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Silver enhancement of tissue mercury: demonstration of mercury in autometallographic silver grains from rat kidneys

JO Norgaard, B Moller-Madsen, N Hertel and G Danscher

Department of Cell Biology, University of Aarhus, Denmark.

The autometallographic silver enhancement method has been applied increasingly to detect trace amounts of mercury in preparations of biological tissue. It has, however, been difficult to establish the presence of a core of mercury within the silver grain by direct methods such as energy dispersive X-ray analysis. In the present work, a sample of autometallographic silver grains was prepared from kidneys of rats exposed to mercury in the drinking water. Frozen sections from the kidneys were silver-enhanced and subsequently all organic material was removed by enzymatic digestion. The remaining pellet of silver grains was analyzed by proton-induced X-ray emission (PIXE) and mercury was demonstrated in an amount of 0.1-0.5% compared to silver. In addition, it was demonstrated that two pools of catalytic mercury compounds exist, probably corresponding to sulfide- and selenium-bound mercury.

Volume 37, Issue 10, pp. 1545-1547, 10/01/1989
Copyright © 1989 by The Histochemical Society


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