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Holger Hintelmann
Associate Professor
Trent University, Department of Chemistry, 1600 West Bank Drive, Peterborough K9j 7B8 Canada
+1 (705) 748 1011 x 1659
+1 (705) 748 1625
Holger Hintelmann
Currently, we are investigating the availability of mercury species in the aquatic environment. Using stable isotopes of mercury we are able to measure the methylation of mercury(II) and the demethylation of monomethylmercury simultaneously in a variety  of aquatic samples. Analysis of mercury species is accomplished after gas chromatographic separation by inductively coupled plasma mass spectrometry (GC/ICP-MS). Our group is also a participant of METALLICUS (Mercury experiment To Assess Lake Loading In Canada and the United States). Here we are using stable isotopes of mercury in the field to evaluate the contribution of atmospherically deposited mercury to the overall levels of methylmercury observed in fish. This experiment is carried out at the ELA (Experimental Lakes Area) in Ontario. On a related subject we are investigating the accuracy of various methods used for monomethylmercury analysis. Recent collaborative work with Dr. R.-D. Wilken from the ESWE Institute , Germany, has demonstrated that especially sediments are prone to artifactual formation of monomethylmercury during sample preparation. The apparent measured  concentration can be corrected for this artifactual formation applying species-specific isotope addition (SSIA).
Another project studies the interaction of metals with dissolved organic material (DOC). Of special interest to us is DOC as a ligand controlling the availability of metals in aquatic systems. The main task at the moment is to develop a more holistic method to characterize DOC using LC-MS techniques.
Finally, we are in the process of developing a mass balance model describing the fate of heavy metals in contaminated lakes.
As a member of Trent University¹s Institute of Mass spectrometry (TUIMS) we have access to a variety of state of the art analytical equipment, including:
  • Collision cell ICP-MS
  • LC/MS
  • LC/MS-MS
  • CE

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