenary lecture at the 8th Annual Meeting of the Society for Environmental

Toxicology and Chemistry, SETAC-Europe, Bordeaux, France.

1998: Invited plenary lecture at the 44^th International Conference on Analytical Sciences and

Spectroscopy in Kingston, Ontario, Canada.

1999: Invited lectures at University of Geneva, Switzerland, on “Environmental

Radiochemistry”.

1999: Invited lecture at the International Symposium on Isotope Techniques in Water Resources Development and Management, IAEA-SM-361, Vienna, Austria.

1999: Invited participant at the International Argentum VI Conference and Workshop in Madison, Wisconsin.

1999: Invited lecture at the International Conference of the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) and 45th International Conference on Analytical Sciences and Spectroscopy (ICASS) in Vancouver, Canada.

2000: Invited lecture, chairman, and convenor of session, American Society of Limnology and Oceanography, ASLO-2000, Copenhagen, Denmark.

2000: Invited lecture, International Conference on Analytical Sciences and Spectroscopy (ICASS) in Winnipeg, Canada.

2000: Invited lecture, 5^th International Conference on Nuclear and Radiochemistry, Pontresina, Switzerland.

2001. Invited lecture, Galveston Bay National Estuary Symposium V “State of the Bay”, Jan. Galveston, TX.

2001. International Symposium on Actinides-2001 in Hayama, Japan.

2002: AGU/ASLO Aquatic Sciences meeting in Honolulu, Hawaii.

2002: Invited seminar at Tulane University, New Orleans, LA.

2002: Invited lecture at the EURESCO – Natural Waters and Water Technology Conference on Aquatic Colloids in Spa, Belgium.

2003: EGS-AGU-EUG Joint Assembly, Nice, France.

2003: Invited participant and chairman of “WG8 – Tracers of particle dynamics and carbon flux” working group at the GEOSECS - II – International GEOTRACES planning workshop, Toulouse, France (13-16 April, 2003).

2003: Invited seminars at University of Bern, Dept. of Chemistry, Bern, Switzerland.

2003: Invited seminar at University of Geneva, Dept. of Chemistry, Geneva, Switzerland.

2003: Invited seminar at EAWAG, Swiss Institute of Technology, Zurich, Switzerland.

2003: Invited seminar at Southwest Research Institute, San Antonio, Texas.

2003: Invited lecture, Workshop on Flocculation in Natural and Engineered Environmental Processes, Canada Center for Inland Waters, Burlington, Ontario, Canada.

2003: Invited talk at Gel Workshop, Centennial FHL Symposium on Global Biogeochemical Cycles: A tribute to Prof. John I. Hedges, Friday Harbor Laboratory, University of Washington.

2003: Invited lecture, NSF Nanoscale Science and Engineering Grantees Conference. National Science Foundation, Arlington, Virginia.

2004: Lecture at ASLO 2004 Ocean Research Conference, Honolulu, Hawaii.

2004: Invited lecture and chairman of session, ACS National Meeting, Anaheim, CA.

2004: Invited plenary lecture at 8^th International Estuarine biogeochemistry Symposium in Solomons, MD.

2004: Convenor, chairman of session, and presenter, at the International Goldschmidt 2004 Conference in Copenhagen, Denmark.

2004: Invited participant at the International Conference on Aquatic Colloids, University of Birmingham, UK.

2004: Invited lecture at University of Lancaster, UK.

2005: Session chairman, and invited presentation at the ASLO 2005 Aquatic Sciences Meeting, Salt Lake City, Utah, USA.

2005: Invited presentation at the Chemical Oceanography Gordon Conference, Tilton, NH, USA.

2005: Presentation at Migration’05, the 10^th International Conference on Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, in Avignon, France.

2006: Invited member to the International Audit Team for the Laboratory for Radiochemistry and Environmental Chemistry of the Paul Scherrer Institute and the University of Bern, Switzerland.

2006: Invited Presentation at the Second International Conference on Natural Aquatic Colloids and Nanoparticles, at the University of Plymouth, U.K.

2007: Session co-chairman and presentation at the SLO 2007 Aquatic Sciences Meeting, Santa Fe, New Mexico, USA.

2007: Invited Presentation and participant for the workshop "Basic Research Needs for Geosciences: Facilitating 21st Century Energy Systems," BRN Geosciences Nuclear Panel “Scientific Challenges for Stewardship of Nuclear Wastes from Present and Future Generation Technologies”, organized by the Office of Basic Energy Sciences of the Department of Energy, Washington, DC.